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Non-Threaded Through-Hole PCB Broaching Fasteners – JX-KFE / JX-KFSE

JUXIN FASTENERS supplies JX-KFE and JX-KFSE non-threaded through-hole broaching fasteners for printed circuit boards, electronic assemblies, and precision mounting applications.

Unlike internally threaded PCB broaching nuts, these fasteners feature a smooth, unthreaded central opening. Their externally formed broaching features engage a compatible substrate during press installation, providing a permanently retained through-hole component for applications requiring clearance, positioning, or guided attachment.

Stainless steel material options include SUS302, SUS303, SUS316, SUS410, SUS420, and SUS430, subject to product design and material suitability.

Custom bore dimensions, external geometry, material grades, and surface finishes can be reviewed against customer drawings.

For detailed dimensions and installation requirements, refer to the applicable product specification sheets and CAD drawings on pages 41–42.

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Product Specification

Non-Threaded Through-Hole PCB Broaching Fasteners – JX-KFE / JX-KFSE

Precision Press-Fit Mounting Solutions for PCB and Electronic Assemblies

JUXIN FASTENERS offers JX-KFE and JX-KFSE non-threaded through-hole broaching fasteners for applications requiring a retained, unthreaded opening in printed circuit boards and compatible engineering materials.

These fasteners combine an external broaching shank with a central through-hole. The external engagement features secure the component in a properly prepared mounting hole, while the unthreaded bore provides a passage for a mating component or serves another drawing-defined mechanical function.

They are particularly relevant to electronic assemblies where the design requires a fixed mounting feature but does not require internal female threads.

Unlike conventional threaded broaching nuts, JX-KFE and JX-KFSE fasteners are not intended to provide direct screw-thread engagement within the insert itself.

Product Design and Material Selection

Product types: JX-KFE and JX-KFSE

Fastener category: Non-threaded through-hole PCB broaching fasteners

Attachment method: Press-fit broaching engagement

Internal configuration: Unthreaded through-hole

External configuration: Broaching shank with mechanical engagement features

Primary application: PCB and electronic component mounting

Material family: Stainless steel

Potential stainless steel grades include SUS302, SUS303, SUS316, SUS410, SUS420, and SUS430, subject to the approved drawing and material review.

The final material grade should be selected according to the required mechanical properties, corrosion environment, manufacturing process, and substrate compatibility.

Austenitic stainless steels such as SUS302 and SUS316 differ from martensitic grades such as SUS410 and SUS420 in hardness, corrosion resistance, and other characteristics.

These grades should not be treated as interchangeable without engineering approval.

External dimensions, through-hole diameter, body height, and installation requirements must be confirmed using the applicable JUXIN FASTENERS product drawings.

The product family can also be reviewed for customer-specific dimensional requirements.

How Non-Threaded Broaching Fasteners Work

A non-threaded broaching fastener uses specially formed external engagement features to create mechanical retention in a compatible mounting substrate.

During installation, the fastener is aligned with a prepared hole and pressed into position using suitable tooling.

As the fastener enters the substrate, its external broaching features engage the surrounding material. This mechanical interaction helps resist unwanted rotation and movement.

The central opening remains unthreaded.

Depending on the approved design, the opening may provide clearance for a screw, passage for a locating pin, or another defined mechanical interface.

The opening should not automatically be treated as a precision bearing surface or a load-rated guide bushing. Such functions require appropriate dimensional tolerances, surface characteristics, and application testing.

The main engineering advantage is the ability to incorporate a retained, unthreaded attachment feature into a compatible PCB or electronic component without relying on loose hardware at that location.

PCB Installation and Hole Design

The quality of a broaching installation depends on the relationship between the fastener geometry, mounting hole, substrate material, and pressing process.

The mounting hole should be prepared to the dimensions specified in the approved product drawing.

The fastener must be installed with appropriate axial alignment and adequate support beneath the surrounding substrate.

Press tooling should distribute installation forces without creating excessive board bending or localized damage.

Important installation considerations include:

Substrate material and thickness.

Mounting hole diameter and tolerance.

Distance to nearby board edges and openings.

Fastener insertion depth and seating condition.

Punch and anvil geometry.

Required insertion force.

Clearance from copper traces and sensitive electronic components.

Expected mechanical loads during assembly and service.

An oversized mounting hole may reduce the engagement between the broaching features and the substrate.

An undersized hole may generate excessive installation stress and increase the risk of cracking or other substrate damage.

Because PCB laminates and engineering plastics differ significantly in mechanical behavior, a successful installation in one material does not establish suitability for another.

For new applications, installation trials using the actual production substrate are recommended.

Engineering Selection: Through-Hole Clearance and Functional Fit

The central opening is the defining difference between JX-KFE / JX-KFSE and internally threaded broaching nuts.

Engineers should specify the intended function of the opening before selecting its diameter and tolerance.

Clearance-hole applications

Where a screw or other fastener passes through the insert, the opening must provide sufficient clearance for the selected mating component.

The required clearance depends on the assembly tolerance stack-up, screw diameter, positioning requirements, and the relationship between the connected parts.

Locating and positioning applications

Where a pin or similar component passes through the insert, the required fit must be established through the engineering drawing.

A nominally unthreaded opening does not automatically provide a precision locating fit.

Assembly support applications

Where the insert forms part of a mounting or support arrangement, engineers must determine how forces transfer through the insert, substrate, and mating component.

The fastener's installed retention and the strength of the surrounding board should be evaluated together.

Repeated assembly applications

If a screw repeatedly passes through the opening, the design should consider possible contact, wear, edge damage, and alignment changes over the expected service life.

This is particularly important when the screw, insert, and surrounding substrate have different hardness or stiffness characteristics.

A through-hole broaching fastener should therefore be selected by its complete mechanical interface rather than by its outside diameter alone.

Typical Industrial Applications

Printed Circuit Board Assemblies

JX-KFE and JX-KFSE broaching fasteners may be used in PCB assemblies that require retained through-hole features for compatible mounting hardware.

They can support compact mechanical designs where loose washers or separate positioning components would complicate assembly.

Electronic Control Modules

Industrial controllers, communication modules, and embedded electronic systems often require carefully positioned mechanical attachment points.

Non-threaded broaching fasteners can be evaluated for applications where a defined passage or mounting interface is required within a compatible substrate.

PCB-to-Chassis Connections

Electronic assemblies frequently connect circuit boards to metal chassis, frames, or mounting brackets.

An unthreaded insert may form part of a through-fastened joint, provided the screw, mating thread, clamping arrangement, and substrate loading are designed appropriately.

The broaching fastener does not replace the mating threaded component in this configuration.

Industrial Instrumentation

Measurement devices and sensor assemblies may require compact mechanical interfaces with controlled positioning.

The suitability of a non-threaded insert depends on the required dimensional accuracy, substrate material, and installation performance.

Telecommunications Equipment

Networking and communication assemblies may use compact press-fit hardware where board space and assembly access are limited.

The design must account for surrounding electrical features, service requirements, and any expected vibration.

Automation and Embedded Systems

PCB assemblies used in automation equipment may require mechanical attachment features that remain in place during production and servicing.

Broaching inserts may be considered where their retention mechanism is compatible with the board material and the expected mechanical loading.

JX-KFE / JX-KFSE vs. Threaded PCB Broaching Nuts

Selecting between threaded and non-threaded broaching fasteners begins with the required assembly function.

JX-KFE / JX-KFSE non-threaded through-hole fasteners provide an unthreaded opening. They are relevant when a mating component must pass through the insert or when a drawing-defined clearance or positioning function is required.

JX-KF2 / JX-KFS2 threaded broaching nuts contain internal female threads. They are relevant when a screw must engage directly with the installed insert.

These two product families are not direct substitutes.

For example, if a PCB mounting bracket must be secured by a screw engaging a permanent female thread in the board, a threaded broaching nut may be the more appropriate option.

If the screw must pass through the board and engage a separate chassis-mounted thread, an unthreaded through-hole insert may be considered.

The correct choice also depends on available space, substrate strength, assembly sequence, and maintenance requirements.

Broaching Technology vs. Other PCB Attachment Methods

Broaching fasteners are one of several technologies used to create mechanical attachment points in electronic assemblies.

Conventional self-clinching fasteners generally rely on plastic deformation of ductile sheet metal.

Broaching fasteners instead use external engagement features that interact mechanically with a compatible substrate.

Surface-mount fastening components rely on an approved solder attachment process and may be suitable for PCB production workflows designed around automated placement and reflow.

Threaded standoffs provide defined spacing between components or circuit boards.

Loose screws, nuts, and washers may be suitable for prototypes or low-volume assemblies but can increase part handling and assembly complexity.

The most appropriate fastening method should be selected according to the substrate, joint function, production process, and mechanical performance requirements.

OEM Engineering and Procurement Considerations

For OEM design engineers, the main selection criteria are installation compatibility, hole geometry, dimensional fit, and performance after assembly.

For procurement and supplier development teams, additional considerations include material consistency, drawing control, inspection requirements, packaging, and repeatability across production batches.

A technical RFQ for JX-KFE or JX-KFSE should identify:

Product type and required dimensions.

Through-hole diameter and tolerance.

Substrate material and thickness.

Installation hole dimensions.

Required stainless steel grade.

Surface finish, if applicable.

Mechanical retention requirements.

Mating component dimensions.

Estimated order quantity and annual demand.

Required inspection and documentation.

Packaging and delivery requirements.

For new applications, customers should consider evaluating representative samples in the actual PCB or component material before approving volume production.

Custom Non-Threaded Broaching Fasteners

Standard configurations may not satisfy every electronic assembly design.

JUXIN FASTENERS can review customer drawings for non-standard bore dimensions, external shank geometry, body height, material selection, and other application-specific requirements.

Custom requests are subject to technical feasibility, manufacturing review, and commercial confirmation.

Where a customer requires specific corrosion protection, electrical characteristics, or mechanical performance, these requirements should be included in the RFQ.

Relevant ISO, ASTM, EN, DIN, or ASME standards may be referenced where applicable to the material, inspection method, or associated assembly components.

No specific product certification or mechanical performance rating should be assumed without supporting documentation.

Frequently Asked Questions

What is a non-threaded PCB broaching fastener?

It is a press-fit component with external broaching engagement features and an unthreaded central opening. It is used to create a retained mechanical interface in a compatible PCB or component material.

What is the difference between JX-KFE / JX-KFSE and JX-KF2 / JX-KFS2?

JX-KFE and JX-KFSE are non-threaded through-hole types. JX-KF2 and JX-KFS2 are internally threaded broaching nuts designed to receive mating screws.

Can JX-KFE and JX-KFSE be used with screws?

A screw may pass through the unthreaded opening if the bore diameter and assembly design are suitable. The insert itself does not provide female screw threads.

Can these fasteners be installed in any PCB material?

No. Substrate compatibility depends on laminate construction, thickness, hole geometry, and installation conditions. Representative installation testing is recommended.

Can the through-hole diameter be customized?

Customer-specific bore dimensions can be submitted for engineering and manufacturing feasibility review.

Are stainless steel broaching fasteners suitable for every environment?

No. Corrosion resistance and mechanical behavior vary by stainless steel grade. The appropriate material must be selected for the actual application.