410 stainless steel cross countersunk head drilling tail self tapping self drilling screw, color steel tile self tapping wood screw

"Standard Spring Washers (GB/T93-1987) Light Spring Washers (GB/T859-1987) Heavy Spring Washers (GB/T7244-1987) Spring Washers, also known as Spring Mesons. Saddle Spring Washers (GB/T 7245-1987) Saddle Spring Washers (GB/T 860-1987) Wave Spring Washers (GB/T 7246-1987) Wave Spring Washers (GB/T 955-1987) ^ ^ ^ ^ Common Categories Various Common Screws Various Common Screws (20 pieces) a Slotted: Minus b Phillips: Plus c Phil Slot: straight/cross d Hex Socket: Inner hexagonal e One Way: One Way (only lockable, cannot exit) A-4: Head Code/Head Appearance. a. Flat: Flat Head (after locking, the top is flush with the working part) b Oval: salad head, O head, half countersunk head screw Unit of measurement screw Unit of measurement c Round: Round head d Pan: Round flat head e Truss: Large round flat head f Hex: hexagonal head. A-5: Finish Code/Appearance treatment. Metric Self-tapping screw: directly mark Tapping Type after the product name. Ex: M3 x 6 – PPB, Tapping Type: M3 Self-tapping screw, 6mm long, cross, round flat head, black plating. Generally, it is judged to be used by Sheet Metal or plastic parts according to the product type or mark, When inspecting, the focus should be on the head and guide part of the double head bolt. It is also necessary to strictly inspect each part of the thread for cracks or dents, and to check the tooth shape of the double head bolt for any changes. Is there any abnormality in the pitch? If there is any abnormality, it must not be used again. When installing the connecting rod cap, a torque wrench should be used as a tool. It is necessary to tighten according to the specified standards, and the torque should not be too large or too small. It is also important to choose the matching manufacturer's double head bolts and double head studs.