M4 x 40mm Hex Socket Head Screws Cap Bolt, 50 Pack 12.9 Grade Carbon Steel Hexagon Socket Screw with Hex Wrenches

Hexagon socket screws have good rust resistance and are durable. Head Cap Screws Bolts are widely used in mechanical equipment, automobile manufacturing, furniture assembly, mechanical maintenance, household appliances, electronic products, etc.

Specification:
Material: Carbon Steel
Thread Length: 40 mm/1.57 inch
Thread Diameter: 4 mm/0.16 inch
Thread Pitch: 0.7 mm/0.03 inch
Hex Drive Width: 3 mm/0.12 inch
Head Diameter: 7 mm/0.28 inch
Hex Spanner Length: 59 mm/2.32 inch
Package List: 50 Pack M4 Screws + 1 Pack Hex Spanner

Advantage:
Socket head screws are made of 12.9 grade carbon steel, with good anti-rust performance and durability. The standard hexagon socket has uniform force, a good fastening effect, is not easy to deform and slide during installation, and can withstand large loads; the thread is deep, the pitch is uniform, the surface is smooth, and there are no burrs.

Instruction:
Just use the matching hexagon wrench to insert the screw hole, turn it clockwise; apply appropriate force to ensure that the hex socket is firmly fixed.

NOTE: When using the M4 socket head screws, avoid over-tightening to avoid damaging the screw or the object being fixed.