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What is the uniform standard for fasteners produced by hardware fastener manufacturers

1. The fastener product size standards produced by hardware fastener manufacturers: stipulate the basic size of the product; threaded products, including the basic size of the thread, the thread finish, the shoulder distance, the undercut and chamfer, and the size of the external thread part.

2. Standards for technical conditions of fastener products. It mainly includes product tolerances, mechanical properties, surface defects, surface treatments, product testing standards and corresponding content-specific aspects.

3. Acceptance inspection, marking and packaging standards for screw products: stipulate product quality levels and sampling plans, as well as product marking methods and packaging requirements.

4. Standard parts, fasteners, screws, screw marking method standards: specify a complete product marking method and a simplified marking method.

5. Other standards for fasteners: stainless steel non-standard screws, fastener product weight standards, etc.

Fasteners include: bolts, studs, screws, nuts, washers, and pins. Locking or biting often occurs on fasteners made of stainless steel, aluminum alloy, and titanium alloy. These metal alloys have corrosion resistance, which will form a thin oxide layer on the metal surface to prevent surface damage. Further rust. When the electromechanical hardware screws are locked, the pressure and heat generated between the teeth will damage the oxide layer, causing blockage or shearing between the metal wires, and then adhesion. When this phenomenon continues, the stainless steel non-standard screws will be completely locked and can no longer be removed or remain locked. Usually a series of actions occur within a few seconds, so a correct understanding of the use of such fasteners can prevent this phenomenon.

1. Choose the correct product a. Before use, please confirm whether the mechanical properties of the product meet the use requirements, such as the tensile strength of the screw and the guaranteed load of the nut. The length of the screw should be selected correctly to tighten the nut and expose 1-2 teeth of the nut. Check whether the threads are rough before use. If there are iron filings or dirt between the threads, these will usually cause lock-up. C. Lubricate fasteners before use. It is recommended to use butter, molybdenum disulfide, mica, graphite or talc for lubrication. Usually, it is treated with dipping wax to prevent lubrication.

2. Pay attention to the method of use. One. Accelerate the tightening force should be appropriate, not too large, try to use a torque wrench or socket wrench, avoid the use of adjustable wrenches or electric wrenches. Too fast will cause the temperature to rise rapidly and cause lock-up. The direction of the force applied, the nut must be tightened perpendicular to the axis of the screw. C. The use of washers can effectively prevent the problem of over tightening. The above is provided by Sports Equipment Screw Wholesale Dexin Hardware

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Telephone: 0769-83196635-7
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