Stainless Steel Knurled Pin 304 With Cold Heading Or Turning Process

Product introduction

This product is a customized stainless steel non-standard part. It is made of 304 stainless steel. The head or shaft is equipped with knurling structures such as straight lines and mesh patterns to increase friction and holding force during press-fitting and prevent loosening. As a typical non-standard stainless steel part, it is widely used in precision electronics, medical equipment, instrumentation and other scenarios that require anti-rotation and corrosion resistance.

We provide customized services for 304 stainless steel non-standard parts and 316 non-standard parts. The knurling specifications, length and head shape can be processed according to the drawings. Adopt cold heading or turning technology to support small batch samples and large batch supply. As cold heading non-standard parts and special-shaped stainless steel screw parts, you are welcome to inquire about drawings.

 

Product design and features

Knurled anti-rotation structure: The surface is equipped with precision knurled texture, which generates strong friction with the hole wall after being pressed in and installed, effectively preventing axial movement and circular rotation without threads or adhesives;

Various knurling forms: Straight (axial anti-slip), mesh (multi-directional anti-rotation), twill (specific direction anti-rotation) and other types are available to adapt to different holding needs;

Guide design: The end can be processed with chamfers or guide cones to facilitate press-in installation and improve assembly efficiency;

304 stainless steel material: has good corrosion resistance, non-magnetism, excellent comprehensive mechanical properties, and is suitable for most industrial environments;

Diversified head types: Can be matched with cylindrical head, countersunk head, flat head, knurled head, spherical head, etc. to form special-shaped stainless steel screw parts.

 

Materials and application fields

304 stainless steel non-standard parts: general-purpose austenitic stainless steel, with good corrosion resistance and comprehensive mechanical properties, excellent cold heading forming performance, suitable for most indoor and outdoor environments, and is the most commonly used stainless steel knurled pin material;

316 non-standard parts: Added molybdenum element, stronger resistance to chloride ion corrosion, suitable for high-corrosion environments such as coastal areas, marine engineering, chemical equipment, and medical equipment;

303 stainless steel: high sulfur content, excellent cutting performance, suitable for complex parts that require precision secondary processing;

410 stainless steel: martensitic stainless steel, the hardness can be improved through heat treatment, and is suitable for scenes with special requirements for strength.

 

As non-standard stainless steel parts, its application fields are wide:

Precision electronics: internal positioning and holding of mobile phones, tablet computers, and digital cameras;

Medical devices: internal structural parts of surgical instruments, diagnostic equipment, and monitors;

Instruments: multimeters, oscilloscopes, rotating shafts and limit pins of measuring instruments;

Automobile manufacturing: interior parts positioning, sensor fixing, switch components;

Mold manufacturing: mold limit pins, guide pins, positioning pins;

Office equipment: transmission and positioning components inside printers and copiers;

Aerospace: positioning and holding components for precision instruments.

 

Quality control and certification system:

Spectral testing of raw materials ensures that 304/316 ingredients meet standards;

The knurling tooth shape, pitch and depth are inspected according to the diagram;

The outer diameter, length, and coaxiality are randomly inspected using an imager or projector;

Salt spray test to verify corrosion resistance;

Through the ISO 9001 system, material reports and dimensional inspection reports can be provided.

 

Quality control and certification system

Raw material control: All stainless steel materials come with material certificates, and the composition is verified by a spectrum analyzer to ensure compliance with 304, 316 and other brand standards; each batch of 304 stainless steel non-standard parts or 316 non-standard parts can be traced back to the original furnace number;

Dimensional accuracy control: Key dimensions (knurl outer diameter, rod diameter, total length, head size) are fully inspected or AQL sampled using professional measuring tools such as image measuring instruments, projectors, and micrometers;

 

Knurling quality control:

The knurling pattern is clear and uniform, with no missing, random or heavy teeth;

The knurling depth, pitch and angle meet the design requirements;

The transition between the knurled part and the stem is smooth and burr-free;

Mechanical property testing: including tensile strength and hardness testing to verify material properties;

Press-in force test: simulate actual installation conditions, test the press-in force and pull-out force of the knurled pin, and ensure that the holding force meets the design requirements;

Corrosion resistance test: Provide neutral salt spray test report according to application environment requirements;

System certification: The company has passed ISO 9001 quality management system certification, and medical device products can meet the requirements of ISO 13485, ensuring that each batch of cold heading non-standard parts has complete traceability.

Customized services

Size customization: knurled outer diameter (φ0.8mm–φ20mm), rod diameter, total length (5mm–150mm), and guide cone angle can all be customized according to customer drawings or samples;

Head type customization: As special-shaped stainless steel screw components, special head types such as cylindrical head, countersunk head, flat head, knurled head, spherical head, T-shaped head, flange head, etc. can be customized;

 

Knurled form customization:

Straight grain knurling: suitable for axial anti-slip and preventing axial movement;

Textured knurling: suitable for multi-directional anti-rotation to prevent axial and circumferential movement;

Twill knurling: suitable for anti-rotation in specific directions;

Partial knurling: Only part of the area is knurled, and the rest is smooth;

Double-section knurling: designing knurling areas with different specifications on the same part;

Material customization: 304, 304L, 316, 316L, 303, 410, 416 and other stainless steel materials can be selected according to special requirements such as corrosion resistance, strength, and non-magnetism;

Surface treatment customization: stainless steel natural color, passivation, electrolytic polishing, brushing, mirror polishing, etc.;

 

Processing technology customization:

Cold heading non-standard parts: suitable for mass production, low cost, high strength and high material utilization rate;

CNC turning: suitable for small batches, complex shapes or parts with extremely high tolerance requirements;

Cold heading + secondary processing: composite process, taking into account both efficiency and precision;

Packaging methods: Bulk, bagged, pallet packaging, tape packaging (suitable for automatic assembly lines), anti-static packaging, etc. are available.

 

FAQ

Q: What is the difference between knurled pins and smooth pins?

A: The surface of the knurled pin has a knurled texture, which creates an interference fit with the hole wall after being pressed in and installed. The pull-out resistance and anti-rotation ability are much better than those of smooth pins; smooth pins require higher precision fit tolerances or additional locking methods. Therefore, knurled pins are typical non-standard stainless steel parts and are suitable for scenarios that require reliable holding.

 

Q: Is this product a standard part?

A: No. Stainless steel knurled pin 304 is a customized stainless steel non-standard part. There is no unified standard specification on the market. The knurled form, outer diameter, length, and head shape all need to be customized and produced according to customer drawings.

 

Q: How to ensure the holding force of knurled pins?

A: The holding force depends on three factors: the interference between the knurled outer diameter and the mounting hole, the knurled tooth shape and depth, and the material hardness. We optimize the knurling parameter design based on the mounting hole size and base material hardness provided by the customer, and verify the holding force through press-in force and pull-out force tests to ensure the reliability of special-shaped stainless steel screw components.

 

Q: What is the difference between cold heading process and turning process? Which one is better?

A: Cold heading non-standard parts are formed in one step through metal plastic deformation. The metal flow lines are continuous, high strength and high material utilization rate (90%-95%). They are suitable for mass production and lower cost. The turning process is suitable for small batches, complex shapes or parts with extremely high tolerance requirements, but the material utilization rate is low. For medium and large quantities of knurled pins, cold heading is a more economical and reliable option.

 

Q: Will knurling affect the dimensional accuracy of the pin?

A: The outer diameter of the knurl will be slightly larger than the base diameter of the rod. We strictly control the matching size of the outer diameter of the knurl and the mounting hole. Each batch of products uses an image measuring instrument to detect key dimensions such as knurl outer diameter, rod diameter, coaxiality, etc. to ensure the press-fitting effect without damaging the workpiece.

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