Flanged Diamond Knurl Cylindrical Insert Nut

Core Features

Diamond Knurl External Surface – The diamond knurl pattern is formed on the cylindrical body and creates an interference fit when pressed into pre-drilled holes. The cross-hatched knurl pattern provides increased surface contact with the host material, enhancing resistance to pull-out and rotational forces.

Integrated Flange – A circular flange is formed at one end of the cylindrical body, serving as a positive stop to control insertion depth during installation. The flange provides a load-bearing surface that distributes clamping force across the workpiece.

Internal Threaded Bore – The central bore contains pre-formed internal threads that accept standard bolts or screws, enabling component attachment after the insert nut is installed into the base material.

Cylindrical Body with Diamond Knurl – The cylindrical shape with diamond knurling allows the nut to be pressed into holes without requiring specific orientation. The knurling bite provides retention and resists spin-out.

Product Characteristics

The fastener is manufactured with a cylindrical body and diamond knurling on the external surface. The diamond knurl pattern consists of cross-hatched ridges formed along the length of the body, providing enhanced surface contact with the host material. The outer diameter is dimensioned to provide an interference fit with standard hole sizes in the host material.

The integral flange extends outward from the body at the insertion face. The flange underface provides a bearing surface that contacts the workpiece when the insert is fully seated. The flange thickness and diameter are dimensioned to provide adequate load distribution and resist pull-through forces. An undercut at the flange-base junction is designed to allow the insert to sit flush with the host material.

The internal thread is produced with thread dimensions and tolerances following standard metric or imperial thread profiles. Thread classes include 6H for metric specifications and Class 2B for unified standards . Material composition is controlled to meet specified strength requirements. Brass and stainless steel materials are available with polished or plated finishes.

Application Scenarios

Wood and Composite Assembly – Used in furniture manufacturing, cabinetry, and woodworking where insert nuts are pressed into pre-drilled holes to provide threaded attachment points for components. The diamond knurl provides increased retention in wood materials . The flange prevents over-insertion into the hole.

Plastic Enclosure and Molded Parts – Applied in electronic enclosures, plastic housings, and molded components where insert nuts provide threaded receptacles in plastic materials. The diamond knurl increases the retention surface and prevents rotation.

Sheet Metal Applications – Used where a threaded hole is required in sheet metal that is too thin to tap, and where press-fit installation provides a permanent threaded insert.

Electronics and Precision Equipment – Employed in electronic enclosures and instrument casings where external threads or inserts are required for board mounting and mechanical attachments. The flange provides a positive stop for consistent installation depth.

Customization Options

Specifications and configurations can be adjusted based on application requirements. Outer diameter, flange diameter, length, and thread size are customizable according to application geometry. Material grades include brass for general applications with corrosion resistance and decorative appearance, carbon steel for higher strength requirements, and stainless steel for enhanced corrosion resistance. Surface treatments include nickel plating, zinc plating, black oxide, and phosphate coating.

Frequently Asked Questions

Q: What is the difference between diamond knurl and straight knurl insert nuts?
A: Diamond knurl insert nuts feature a cross-hatched knurl pattern that provides increased surface contact with the host material compared to straight knurl patterns. The diamond pattern creates a more secure interface with the surrounding material for applications requiring higher retention force or resistance to rotation.

Q: What is the purpose of the flange on this insert nut?
A: The flange serves as a positive stop during installation, preventing the insert from being pressed too deeply into the hole. It also provides a bearing surface that distributes clamping force across the workpiece and helps resist pull-through forces under load.

Q: What materials are compatible with these insert nuts?
A: Diamond knurl insert nuts are compatible with wood, plastic, and certain metal applications where the insert is pressed into a pre-drilled hole. The host material should be softer than the insert nut material to allow the knurl ridges to bite into the surrounding material.

Q: Can these nuts be removed after installation?
A: The insert nut is intended for permanent installation. Once pressed into the host material, removal typically damages the surrounding material or the nut itself. For applications requiring removal or replacement, alternative fastening methods should be considered.

Q: What is the recommended installation method?
A: The insert nut is pressed into the hole using a press or hammer. Standard drills or drill presses may be used in small production runs, while automatic feeding systems are recommended for large volume production. The flange provides a positive stop for consistent insertion depth.

Q: What torque values can these insert nuts withstand?
A: For brass inserts in materials such as polycarbonate (PC) or ABS, typical pull-out force values range from 56 to 113 kg (123 to 249 lbs) for M3 to M5 sizes. Ultimate torque values range from 2.6 to 7.0 kg-cm for M3 to M5 sizes.

Installation Considerations

The hole diameter should be dimensioned to provide the specified interference fit with the diamond knurled body. Hole tolerance control is important for achieving consistent insertion force and retention performance. During installation, the insert nut should be aligned with the hole and pressed vertically. Angular misalignment may damage both the insert nut and the host material.

The flange ensures consistent insertion depth when the insert is fully seated against the workpiece surface. When installing into plastic materials, consideration should be given to material flow and potential stress cracking. For wood applications, pre-drilling to the recommended diameter should be performed without causing splitting or excessive material displacement. The undercut at the flange-base junction allows the insert to sit flush with the host material. For counterbored applications, the design accommodates flush seating relative to the workpiece surface.