A2 A4 Fasteners Phillips Drive Hex Head Machine Screws With Washer

Description:

The combination screws are made of iron and stainless steel.Iron is the use of different iron screw wire.The wire rod of general combination screw is 1010,1018,10, B21, etc.10B21 is used for making 8.8-level combination screw.Like 8.8 inner hexagon combination screw, commonly used 10B21 wire to do.After it's done, it's heat treated.After heat treatment, remove hydrogen and electroplate.This is to prevent the hexagon combination screw spring pad fracture.Stainless steel combination screw, combination screw market, generally refers to the stainless steel SUS304 combination screw.201 combination screw generally do very little.Few combination screw manufacturers produce 201 combination screws.Because the hardness of stainless steel 201 screws is not easy to control, it is easy to produce cracks.Still have a kind of commonly used is outer hexangular combination screw, this kind is cross outer hexangular combination screw.Often called socket hexagon combination screw.Country number GB9074.13.

Specification:

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