Steel Flat Head Jack Nuts – Easy-Install Slotted Blind Rivet Nuts

Product Specifications — Steel Flat Head Jack Nuts and Easy-Install Slotted Blind Rivet Nuts

JUXIN FASTENERS supplies steel flat head jack nuts for OEM applications requiring reusable female-threaded mounting points in thin sheet metal, selected soft panels and assemblies with restricted rear-side access.

These products are commonly searched for in the United States as jack nuts, easy-install rivet nuts, screw-to-install rivet nuts and slotted blind rivet nuts.

The distinctive feature is the slotted metal body.

During installation, the body collapses behind the parent panel, forming multiple retaining legs or wings.

The expanded structure creates a blind-side bearing area that can help distribute load over a wider region than a narrow undeformed sleeve.

This makes jack nuts a useful fastening option for certain applications where a conventional blind rivet nut may concentrate excessive local pressure.

However, material compatibility and installed strength must be verified for the actual panel and joint.

Technical Product Specifications

Product Name: Steel Flat Head Jack Nut

Alternative Names: Easy-Install Rivet Nut, Screw-to-Install Rivet Nut, Slotted Blind Rivet Nut

Material: Steel

Steel Grade: Subject to approved specification

Surface Finish: Blue-White Zinc

RoHS Compliance: Subject to coating documentation verification

Metric Thread Sizes: M4, M5, M6, M8

Thread Configuration: Internal Female Metric Thread

Head Configuration: Flat Head / Flanged Head

Body Configuration: Slotted Collapsible Body

Retaining Feature: Blind-Side Expanded Legs or Wings

Grip Range: 0.5–5.5 mm across the product family

Body Length: According to approved drawing

Flange Diameter and Thickness: According to approved drawing

Mounting-Hole Dimensions: According to approved drawing

Installation Method: Screw-Activated Setting or Compatible Installation Tool

Mechanical Performance: Subject to application-specific qualification

Packaging: According to confirmed purchasing requirements

Individual dimensions, grip ranges and installation requirements must be verified for each M4, M5, M6 and M8 part number.

1. What Is a Jack Nut?

A jack nut is a blind threaded insert with a slotted body designed to expand behind the parent material during installation.

It provides an internal female thread that remains available for subsequent assembly using a compatible screw.

The fastener is inserted through a prepared mounting hole from the accessible side.

During setting, axial compression causes the slotted body to collapse outward.

The resulting legs or wings form a blind-side retaining structure.

The expanded body helps distribute force over the rear surface of the parent material.

Jack nuts are particularly relevant where the mounting material is thin or where concentrated installation pressure could cause damage.

2. Easy-Install Rivet Nuts — American Market Terminology

In the United States, this product type is often described using terms such as:

Easy-Install Rivet Nuts

Jack Nuts

Screw-to-Install Rivet Nuts

Slotted Blind Rivet Nuts

Collapsible Threaded Inserts

These names describe related installation and structural characteristics.

However, product geometry may differ between manufacturers.

The actual dimensions and installation requirements must be checked before treating different products as interchangeable.

3. How Jack Nuts Work

The slotted body is the main functional feature.

During installation, axial compression causes the slotted sections to deform.

The body expands outward behind the panel.

This creates multiple supporting legs that engage the blind-side surface.

The expanded legs help resist pull-through by distributing force over a wider area.

A properly selected and installed jack nut can provide a retained female thread for subsequent screw assembly.

The exact number and geometry of the expanded legs depend on the product design.

A four-leg configuration is common for certain jack nut designs, but the actual configuration must be verified from the approved drawing.

4. Engineering Information Gain — Why Blind-Side Bearing Area Matters

A thin panel may fail locally even when the threaded insert itself is strong.

The failure may occur through:

• Panel deformation

• Local crushing

• Hole enlargement

• Pull-through

• Cracking around the mounting hole

A jack nut's expanded wings can spread part of the installation and service load over the blind-side surface.

This can be beneficial for selected thin or relatively soft materials.

However, the actual bearing pressure depends on the wing geometry, panel material and applied load.

A wider bearing area does not automatically guarantee higher strength.

The complete joint must be evaluated.

5. Jack Nuts vs. Conventional Blind Rivet Nuts

Jack Nuts

Use a slotted body that expands into multiple retaining legs.

They may be set by a compatible screw-based installation method.

They can be useful for selected thin or soft panels.

Conventional Blind Rivet Nuts

Typically use a continuous deformable metal body.

They are normally installed using a compatible rivet nut setting tool.

They may provide different installed stiffness, retention and rotational resistance.

The two designs should be compared using actual panel conditions and required mechanical performance.

Neither is universally superior.

6. Jack Nuts vs. Rubber Well Nuts

Jack Nuts

Use a deformable metal body.

Retention is created through mechanical expansion of the slotted metal sections.

Rubber Well Nuts

Use a flexible rubber body with an embedded threaded insert.

Retention is created through compression and expansion of the elastomer.

Rubber well nuts may introduce greater joint compliance and vibration damping.

Jack nuts may provide a more rigid metal-threaded mounting arrangement.

However, actual performance depends on the selected product and assembly.

7. Jack Nuts vs. Nylon Cage Captive Nuts

Jack nuts are mechanically expanded during installation.

Nylon cage captive nuts use a retaining cage to hold a metal threaded insert in a compatible panel opening.

A jack nut generally remains installed after the setting operation.

A cage captive nut may be designed for removal or replacement without the same metal-body expansion process.

The appropriate selection depends on mounting-hole geometry, service requirements and installation access.

8. Thin Sheet Metal Applications

Jack nuts may be evaluated for thin sheet-metal assemblies requiring retained internal threads.

Potential applications include:

• Equipment covers

• Access panels

• Fabricated brackets

• Electrical enclosures

• Industrial housings

• Serviceable sheet-metal components

Important selection criteria include:

• Panel thickness

• Material strength

• Mounting-hole diameter

• Edge distance

• Flange seating

• Expanded wing geometry

• Installation force

• Required joint load

Thin panels may be sensitive to local deformation.

The installation procedure should be validated using representative production material.

9. Soft and Brittle Material Applications

Jack nuts may be considered for selected materials such as:

• Engineering plastics

• Composite panels

• Wood-based panels

• Thin metal sheets

• Other materials requiring distributed blind-side support

However, the suitability of a particular material depends on its strength, stiffness, thickness and resistance to cracking.

For brittle materials such as glass or ceramics, the installation process and resulting stress concentrations require especially careful engineering review.

The supplied product information does not establish universal suitability for glass or ceramic applications.

No crack-free installation guarantee is claimed.

10. Engineering Information Gain — Why Soft Materials Need Different Qualification

A jack nut installed in steel sheet metal may behave differently from the same fastener installed in a plastic panel.

Potential differences include:

• Local bearing strength

• Elastic deformation

• Long-term creep

• Temperature sensitivity

• Hole dimensional stability

• Cracking behavior

• Repeated service performance

For plastic panels, the material may deform over time under sustained loading.

For composite panels, local fiber or laminate damage may influence performance.

For wood-based materials, moisture exposure may change the mounting-hole geometry.

The fastener should therefore be qualified in the actual parent material rather than relying on a generic jack nut strength value.

11. Grip Range — 0.5–5.5 mm

The supplied product-family grip range is 0.5–5.5 mm.

Approximate inch references:

0.5 mm = 0.020 in

5.5 mm = 0.217 in

Grip range refers to the parent-material thickness that the selected fastener is designed to accommodate during installation.

It is not the same as the uninstalled body length.

The approved grip range may differ between M4, M5, M6 and M8 variants.

An incorrect grip selection can lead to incomplete expansion, poor flange seating or excessive panel deformation.

12. Metric Thread Sizes and Inch References

The confirmed thread sizes are:

M4
M5
M6
M8

Approximate nominal diameter references:

M4 = 0.157 in

M5 = 0.197 in

M6 = 0.236 in

M8 = 0.315 in

These are dimensional conversions only.

They are not equivalent UNC, UNF or BSW thread designations.

ISO 261 and ISO 965 provide relevant references for ISO metric thread combinations and tolerances.

Actual thread pitch and tolerance must be confirmed from the approved drawing.

13. Mounting-Hole Preparation

The mounting hole must be compatible with the selected jack nut body.

Important characteristics include:

• Hole diameter

• Hole tolerance

• Panel thickness

• Edge distance

• Burr condition

• Local flatness

• Surface coating

• Parent-material strength

An oversized hole may reduce retention.

An undersized hole may prevent insertion or damage the fastener.

Some jack nut designs may tolerate certain hole variations, but this should not be treated as a universal specification.

The approved drawing must determine the mounting-hole dimensions.

14. Flat Head and Flange Function

The flat head provides a bearing surface on the accessible side of the panel.

During installation, the head helps position the fastener against the parent material.

The blind-side legs expand behind the panel.

Together, the head and expanded legs create the retaining structure.

Important head dimensions include:

• Flange diameter

• Flange thickness

• Head flatness

• Seating geometry

• Surface finish

A flat head does not automatically mean flush mounting.

Actual head projection must be verified.

15. Installation Using a Compatible Screw

Certain jack nut designs can be installed using a compatible screw and appropriate supporting hardware.

A typical screw-setting process involves:

1. Preparing the mounting hole.

2. Verifying the correct jack nut size.

3. Inserting the jack nut into the hole.

4. Engaging the compatible screw with the internal thread.

5. Applying the approved setting action.

6. Compressing the slotted body.

7. Expanding the retaining legs behind the panel.

8. Confirming proper flange seating.

9. Inspecting the installed fastener.

The screw-setting arrangement must be suitable for the selected product.

The installation procedure should not be improvised where controlled production quality is required.

16. Installation Using a Rivet Nut Tool

For higher-volume production, compatible installation equipment may improve process consistency and cycle time.

Tool selection should consider:

• Thread size

• Setting stroke

• Required setting force

• Body length

• Flange geometry

• Panel thickness

• Tool access

• Installation repeatability

Not every conventional rivet nut tool is automatically compatible with every jack nut design.

The actual equipment and setting parameters must be verified.

17. Engineering Information Gain — Installation Screw Length

Screw length is important during jack nut setting.

The installation arrangement must provide sufficient thread engagement and allow the body to deform correctly.

Relevant dimensions include:

• Jack nut body length

• Mating component thickness

• Washer thickness

• Required thread engagement

• Available blind-side clearance

• Tool or setting fixture geometry

A simplified screw-length rule should not replace the approved installation specification.

The required screw length must be confirmed for the actual fastener and setting method.

18. Installation Force and Panel Damage

The slotted body must deform sufficiently to create the retaining wings.

Insufficient setting may produce incomplete expansion.

Excessive setting may damage the panel, fastener or internal thread.

Possible failure conditions include:

• Overexpanded legs

• Panel crushing

• Flange distortion

• Thread damage

• Uneven leg formation

• Hole enlargement

Installation parameters should be validated using representative panel materials and production conditions.

19. Steel Material and Blue-White Zinc Finish

The confirmed base material is steel.

The exact steel grade and material condition have not been supplied.

The confirmed surface treatment is blue-white zinc.

This finish description does not independently define the complete coating specification.

The approved coating requirements may include:

• Zinc coating type

• Coating thickness

• Conversion coating

• Supplemental treatment

• Appearance

• Corrosion requirements

• Thread compatibility

• Restricted-substance requirements

ISO 4042 provides a relevant reference for electroplated coating systems on steel fasteners where applicable.

No particular coating thickness or corrosion rating is claimed.

20. RoHS Compliance Verification

The supplied finish is described as RoHS blue-white zinc.

RoHS compliance cannot be established from color or commercial finish terminology alone.

Where required, the customer should specify appropriate restricted-substance documentation for the actual supplied coating system.

The final compliance requirements should be confirmed during OEM technical review.

21. Corrosion Protection

Zinc plating can provide corrosion protection to steel fasteners.

Actual performance depends on:

• Coating thickness

• Conversion coating

• Supplemental treatment

• Moisture exposure

• Salt exposure

• Mechanical damage

• Storage conditions

• Service environment

Where corrosion testing is required, ISO 9227 or ASTM B117 may provide relevant test methods.

No specific salt-spray rating or outdoor service-life guarantee is claimed.

22. Hydrogen Embrittlement Considerations

Certain electroplating processes can introduce hydrogen into steel components.

For susceptible materials, hydrogen may contribute to delayed cracking under specific conditions.

The relevance depends on steel strength, hardness, coating process and applied stress.

Because the exact steel grade and hardness have not been confirmed, no product-specific hydrogen embrittlement classification is claimed.

Where applicable, material and coating specifications should address relevant controls.

23. Pull-Out Resistance

Pull-out resistance describes the installed fastener's ability to resist axial extraction from the parent material.

For jack nuts, performance depends on:

• Expanded wing geometry

• Panel thickness

• Parent-material strength

• Mounting-hole dimensions

• Installation quality

• Flange seating

• Applied load direction

No universal pull-out value is claimed.

The installed fastener should be tested under representative conditions where mechanical performance is critical.

24. Spin-Out Torque and Rotational Resistance

Spin-out torque describes resistance to rotation of the installed fastener within the mounting hole.

Jack nut rotational resistance may depend on:

• Body geometry

• Expanded leg engagement

• Panel material

• Hole dimensions

• Installation deformation

• Applied assembly torque

A jack nut should not automatically be assumed to have the same spin-out resistance as a knurled or hexagonal blind rivet nut.

The required performance should be defined and verified.

25. Reusable Internal Threads

After installation, the jack nut provides a retained internal female thread.

The mating screw may be removed and reinstalled for maintenance.

However, reusable threads do not mean that the expanded jack nut body itself is designed for repeated removal and reinstallation.

The installed fastener should be inspected if the connection has experienced damage, excessive loading or abnormal service conditions.

26. Automotive Applications

Potential applications include selected:

• Interior equipment panels

• Access covers

• Non-structural mounting brackets

• Fabricated housings

• Accessory mounting points

Automotive use requires project-specific evaluation of vibration, corrosion, fatigue and installation repeatability.

No safety-critical automotive approval is implied.

27. Electrical Cabinets and Power Equipment

Jack nuts may be evaluated for:

• Control cabinet panels

• Equipment covers

• Internal mounting brackets

• Electrical enclosures

• Instrument housings

Engineering considerations include panel thickness, installation access, grounding requirements, mechanical retention and service conditions.

No electrical safety certification is claimed.

28. Telecommunications Equipment

Potential applications include:

• Communications cabinets

• Network equipment enclosures

• Service panels

• Internal equipment brackets

• Fabricated mounting structures

The one-sided installation capability may be useful where access to the rear of the panel is restricted.

The actual installation geometry must be verified.

29. Commercial Foodservice Equipment

Jack nuts may be considered for selected:

• Equipment covers

• Control housings

• Internal brackets

• Serviceable panels

• Fabricated enclosures

Material and coating suitability must be evaluated for moisture, cleaning chemicals and equipment hygiene requirements.

No direct food-contact approval is claimed.

30. Industrial Machinery and Equipment Housings

Potential applications include:

• Machine guards

• Equipment covers

• Service access panels

• Light mounting brackets

• Instrument housings

• Fabricated metal assemblies

Where vibration is present, the complete threaded connection must be evaluated for loosening resistance and fatigue.

31. Engineering Example — Thin Plastic Equipment Panel

Consider an OEM equipment enclosure requiring an M5 internal threaded attachment point in a thin plastic panel.

Rear-side access is restricted.

A jack nut may be evaluated because its slotted body expands behind the panel.

The engineer should confirm:

1. Plastic material

2. Panel thickness

3. Mounting-hole diameter

4. M5 thread specification

5. Jack nut body length

6. Grip range

7. Expanded wing geometry

8. Available blind-side clearance

9. Installation method

10. Setting force

11. Required pull-out resistance

12. Required rotational resistance

13. Mating screw length

14. Service temperature

15. Repeated maintenance requirements

The jack nut should be tested in the actual plastic material.

The presence of broad retaining wings does not guarantee that a brittle panel will remain undamaged.

32. Engineering Example — Oversized Hole in Thin Sheet Metal

An OEM may have an existing mounting hole that is larger than the nominal screw diameter.

A jack nut may provide a retained threaded connection without requiring the screw to engage the panel directly.

However, the mounting hole must still be compatible with the jack nut body and flange.

The engineering team should confirm:

• Existing hole diameter

• Hole tolerance

• Panel thickness

• Flange coverage

• Expanded wing support

• Required retention

• Screw alignment

• Installation access

An oversized hole should not automatically be accepted without dimensional verification.

33. Procurement Information Gain — Why Jack Nut Substitution Requires Installation Review

Two suppliers may offer M6 steel jack nuts with similar appearances.

However, the products may differ in:

• Body length

• Slot geometry

• Number of retaining legs

• Flange diameter

• Grip range

• Mounting-hole requirements

• Setting force

• Installed blind-side projection

• Mechanical retention

A lower unit price may be offset by additional tooling, assembly changes or qualification costs.

For OEM sourcing, the approved drawing and installation procedure should be included in the supplier comparison.

34. OEM Supplier Qualification

Purchasing and supplier development teams should verify:

Product Geometry

Confirm flange, body, slots and internal thread.

Material

Verify the required steel grade and material condition.

Coating

Define the blue-white zinc coating system.

Panel Compatibility

Confirm mounting-hole dimensions and grip range.

Installation

Verify screw-setting or tool-setting requirements.

Mechanical Performance

Define pull-out, rotational resistance and other applicable tests.

Documentation

Specify inspection records, traceability and drawing revision requirements.

Commercial Terms

Confirm order quantity, annual forecast, packaging and delivery expectations.

35. Drawing-Based OEM Requirements

Potential customer-specific requirements include:

• Special flange diameter

• Modified flange thickness

• Alternative body length

• Different grip range

• Controlled slot geometry

• Defined steel grade

• Customer-specified coating

• Special thread tolerance

• Application-specific installation requirements

• Inspection documentation

• Packaging and traceability

Nonstandard requirements are subject to technical review and manufacturing feasibility confirmation.

36. Frequently Asked Questions

What are jack nuts?

Jack nuts are slotted blind threaded inserts that expand into retaining legs behind a panel during installation.

Are jack nuts the same as easy-install rivet nuts?

Easy-install rivet nuts is a common commercial term for screw-set products of this type.

Can jack nuts be installed with a screw?

Certain designs can be set using a compatible screw-based installation arrangement. The actual method must follow the approved product requirements.

Do jack nuts require special installation tools?

Some designs can be installed without a dedicated powered rivet nut tool. Compatible tools may improve production speed and consistency.

Are jack nuts suitable for plastic?

They may be suitable for selected plastic panels, subject to material, hole geometry and installation testing.

Can jack nuts be used in brittle materials?

Potential use depends on the material and joint design. Crack-free installation cannot be assumed.

Do jack nuts damage thin sheet metal?

Their expanded legs can distribute load, but excessive setting force or unsuitable panel geometry may still cause deformation.

Are jack nuts reusable?

The internal thread can support subsequent screw removal and reinstallation, subject to condition. The expanded body is not necessarily reusable after removal.

How much weight can a jack nut hold?

There is no universal value. Capacity depends on the product, panel material, hole geometry, installation and load direction.

How do you prevent a jack nut from spinning?

Correct mounting-hole dimensions and installation are essential. Actual spin-out resistance must be verified.

Are jack nuts waterproof?

Not automatically. The specified blue-white zinc version has no confirmed sealing feature.

What is the difference between a jack nut and a rubber well nut?

A jack nut uses a deformable metal body. A rubber well nut uses an elastomer body with an embedded metal threaded insert.

37. Related Industrial Fastening Solutions

Engineers and purchasing teams may also consider these related JUXIN FASTENERS product categories.

Thin Head Blind Rivet Nuts — for reduced-profile blind threaded inserts.

Flat Head Blind Rivet Nuts — for conventional mechanically installed female-threaded inserts.

Knurled Body Blind Rivet Nuts — for alternative rotational resistance characteristics.

Hexagonal Body Blind Rivet Nuts — for polygonal mounting-hole engagement.

Rubber-Coated Rivet Nuts / Well Nuts — for compliant mounting and vibration-damping applications.

Blind Captive Nuts — for cage-retained threaded inserts.

Self-Clinching Nuts — for suitable press-installed sheet-metal applications.

Weld Nuts — for applications designed around an approved welding process.

These product names are contextual internal-link anchor texts. Hyperlinks should be added only to verified relevant live product pages.

38. OEM RFQ Checklist

For accurate quotation and technical review, please provide:

1. Required thread size

2. Engineering drawing or CAD file

3. Steel grade requirements

4. Blue-white zinc coating specification

5. Parent-panel material

6. Panel thickness

7. Required grip range

8. Mounting-hole dimensions

9. Flange diameter and thickness

10. Body length

11. Slot and leg geometry requirements

12. Available blind-side clearance

13. Installation method

14. Setting force or stroke requirements

15. Mating screw specification

16. Required pull-out resistance

17. Required spin-out torque

18. Corrosion or compliance documentation

19. Initial order quantity

20. Estimated annual demand

21. Packaging and traceability requirements

For established OEM projects, providing the current fastener drawing and installation details helps determine technical interchangeability.

39. JUXIN FASTENERS — OEM Jack Nut Supply

JUXIN FASTENERS supplies industrial fastening products for international OEM engineers, purchasing managers, supplier development teams and equipment manufacturers.

Our steel flat head jack nuts provide a slotted-body blind fastening option for creating reusable internal threaded mounting points in selected thin sheet-metal and soft-panel assemblies.

The confirmed product family includes M4, M5, M6 and M8 metric thread sizes with blue-white zinc finish.

For technical review and quotation, customers may submit drawings, panel specifications, installation requirements and purchasing quantities.

Request an OEM Technical Quotation

Email: info@juxinfasteners.com

Website: www.juxinfasteners.com

Please include the required thread size, panel material, mounting-hole dimensions, grip range, installation method and estimated annual demand.

JUXIN FASTENERS — Industrial Fastening Solutions for OEM Engineering and Global Procurement.

Product Packaging — Steel Flat Head Jack Nuts

Packaging for M4, M5, M6 and M8 steel flat head jack nuts with blue-white zinc finish is subject to confirmed order quantities and customer requirements.

Protective Packaging: Suitable arrangements may be specified to protect internal threads, flat flange surfaces, slotted body sections and zinc-coated surfaces during handling and transportation.

Body Protection: Packaging should consider the risk of deformation or damage to the slotted sections before installation.

Outer Cartons: Carton arrangements may be reviewed according to product quantity, shipment weight and handling requirements.

Pallet Packaging: Palletized shipments may be considered for bulk industrial orders, subject to confirmation.

Product Identification: Customer-specified labels may identify part number, thread size, material, surface finish, quantity, lot number and drawing revision.

Lot Traceability: Material and production traceability requirements should be defined in the approved purchasing and quality documentation.

OEM Packaging: Customer-specific packing quantities, labeling, component segregation and logistics instructions are subject to review.

Final packaging details will be confirmed against the approved purchase order.

For OEM quotations and packaging requirements:

Email: info@juxinfasteners.com

Website: www.juxinfasteners.com