Stainless Steel Flat Head Threaded Screws With Knurled Texture

Product introduction

This product is a typical custom-made non-standard screw. The head or shaft is equipped with a knurled texture to facilitate manual tightening and adjustment. The shaft is equipped with a flat structure, which can effectively prevent rotation after installation and achieve precise positioning.

As special head screws, the products are made of 304 or 316 stainless steel. They have excellent corrosion resistance and strictly controlled dimensional tolerances. They are precision electronic screws and are widely used in smartphones, laptops, precision instruments, medical equipment and other scenarios.

We specialize in customized services for non-standard fasteners and can provide a variety of knurling types, flat structures and head designs. As customized special shape fastener parts, we support small batch samples and large batch supply. Welcome to inquire about drawings.

 

Product features

Knurling design: The surface of the head or shaft is equipped with straight, mesh or twill knurling to increase the friction when fingers or tools come into contact, making it easy to tighten and adjust manually without the need for additional tools;

Flat position anti-rotation structure: The shaft is equipped with a flat position (single flat, double flat or square flat), which can be positioned with the flat hole of the mating part during installation, effectively preventing the screw from rotating during use;

Precision dimensional control: As precision electronic screws, their dimensional tolerances are strictly controlled to ensure reliable assembly in micro electronic equipment and precision instruments;

Stainless steel material: Made of high-quality stainless steel, it has good corrosion resistance and can be used in humid or corrosive environments without additional surface treatment;

Diversified head shapes: Can be matched with various head shapes such as round head, flat head, knurled head, hand-tightened head, etc. to adapt to different assembly needs and operating habits.

 

Materials and application fields

304 stainless steel: general-purpose austenitic stainless steel, with good corrosion resistance and comprehensive mechanical properties, suitable for most indoor and outdoor environments;

316 stainless steel: Added molybdenum element makes it more resistant to chloride ion corrosion and is suitable for high-corrosion environments such as coastal areas, marine engineering, and chemical equipment;

303 stainless steel: high sulfur content, excellent cutting performance, suitable for complex structures that require precision machining;

410/420 stainless steel: martensitic stainless steel, which can increase its hardness through heat treatment and is suitable for scenes with special requirements for strength.

 

Application areas:

Precision electronics: Precision electronic screw application scenarios such as smartphones, tablets, digital cameras, laptops, etc., used for parts such as battery covers and casings that need to be manually disassembled and assembled;

Instrumentation: panel fixing and adjustment of multimeters, oscilloscopes, measuring instruments and other equipment;

Medical devices: surgical instruments, diagnostic equipment, monitors and other equipment that require high precision and corrosion resistance;

Optical equipment: adjustment and tightening of optical instruments such as cameras, projectors, microscopes, etc.;

Audio equipment: panel screws and knobs of power amplifiers, mixers, and audio equipment;

Industrial equipment: fastening and positioning of control panels, operating handles, and manual adjustment mechanisms.

 

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;

Dimensional accuracy control: Key dimensions (knurl outer diameter, knurl length, flat size, flat length, thread specification, total length) are fully inspected or AQL spot-checked using professional measuring tools such as image measuring instruments, projectors, pass-and-stop gauges, etc. to ensure the tolerance requirements of precision electronic screws;

 

Knurling quality control:

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

The knurling depth and angle meet the design requirements;

The transition between the knurled area and the head or shaft is smooth;

Flat position accuracy control: The flat position size and symmetry are detected using special measuring tools to ensure the positioning accuracy of the mating parts;

Mechanical property testing: including tensile strength, hardness, and torque testing to ensure that the performance requirements specified by the customer are met;

Corrosion resistance test: According to the application environment requirements, neutral salt spray test reports ranging from 72 hours to 1000 hours are provided;

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 non-standard fasteners has complete traceability.

 

Customized services

Size customization: Thread specifications (metric M1.0~M12, imperial, American), knurl outer diameter, knurl length, flat size, flat length, and total length can all be customized according to customer drawings or samples;

Head type customization: As special head screws, special head types such as round head, flat head, countersunk head, knurled head, hand screw head, T-shaped head, mushroom head, etc. can be customized;

Knurling type customization: straight knurling: suitable for axial anti-skid; textured knurling: suitable for multi-directional anti-skid; twill knurling: suitable for anti-skid in specific directions; partial knurling: only some areas are knurled, and the rest is smooth;

Flat structure customization: single flat position: realizes single-directional positioning; double flat position: realizes two-way positioning; square flat position: realizes four-way positioning or higher anti-rotation torque; special-shaped flat position: special shapes such as ellipse and hexagon;

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

Customized surface treatment: stainless steel natural color, passivation, electrolytic polishing, brushing, mirror polishing, black chrome plating, etc.;

Packaging method: Anti-static packaging, tape packaging, customized labels, bulk or pallet packaging can be provided to meet the needs of automated assembly lines.

 

FAQ

Q: What are flat knurled screws? How is it different from ordinary screws?

A: The flat knurled screw has a flat structure (single flat, double flat or square flat) on the shaft, which can be positioned with the flat hole of the mating part during installation to prevent rotation; at the same time, the head or shaft is equipped with a knurled texture to facilitate manual tightening. Ordinary screws do not have these two functions. Therefore, it is a special head screw that provides an integrated solution for manual adjustment and anti-rotation positioning.

 

Q: Is this screw a standard part?

A: No. Flat knurled screws are non-standard fasteners. There are no unified standard specifications on the market. They need to be customized and produced according to the customer's specific size, knurling type, flat structure and other requirements.

 

Q: What is the function of knurling?

A: Knurling increases surface friction, making it easier for fingers to tighten or adjust the screws directly without using a screwdriver. At the same time, knurling also has a certain decorative effect and enhances the appearance and texture of the product.

 

Q: How to ensure the accuracy of the flat structure?

A: We use precision CNC processing equipment, the flat dimensional tolerance can be controlled within ±0.05mm, and the symmetry can be controlled within 0.05mm. Each batch of products is inspected using an image measuring instrument to ensure the positioning accuracy of customized special-shaped fastener parts.

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