Unthreaded Nylon Spacers & Plastic Tubular Spacers: Engineering Selection and OEM Sourcing Guide

Unthreaded nylon spacers and plastic tubular spacers are used to establish controlled physical separation between circuit boards, 

electronic modules, faceplates, brackets, switchgear components, sensors, covers, and equipment chassis.

Unlike threaded standoffs, an unthreaded tubular spacer does not normally provide its own threaded fastening interface. Instead, a screw, bolt, stud, rivet, 

or alignment feature passes through the spacer's central bore while the spacer establishes the required distance between mating components.

This apparently simple architecture makes unthreaded spacers useful across electronics, electrical equipment, switchgear, semiconductor equipment, 

AI servers, telecommunications, lighting, industrial automation, medical equipment, renewable energy systems, automotive electronics, instrumentation, and other OEM assemblies.

However, spacer selection involves more than specifying a nominal length.

A plastic spacer becomes part of the complete assembly stack and can influence:

• component spacing

• screw or bolt clearance

• alignment

• bearing area

• compressive load transfer

• clamp-load behavior

• electrical separation

• thermal conduction

• thermal expansion

• moisture-related dimensional change

• creep and stress relaxation

• PCB or panel deflection

• tolerance accumulation

For this reason, a reliable engineering sequence is:

Required Component Separation → Spacer Length → ID → OD → Fastener → Bearing Interface → Material → Clamp Load → Environment → Tolerance Stack-Up → Validation

Juxin Fasteners supplies standard and custom unthreaded nylon spacers, plastic tubular spacers, spacer sleeves, insulating mounting pillars, 

threaded standoffs, PCB supports, nylon washers, nylon screws, and drawing-based molded plastic components for industrial OEM applications.

Engineering and procurement teams can submit an existing manufacturer part number, physical sample, 2D drawing, 3D CAD model, 

ID/OD/length requirements, mating fastener information, assembly stack, material specification, or operating conditions for technical and commercial evaluation.

What Is an Unthreaded Nylon Spacer?

An unthreaded nylon spacer is generally a tubular component with:

• an inside diameter

• an outside diameter

• a defined length

• no functional internal thread

The central bore allows a fastener or locating feature to pass through.

The spacer body maintains separation between the surrounding components.

A simplified assembly may be:

Screw Head → Upper Component → Spacer → Lower Component → Nut

or:

Screw → PCB → Spacer → Chassis Thread

The spacer establishes distance while the separate fastener provides retention.

This distinction is fundamental.

Spacer = Controls Distance

Fastener = Creates Retention

In some assemblies, the same component may perform multiple functions, but those functions should be identified explicitly during design.

Unthreaded Spacer vs. Threaded Standoff

The terms “spacer” and “standoff” are often used interchangeably in commercial searches, but they can describe different fastening architectures.

Unthreaded Spacer

Provides a through-hole and normally relies on a separate fastener passing through it.

Threaded Standoff

Provides an internal thread, external thread, or male-female threaded configuration and can become part of the fastening system itself.

This distinction matters when selecting:

• fastener length

• assembly sequence

• serviceability

• torque path

• component stack

• tooling access

If a pass-through screw is required, an unthreaded tubular spacer may be the simpler architecture.

If components must be independently attached at each end, a threaded standoff may be more appropriate.

Core Design Variations and Tubular Configurations

Selecting the correct plastic spacer requires evaluating its geometry together with the assembly stack.

Round Tubular Nylon Spacers

Round tubular spacers use a cylindrical OD with a central through-hole.

They are commonly used for:

• PCB spacing

• electronic modules

• equipment panels

• control systems

• sensors

• brackets

• covers

• lighting assemblies

Round geometry provides a compact and straightforward spacing solution where no anti-rotation outer profile is required.

Hexagonal Plastic Spacers

Hexagonal outer profiles can provide additional external surfaces for:

• manual positioning

• tooling

• anti-rotation features

• assembly handling

However, an unthreaded hex spacer should not automatically be assumed to require wrench tightening.

If the spacer is only a pass-through sleeve, tightening torque is still carried through the complete joint rather than through an internal spacer thread.

Square and Rectangular Plastic Spacers

Square or rectangular spacer geometries may be used where the assembly requires:

• anti-rotation

• increased contact area

• orientation control

• packaging within rectangular equipment geometry

• integration with channels or molded pockets

The geometry should follow the actual mechanical interface.

Flanged Spacers

A spacer may incorporate an integral flange at one or both ends.

The flange can provide:

• increased bearing area

• location

• retention

• surface separation

• assembly orientation

A flange can change the way compressive load is transferred into the mating component and should therefore be included in stack-up calculations.

Stepped Spacers

Custom spacers can incorporate multiple diameters or shoulders.

These designs may combine:

• spacing

• centering

• hole location

• panel separation

• anti-movement functions

Stepped geometry is particularly useful where a standard straight tube does not control the assembly adequately.

Spacer Sleeves and Bushings: Similar Geometry, Different Function

A tubular plastic component may be described as a:

• spacer

• sleeve

• bushing

• insulating sleeve

• mounting pillar

The geometry may appear similar, but the engineering function can differ.

A spacer primarily controls axial distance.

A bushing may primarily support, guide, isolate, or protect a shaft or fastener through a hole.

Therefore:

Part Name Alone ≠ Functional Specification

Engineers and procurement teams should evaluate the actual dimensions and assembly role.

The Three Primary Spacer Dimensions: ID, OD and Length

Most unthreaded tubular spacers are fundamentally controlled by:

ID = Inside Diameter

OD = Outside Diameter

L = Length

These three dimensions interact.

Changing one can affect:

• wall thickness

• stiffness

• fastener clearance

• bearing area

• compressive behavior

• packaging space

• dimensional tolerance

Inside Diameter: Fastener Clearance

The spacer ID must accommodate the actual pass-through fastener.

This may include:

• machine screw

• bolt

• threaded stud

• rivet

• locating pin

The correct ID depends on more than nominal fastener diameter.

Relevant factors can include:

• actual shank diameter

• fastener tolerance

• spacer ID tolerance

• coating

• alignment

• assembly method

• thermal expansion

• required movement

If the ID is too small, the fastener may bind.

If it is unnecessarily large, the assembly may lose centering accuracy or allow unwanted lateral movement.

Nominal Screw Size Does Not Define Spacer ID

An “M4 nylon spacer” does not necessarily require a 4.00 mm bore.

The spacer normally requires clearance around the actual fastener.

Therefore, engineering teams should specify the required ID or mating screw rather than relying only on nominal size descriptions.

The same principle applies to Unified fastener systems.

Outside Diameter: Bearing Area and Packaging

Spacer OD influences both structural and packaging behavior.

A larger OD can provide:

• increased wall thickness

• greater bearing area

• potentially greater resistance to local compression

However, it also consumes more assembly space.

In dense electronic equipment, excessive OD may interfere with:

• PCB components

• solder joints

• connectors

• heat sinks

• busbars

• cable routes

• enclosure walls

• adjacent fasteners

Therefore:

Larger OD ≠ Automatically Better Spacer

OD should be selected according to the mechanical load and available envelope.

Wall Thickness

For a simple tubular spacer:

Wall Thickness ≈ (OD − ID) / 2

Wall thickness influences:

• stiffness

• local stability

• molding behavior

• compressive response

• resistance to splitting

• available bearing area

A thin-wall spacer may be adequate for a lightly loaded electronic assembly but unsuitable for a more highly compressed joint.

The correct geometry depends on material and load.

Spacer Length Controls Assembly Separation

Spacer length is normally the most functionally visible dimension because it establishes the nominal distance between components.

However:

Spacer Length ≠ Automatically Final Installed Separation

The final installed distance can also depend on:

• spacer compression

• mating-surface flatness

• component thickness

• washers

• coatings

• PCB deflection

• fastener preload

• dimensional tolerances

• temperature

• moisture

This distinction becomes important in precision assemblies.

Nominal Spacer Length vs. Installed Spacer Length

A spacer may have a nominal free-state length before assembly.

After tightening, its effective installed length may change depending on the compressive load and polymer behavior.

For applications where the spacing dimension controls:

• connector alignment

• optical alignment

• board-to-board spacing

• sensor position

• enclosure clearance

• thermal gap

engineers should validate the installed assembly rather than relying only on the free-state spacer dimension.

Tolerance Stack-Up: Why Spacer Length Cannot Be Evaluated Alone

Consider a simplified electronic assembly:

Top Cover → Washer → PCB → Spacer → Lower PCB → Chassis

The final location of the upper component depends on every dimension in the stack.

A simplified dimensional relationship may be expressed as:

Assembly Stack = Component Thicknesses + Spacer Lengths + Washer Thicknesses + Interface Conditions

Each component also has a tolerance.

If several dimensions accumulate in the same direction, the final assembly can move outside the intended range.

Therefore, spacer tolerance should be evaluated within the complete tolerance stack.

Worst-Case vs. Statistical Stack-Up

For critical assemblies, engineering teams may evaluate tolerance accumulation using a worst-case or statistical method appropriate to the design and manufacturing process.

The spacer supplier should not determine the customer's complete tolerance strategy.

However, the spacer's:

• length tolerance

• ID tolerance

• OD tolerance

• molding variation

• environmental dimensional behavior

should be known where these parameters affect the assembly.

PCB Spacing Requires More Than Spacer Length

In PCB assemblies, a spacer can control board separation, but the final geometry may also be affected by:

• PCB thickness

• board flatness

• screw locations

• connector geometry

• component height

• board deflection

• tightening sequence

This becomes increasingly important for large PCBs and multi-point mounting arrays.

Compressive Load Path

When a screw or bolt passes through a spacer and is tightened, the spacer can become part of the compressive load path.

A simplified joint may be:

Screw Head → PCB / Panel → Spacer → Chassis → Threaded Fastener Interface

The spacer therefore experiences compressive stress.

Its ability to maintain the required spacing depends on:

• polymer

• OD

• ID

• wall thickness

• length

• bearing surfaces

• applied clamp load

• temperature

• time

Tightening Torque Is Not Spacer Compressive Load

A common mistake is to evaluate the spacer using tightening torque alone.

Torque is an installation input.

The spacer experiences compressive force.

The relationship between torque and resulting clamp load depends on:

• thread friction

• bearing friction

• screw material

• thread condition

• lubrication

• washer interface

• joint geometry

Therefore:

Torque Value ≠ Direct Spacer Load Value

Critical applications should be evaluated at the joint level.

Excessive Compression and Barrel Deformation

If a plastic tubular spacer is subjected to excessive compression, possible failure modes can include:

• permanent shortening

• local crushing

• barrel deformation

• wall buckling

• splitting

• flange deformation

• damage to adjacent components

The actual failure mode depends on geometry and material.

Spacer Slenderness

Length relative to cross-section can affect spacer stability.

A long, thin-wall spacer may behave differently from a short, thick-wall spacer even if both use the same material.

Long spacers can be more sensitive to:

• lateral misalignment

• bending

• buckling

• assembly eccentricity

Therefore, compressive capability cannot be determined from material name alone.

Bearing Stress at Spacer Ends

Spacer end faces transfer compressive load into adjacent components.

If the contact area is small, local surface pressure can become significant.

This matters when the spacer bears against:

• PCB laminate

• plastic housing

• thin sheet

• composite panel

• coated surface

Potential responses can include:

• increasing OD

• adding an appropriate washer

• using a flange

• modifying the substrate

• reducing clamp load

The best solution depends on the assembly.

Nylon Flat Washers with Spacers

A Nylon Flat Washer may be used with a spacer where additional bearing area or surface separation is required.

However, the washer adds another polymer component to the compressed stack.

This can influence:

• stack height

• compression

• creep

• tolerance

The washer should therefore be included in the complete joint analysis.

Polymer Creep and Long-Term Spacer Compression

Engineering polymers exhibit time-dependent mechanical behavior.

Under sustained compression, a plastic spacer may experience creep.

A simplified progression is:

Initial Assembly → Compressive Stress → Time + Temperature → Polymer Creep → Change in Spacer Dimension / Joint Condition

The amount depends on:

• polymer grade

• stress

• geometry

• temperature

• moisture

• duration

A plastic spacer should therefore not automatically be treated as dimensionally identical to a metal spacer throughout the life of the equipment.

Stress Relaxation and Clamp Load

In a bolted assembly containing polymer components, time-dependent deformation can change the clamp condition.

This does not mean that every nylon-spacer assembly will loosen.

It means engineers should determine whether the application is sensitive to long-term changes.

A lightly loaded PCB spacing application and a highly preloaded structural joint have very different requirements.

Plastic Spacer vs. Metal Spacer Under High Preload

Metal spacers generally provide much higher stiffness than common unreinforced engineering polymers.

If the primary requirement is to carry high compressive preload with minimal dimensional change, a metal spacer may be more appropriate.

If the application requires:

• low mass

• non-metallic separation

• electrical separation

• selected surface protection

• moderate mechanical loading

a polymer spacer may offer advantages.

Material should follow function.

Electrical Separation

Plastic spacers can create a non-metallic physical separation between components.

This can be useful in:

• electronics

• electrical equipment

• PCB assemblies

• instrumentation

• switchgear control systems

However:

Plastic Spacer ≠ Complete Electrical Insulation System

A nylon spacer alone does not automatically establish:

• creepage distance

• clearance distance

• dielectric withstand

• equipment insulation class

• certified electrical safety

The complete system must be evaluated.

Fastener Through the Spacer Can Remain Conductive

This is an important design detail.

A nylon spacer may separate two surfaces, but if a steel or stainless steel screw passes directly through the spacer and contacts conductive components at both ends, an electrical path may still exist.

Therefore:

Non-Metallic Spacer ≠ Automatically Electrically Isolated Fastener

Where radial screw isolation is also required, engineers may need to evaluate:

• insulating shoulder washers

• insulating bushings

• plastic screws

• other system-level isolation strategies

This is why the related Nylon Flat Washers & Insulating Shoulder Washers page should be internally linked from this article.

Galvanic Corrosion Considerations

A plastic spacer can separate selected metallic surfaces and therefore modify direct metal-to-metal contact.

However, it should not be described as universally preventing galvanic corrosion.

Other electrical paths can remain through:

• screws

• brackets

• grounding hardware

• chassis

• conductive fluids

Galvanic-corrosion control requires evaluation of the complete material and environmental system.

Thermal Break Considerations

Engineering polymers generally conduct less heat than common structural metals.

A plastic spacer may therefore reduce direct conductive heat transfer through the spacer body compared with a metal spacer.

However, the complete assembly may still transfer heat through:

• metallic screws

• panels

• brackets

• air

• other structural paths

Therefore:

Plastic Spacer ≠ Complete Thermal Isolation System

Thermal performance should be evaluated at the assembly level.

Thermal Expansion Mismatch

Plastic spacers can have substantially different thermal expansion behavior from:

• steel

• stainless steel

• aluminum

• copper

• PCB laminates

• ceramics

When equipment moves through a broad temperature range, different components expand and contract by different amounts.

This can affect:

• spacing

• alignment

• clamp load

• connector position

• board stress

Axial vs. Lateral Thermal Effects

Thermal expansion can affect both the spacer length and its diameter.

In a multi-point mounting array, thermal movement can also create lateral constraint if fasteners and holes do not provide adequate accommodation.

Therefore, designers should consider both:

• axial stack change

• in-plane movement

when dimensional precision is critical.

Material Selection for Plastic Spacers

Material selection should follow the real operating environment.

A useful decision path is:

Load → Dimensional Requirement → Temperature → Moisture → Chemical Exposure → Electrical Requirement → Flame Requirement → Manufacturing Requirement → Material

PA66 Nylon Spacers

PA66 is widely used in industrial plastic fastening and spacing components.

Depending on the actual grade, it can offer useful combinations of:

• strength

• toughness

• wear resistance

• moldability

• electrical properties

However, PA66 should not be described as universally suitable or as the automatic material for every spacer.

The actual grade and application should be confirmed.

PA6 Nylon Spacers

PA6 can also be used for plastic spacer applications.

Its suitability depends on the required:

• mechanical performance

• moisture behavior

• temperature

• dimensions

• chemical exposure

Both PA6 and PA66 are hygroscopic materials.

Moisture Absorption and Nylon Spacer Dimensions

Nylon absorbs moisture from the surrounding environment.

Moisture conditioning can influence:

• dimensions

• stiffness

• toughness

• compressive behavior

• creep

• electrical properties

This matters where the spacer controls a precision dimension.

Dry-As-Molded vs. Conditioned Nylon

A nylon spacer measured immediately after molding may not behave identically after reaching moisture equilibrium in service.

Therefore, tight-tolerance designs should consider whether the expected environment can materially affect:

• length

• OD

• ID

• mechanical behavior

The significance depends on the resin grade, geometry, temperature, humidity, and tolerance requirement.

Glass-Filled Nylon Spacers

Glass reinforcement can increase stiffness and modify dimensional behavior.

However, glass-filled nylon should not automatically be described as the correct solution for high compressive preload.

Reinforcement can also affect:

• brittleness

• impact behavior

• anisotropy

• molding shrinkage

• warpage

• surface characteristics

The complete component geometry and application should be evaluated.

POM / Acetal Spacers

POM may be considered where properties such as:

• dimensional stability

• relatively low moisture absorption

• low friction

• wear behavior

are important.

However, its suitability must still be reviewed against temperature, chemical exposure, electrical requirements, and other system constraints.

PEEK Spacers

PEEK may be considered for specialized applications involving demanding combinations of:

• elevated temperature

• chemical exposure

• mechanical performance

• electrical requirements

Its higher material and manufacturing costs mean that it should be specified where the application justifies those characteristics.

Other Engineering Thermoplastics

Other polymers may be evaluated for application-specific requirements.

Material selection should not be based on generic statements such as “high temperature plastic” or “chemical resistant plastic.”

The actual grade and environment must be defined.

Chemical Compatibility

Plastic spacers may encounter:

• oils

• lubricants

• cleaning chemicals

• coolants

• solvents

• process fluids

• humidity

• salt-containing environments

Compatibility should be evaluated using:

Polymer Grade + Chemical + Concentration + Temperature + Exposure Time + Mechanical Stress

This is more reliable than assigning universal chemical-resistance labels.

Flame-Retardant Material Requirements

Some electronic and electrical equipment may require polymer components with specific flammability characteristics.

Where applicable, procurement and engineering teams should specify:

• required material grade

• relevant flammability classification

• thickness-related requirements

• customer-specific documentation

A generic nylon spacer should not automatically be described as flame retardant.

Likewise:

Nylon ≠ Automatically UL 94 V-0

The actual resin grade and applicable thickness must be verified.

Unthreaded Spacer vs. Shoulder Washer vs. Threaded Standoff vs. PCB Support

These products are related but solve different engineering problems.

Unthreaded Spacer

Use when a separate pass-through fastener provides retention and the primary requirement is controlled spacing.

Insulating Shoulder Washer

Evaluate when the screw must be separated from the wall of a conductive panel hole.

Threaded Standoff

Use where the spacing component itself must provide a threaded mounting interface.

Snap-Fit PCB Support

Use where tool-efficient or screw-free PCB mounting is desired and the board/chassis geometry supports snap retention.

A simplified decision tree is:

Need Controlled Distance + Pass-Through Screw? → Unthreaded Spacer

Need Threaded Mounting at Spacer? → Threaded Standoff

Need Radial Screw-to-Panel Isolation? → Shoulder Washer

Need Tool-Free PCB Retention? → Snap-Fit PCB Support

This distinction helps engineers avoid using the wrong component architecture simply because several products appear visually similar.

Engineering Selection Matrix

This matrix is an engineering starting point rather than a universal specification.

Applications in Electronics

Unthreaded nylon spacers can be used for selected:

• PCB mounting

• control boards

• display modules

• electronic enclosures

• sensor assemblies

• power supplies

• instrumentation

Design teams should consider:

• board thickness

• component clearance

• connector alignment

• fastener location

• board deflection

• thermal environment

Electrical Equipment and Switchgear

Potential applications include:

• control electronics

• auxiliary modules

• instrumentation

• low-load internal hardware

• component separation

Where electrical isolation is a functional requirement, the complete conductive path should be reviewed rather than relying on the spacer alone.

AI Servers and High-Performance Computing

AI servers and high-density computing equipment contain:

• large PCBs

• accelerator boards

• power distribution hardware

• cooling structures

• cable-management systems

• high-density connectors

Plastic spacers may be used in selected electronics and auxiliary assemblies where dimensional control, non-metallic separation, and packaging efficiency are required.

Large boards can make multi-point stack-up and alignment particularly important.

Semiconductor Equipment

Semiconductor manufacturing, inspection, and test equipment may require specialized plastic spacing components.

Selection can depend on:

• dimensional stability

• chemical environment

• temperature

• cleanliness

• electrical requirements

• customer material specifications

The equipment specification should control material selection.

Lighting Equipment

Plastic tubular spacers may be used in:

• LED assemblies

• driver modules

• housings

• control boards

• mounting structures

Thermal conditions require particular attention because elevated temperature can affect long-term polymer behavior.

Telecommunications Equipment

Applications may include:

• network hardware

• communication modules

• rack electronics

• PCB assemblies

• power equipment

Dense equipment packaging can make OD and installed-height control important.

Medical Equipment

Potential applications include:

• instrumentation

• electronic modules

• equipment housings

• diagnostic hardware

• control systems

Cleaning environment, mechanical load, temperature, and equipment-specific material requirements should be defined by the manufacturer.

Industrial Automation and Robotics

Plastic spacers may be used in:

• sensors

• controllers

• machine electronics

• vision systems

• communication modules

• instrumentation

Applications may introduce:

• vibration

• oils

• temperature variation

• maintenance cycles

which should be considered during material and joint selection.

Renewable Energy and Energy Storage

Potential applications include selected:

• inverter electronics

• control equipment

• monitoring systems

• BMS electronics

• sensor assemblies

• auxiliary hardware

Outdoor or energy-storage environments may add requirements involving moisture, temperature, chemical exposure, UV exposure, or flammability.

Automotive and EV Electronics

Unthreaded plastic spacers can be used in selected:

• electronic control units

• battery-management electronics

• sensor modules

• displays

• auxiliary electronic hardware

Automotive environments may introduce:

• vibration

• thermal cycling

• humidity

• chemicals

• customer-specific material requirements

The complete operating environment should therefore be defined during sourcing.

Procurement and Second-Source Qualification

Procurement teams may search for unthreaded nylon spacers because they need to:

• replace an existing supplier

• qualify a second source

• source a discontinued component

• reduce supply-chain risk

• consolidate plastic hardware suppliers

• source a custom spacer

• support a new OEM program

A responsible cross-reference should compare more than spacer length.

What Must Be Compared in a Spacer Cross-Reference?

Depending on the application, compare:

• inside diameter

• outside diameter

• length

• ID tolerance

• OD tolerance

• length tolerance

• wall thickness

• flange geometry where applicable

• material

• color

• manufacturing method

• mating fastener

• mating components

• operating environment

A “10 mm nylon spacer” is not automatically interchangeable with every other 10 mm spacer.

Why Exact Length Alone Is Not Enough

Two spacers can have the same nominal length but different:

• tolerances

• ID

• OD

• material

• compression behavior

• moisture response

If the application is sensitive to installed spacing, these differences matter.

Existing Manufacturer Part Number Cross-Reference

For second-source sourcing, customers can submit:

• current manufacturer

• current part number

• OEM internal part number

• drawing

• physical sample

• application information

Juxin Fasteners can review dimensional and material requirements to identify a candidate standard component or determine whether a custom part is more appropriate.

Physical Sample Evaluation

Physical samples can help evaluate:

• ID

• OD

• length

• end-face geometry

• surface condition

• color

• material characteristics

• fit with the mating fastener

• assembly behavior

For critical applications, samples should be tested in the customer's actual or representative assembly.

Sample Validation and Assembly Testing

Depending on the application, validation may include:

• screw pass-through

• fit

• installed height

• alignment

• compression

• board or panel position

• tightening behavior

• environmental conditioning

• long-term functional testing

Validation requirements should follow the actual equipment design.

Custom Unthreaded Nylon Spacers

Standard spacer dimensions do not satisfy every OEM assembly.

Custom plastic spacers may be appropriate when the project requires:

• non-standard length

• non-standard ID

• non-standard OD

• unusual wall thickness

• flange geometry

• stepped geometry

• anti-rotation profile

• integrated locating feature

• special material

• customer-specific tolerances

Juxin Fasteners can review custom spacer requirements from:

• 2D engineering drawings

• 3D CAD models

• physical samples

• existing manufacturer part numbers

• mating-component information

Drawing-Based Spacer Development

A custom spacer drawing should identify functional dimensions rather than over-constraining non-critical geometry.

Typical critical dimensions can include:

• ID

• OD

• length

• flange dimensions

• step dimensions

• relevant tolerances

The drawing can also specify:

• material

• color

• surface requirements

• application-specific notes

• required documentation

Injection-Molded vs. Cut or Machined Plastic Spacers

Depending on:

• geometry

• polymer

• quantity

• tolerance

• annual volume

• tooling economics

different manufacturing approaches may be appropriate.

Simple tubular spacer geometry and complex molded spacer geometry do not necessarily require the same process.

For custom projects, manufacturing strategy should be selected according to engineering and commercial requirements rather than assumed from the product name.

Quality and Compliance Documentation

Depending on the project, procurement teams may request:

• material identification

• resin information

• dimensional inspection

• lot identification

• lot traceability

• RoHS documentation

• REACH documentation

• flammability information where applicable

• customer-specific documentation

Required documentation should be defined during the RFQ and confirmed for the actual product.

RFQ Checklist for Unthreaded Nylon Spacers

For efficient technical and commercial evaluation, provide as much of the following as available:

• current manufacturer

• current part number

• OEM internal part number

• drawing

• physical sample

• inside diameter

• outside diameter

• length

• dimensional tolerances

• flange dimensions if applicable

• step dimensions if applicable

• mating screw or bolt

• fastener material

• mating component materials

• required spacing

• required clamp function

• material

• color

• operating temperature

• humidity / moisture exposure

• chemical exposure

• electrical requirements

• vibration conditions

• flammability requirements where applicable

• required compliance documentation

• sample quantity

• order quantity

• estimated annual volume

• packaging requirements

For precision assemblies, providing the surrounding stack-up dimensions can significantly improve engineering review.

From Engineering Requirement to Production RFQ

For a new spacer application:

Required Separation → Assembly Stack → Fastener → ID → OD → Length → Material → Load Review → Environmental Review → Tolerance Analysis → Sample → Assembly Validation → Production RFQ

For a PCB application:

Board Geometry → Required PCB Height → Fastener Architecture → Spacer Geometry → Component Clearance 

→ Stack-Up → Sample → Board-Level Validation → Production

For a second-source project:

Existing Part → ID / OD / Length Review → Material Review → Mating Hardware Review → Candidate Cross-Reference 

→ Physical Sample → Assembly Validation → Supplier Qualification → Production RFQ

For a custom spacer:

2D/3D Drawing + Mating Components → Engineering / DFM Review → Material & Tolerance Review → Manufacturing Strategy → Sample → Customer Validation → Qualification → Production

Related Plastic Fastening Solutions

Unthreaded spacers should be connected internally to other plastic hardware according to the engineering function.

Related Juxin Fasteners solutions include:

• Nylon Machine Screws for pass-through or all-polymer fastening assemblies

• Nylon Hex Nuts for completing selected non-metallic threaded joints

• Nylon Flat Washers for bearing-area distribution and surface separation

• Insulating Shoulder Washers where radial screw-to-panel separation is required

• Plastic Standoffs where the spacing component must provide a threaded mounting interface

• Snap-Fit PCB Supports where tool-free circuit-board retention is preferred

• Custom Molded Plastic Fasteners for integrated or non-standard spacer geometries

• AI Server Plastic Hardware for high-density electronics and computing infrastructure

The internal-link decision path should follow the assembly problem:

Need spacing with pass-through screw? → Unthreaded Nylon Spacer

Need threaded spacing? → Plastic Standoff

Need face load distribution? → Nylon Flat Washer

Need screw isolation through a metal panel? → Insulating Shoulder Washer

Need snap-in PCB mounting? → Snap-Fit PCB Support

Need non-standard geometry? → Custom Molded Plastic Fasteners

Juxin Fasteners Support for Unthreaded Nylon Spacers and Plastic Tubular Spacers

Juxin Fasteners supplies standard and custom unthreaded nylon spacers, plastic tubular spacers, spacer sleeves, mounting pillars, 

nylon washers, plastic standoffs, PCB supports, nylon screws, nuts, and other polymer fastening components for industrial OEM applications.

Engineering, procurement, supplier-development, and supply-chain teams can submit:

• existing manufacturer part numbers

• OEM internal part numbers

• physical samples

• 2D drawings

• 3D CAD models

• ID / OD / length requirements

• mating fastener information

• assembly stack dimensions

• material requirements

• operating conditions

• estimated annual volume

for technical and commercial evaluation.

For a new spacer application, the key question is not simply:

“What length nylon spacer do I need?”

A better engineering question is:

“What installed distance must be maintained between the components, what fastener passes through the spacer, 

what compressive load enters the spacer, and how will material, temperature, moisture, and tolerances affect that distance over time?”

For second-source qualification, matching nominal spacer length is only the beginning.

The more reliable sourcing path is:

ID + OD + Length + Tolerances + Material + Mating Fastener + Load Path + Environment + Assembly Validation

This approach creates a clearer path from engineering search and product selection to sample evaluation, supplier qualification, custom development, and production sourcing.

Email: info@juxinfasteners.com

Website: www.juxinfasteners.com