The fastener screws are commonly classified according to different types of use

Update:30-09-2019
Summary:

The fastener screws are commonly classified according t […]

The fastener screws are commonly classified according to different types of use: self-tapping screws, wall plate nails the Chinese standard parts nets share these kinds of fastener screws according to specific understanding. Reference standard, head type and use.

Self-tapping screws
According to the reference standard, the American self-tapping screw reference standard is ANSI/ASME B18.6.4, and the metric reference standards are GB845, G8846, JIS B115, JISB1122, JISB, JISB1127, JIS B1125, DIN7971, DIN7972, DIN7973, DIN7981, DIN7982, DIN7983, 1SO1479, 1SO1481, 1SO1482, 1SO1483, 1SO7049 (P+), 1SO7050 (F+), 1SO7051

Head type: New and old international have three head types: the old national standard is round head, countersunk head and semi-sunk head, the new national standard has pan head, countersunk head and semi-sunk head, and the British self-tapping nail has various head types.

Wall plate nails
Reference standards, JIS B 1125, GB/T 14210-93C and customer specified standards.

Head type: At present, the wall plate head type has a head (DW). But there are also big flat heads (TW) and Warwick heads (AF).

Wallboard nails mainly have two types of teeth. For fine and coarse teeth, the distance between the teeth and the teeth is shown in the table below. The fine teeth are divided into double teeth and double teeth, as well as high and low teeth, and the coarse teeth are single teeth.
Under normal conditions, the angle of the mountain is 60°, and the angle of the tip is 25°±30°. However, some residents are more inclined to 45°±50°.

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