roduct Introduction

　　American cylinder head tapping screw is also called cylinder head quick tapping screw. It is a kind of fast installation American standard fastener products made of carbon steel and passivated on the surface. The environmentally friendly black zinc used on the surface can greatly enhance the corrosion resistance of the screw, and the rounded cylindrical head will not scratch the hands, and it is very convenient to screw in.

Product parameter

　　 Specification: 2.2-14

　　 Length: 3-180mm

　　Material: carbon steel

　　 head type: cylindrical head

　　Thread type: self-tapping

　　Groove: Hexagon socket

　　 Tensile strength: 450Mpa

　　Surface hardness: ≥450HV

　　Core hardness: 270-390HV

　　Surface treatment: environmentally friendly black zinc