M20 Bolt – BS 3692 Standard

Standard: BS 3692 (British Standard for precision hexagon bolts, screws, and nuts)
Thread Size: M20 (Metric thread, 20 mm nominal diameter)
Thread Pitch (Coarse): 2.5 mm (fine pitch versions like M20×2.0 or M20×1.5 are also available)
Thread Type: ISO metric, 60° thread angle
Bolt Types Covered: Hex bolts, hex screws, set screws
Material Grades: Typically supplied in 8.8, 10.9, or stainless steel grades
Tolerances: External thread tolerance 6g (standard fit per BS 3692)
Head Type: Hexagonal (head dimensions standardized by BS 3692)
Applications: Widely used in construction, automotive, infrastructure, machines, bridges, and structural steelworks