Stainless Steel Knurled Screw

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In the field of precision assembly and efficient maintenance, high-performance 1/4-20×13.5 stainless steel headless knurled thumb screws, hereinafter referred to as stainless steel knurled screws, are designed for scenarios that require tool-free operation, corrosion resistance and reliable fastening. This product combines the precision craftsmanship of American standards with special ergonomic design, making it an ideal choice for industries such as electronic equipment, medical equipment, and outdoor facilities.

Product Specifications: The product strictly follows the American screw standards, with specific specifications of 1/4 inch diameter and 20 threads per inch fine thread (1/4-20 UNC). The fine thread design can provide higher vibration resistance and more precise torque control, especially suitable for the connection needs of thin-walled materials or precision parts. The thread profile adopts a 60-degree angle design and a flattening height of H/8 to ensure full compatibility with standard American nuts and threaded holes.

Product Picture

 

Innovative structural design
Headless knurled cylinder: Different from traditional slotted screws, this product adopts a headless design with a full cylindrical knurled structure at the end. The unique pineapple knurling on the surface can provide up to a 40% increase in friction, making hand tightening operations more labor-saving.

Stainless steel material: 304/316 stainless steel is used. Through cold heading and solution treatment, its performance parameters are significantly enhanced; tensile strength: ≥500 MPa, hardness level reaches 70-80 HRB

Corrosion resistance has also made a significant breakthrough and can pass the 96-hour salt spray test (meeting ASTM B117 standard)

Surface finishing: optional passivation or electrolytic polishing of the surface, reducing microparticle residue, and meeting the cleanliness requirements of medical and food equipment.

Industry application tips: This specification is a common size for American cabinet screws, especially suitable for fixing electronic chassis with panel thickness ≤2mm, and can achieve a firm connection without nuts.

Raw Material

Cold Forging

Threading

Auto Lathe

Auto Lathe

Table Lathe

CNC Lathe

Quality Checking

Inspection

Packing

Core features

Tool-free operation design: The diameter of the knurled cylinder is optimized to 5mm, which conforms to the ergonomic grip comfort zone. It can be easily screwed even when wearing gloves or in an oily environment, and the installation efficiency is 50% higher than that of traditional hexagonal screws. The headless design saves 35% of axial space, solving the pain point that tools cannot enter the narrow equipment compartment, and is particularly suitable for avionics equipment maintenance and dense server cabinet wiring. This reflects its advantages of rapid disassembly and assembly and good spatial adaptability.

Excellent corrosion resistance: 304/316 stainless steel substrates maintain corrosion resistance in marine equipment, medical disinfection environments and high temperature and humidity conditions, and the service life is 3-5 times longer than that of carbon steel screws. In addition, optional Teflon coating or nickel plating can further enhance chemical corrosion resistance, which is suitable for ship hardware and chemical equipment fastening.

High strength and fatigue resistance: The cold heading process makes the metal streamline complete, and the shear strength is increased by about 30% compared with the cutting process, which can meet the vibration environment requirements of industrial equipment. In addition, through 650℃ stress annealing treatment, the internal stress of cold processing is eliminated to avoid brittle fracture in a chloride ion environment.

Clipers Micrometer

Torque

Depth Micrometer

Plug

Thread Guage

Ring Guage

Hardness Tester

Projector

Salt Spray Testing

Anti-slip and grip optimization: The cross-twill pineapple pattern is adopted, and the two-way screwing does not slip, balancing anti-slip and cleaning convenience. The edges are chamfered to prevent scratches on cables or operators' hands during installation, improving operational safety.

Application scenarios
Electronic communication equipment: rack panel fixing and PCB isolation installation.

Medical and laboratory instruments: aseptic compliance operation and resistance to chemical disinfectants.

Harsh environment facilities: The 316L ultra-low carbon stainless steel version is used for ship radar bracket fixing and coastal guardrail fastening. It is also suitable for automobile engine compartment sensor installation or refrigeration equipment repair panel because of its high and low temperature resistance.

Customized service
Size and structure customization
Non-standard size supply: Stainless steel knurled screws support diameter and length customization to meet the hole requirements of special equipment.