Standard: BS 3692 (British Standard for precision hexagon bolts, screws, and nuts)
Thread Size: M4 (Metric thread, 4 mm nominal diameter)
Thread Pitch (Coarse): 0.7 mm (fine pitch option: M4×0.5)
Thread Type: ISO metric, 60° thread angle
Bolt Types Covered: Hex bolts, hex screws, and set screws
Material Grades: Commonly available in 8.8, A2/A4 stainless, mild steel, or brass
Tolerances: External thread tolerance 6g (standard medium fit)
Head Type: Hexagonal (BS 3692 standard dimensions)
Applications: Used in electronics, small appliances, instruments, precision mechanisms, light enclosures
M4 Bolt – BS 3692 Standard
