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Lizhan Flat head self-drilling screws

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The coatings are mainly divided into thin coatings

Thread Self drilling Screws Suppliers for the eligibility of inch and metric threads (UN, UNR, UNJ, M and MJ) Methods' and IF1-166-2007 'Acceptance Regulations for Damaged Threads' 3 standards, which clarify the relevant technical requirements and rules. This is an inteationally advanced and complete set of thread gauges and thread inspection method standards. Figure

Thread Inspection 5. Purpose of Thread Inspection In engineering and industrial applications, there are two main problems with the thread fitting of fasteners: ①Can the inteal and exteal threads be assembled smoothly? That is, the problem of interchangeability or adaptability. ②Can the thread after assembly bear a certain load?

That is the problem of mechanical strength. If the inteal and exteal threads of the fastener cannot be matched, the parts cannot be assembled; if the thread after assembly cannot bear a constant load, or if it is destroyed early after assembly, the function of thread fastening will be lost. Therefore, the accuracy of the thread also determines whether the thread can carry the specified strength. 6. Fastener surface coating and thread inspection. In threaded fasteners,

coating has been widely used. The coatings are mainly divided into thin coatings and thick coatings. Thin coating generally refers to electroplating and non-electrolytic zinc flake coating (Dacromet), etc.; thick coating mainly refers to hot-dip galvanizing and mechanical galvanizing. The influence of the two on the thread size of fasteners is different, and the inspection methods are also different. Because electro-galvanizing has a thin coating on the surface of the fastener thread, and is affected by the 'shielding effect' during the electroplating process, the coating in the inteal threaded hole is relatively thin, and the middle of the thread is thinner than the coating at both ends; exteal threaded bolt head

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