M3 X 4mm High Tensile(12.9) Black oxide Grub Screw (Dia. 3mm, Length 4mm)

Diameter: 3mm
Length: 4mm
Pitch: 0.5mm
Material: High Tensile
Grade: 12.9
Finish: Black oxide

 Allen Key size used: M1.5(1.5mm)

These high tensile screws (grade 12.9) are designed to withstand high levels of stress and strain, providing reliable performance in demanding applications. They are black oxidized to ensure corrosion resistance and a sleek, professional appearance.

A grub screw is generally used to secure an item against another item. It is commonly used as a locking device, particularly on custom modified Gears, pillow ball bearings, taper locking bushes, pulleys or adjusting rings. 

Grub Screws are designed with a hexagonal internal drive in the head, allowing them to be tightened and loosened with an Allen key.