1640PCS M4 M6 M5 Bolts and Nuts Assortment Kit Grade 8.8 Alloy Steel Hex Screws
Specification： Material: 8.8 Grade Alloy Steel Thread Size: M4, M5, M6 Head Style: Hex Quantity: 1640 Tolerance: 0.005mm Feature: Material: Bolts and Nuts assortment sets are made of 8.8 Grade Alloy Steel, corrosion resistance property, features good wear resistance, high hardness and high strength. But they are not suitable for outdoor or humid environments. Standard size(Tolerance:±0.005mm): Uniform force, located in the center of the head with no offset, not easy to slip; Uniform pitch, obvious screw thread, no residual burrs, the set screw threads will be able to get a good grip. (Pitch Size: M4*0.7mm、M5*0.8mm、M6*1.0mm) .