Heavy Duty M4 Screws Kit Featuring 1260 Piece Metric Bolt Assortment With Hex Socket Button And Cap Heads Plus Tough Washers Nuts And Wrenches For Heavy Use Garage And Auto Jobs

1260 Piece M4 Metric Bolt & Screw Kit for Shop Use
✔️ 10.9 & 12.9 grade steel with flat washers and drivers

This heavy duty fastener collection packs over twelve hundred pieces designed for tough garage work and auto repair jobs. The assortment delivers reliable metric sizing that keeps wheels, brackets, and machinery secure under heavy vibration. Built from hardened carbon steel, these hardware pieces handle high torque loads without stripping threads or bending under strain.

✅ 10.9 and 12.9 grade black oxide steel construction
✅ M4 thread pitch spanning 6mm length up to 40mm reach
✅ Includes matching hex nuts flat washers and Allen wrenches
✅ Grid storage case keeps every piece organized and visible

💡 What grade steel works best for high torque motorcycle and automotive assemblies?

A handy inventory of complete metric hardware keeps serious DIY shops running smooth.

- 12.9 grade steel delivers maximum tensile strength for critical suspension mounts and drivetrain joints - 10.9 tempered carbon cores provide solid fatigue resistance for exhaust hangers and reinforced brackets - Hardened alloy compositions resist shear forces when pushing hardware past factory preload specifications - Correct tightening sequences prevent vibration loosening across varied thermal cycles and rough pavement conditions✝️