Standard: BS 3692 (British Standard for precision hexagon bolts, screws, and nuts)
Thread Size: M39 (Metric thread, 39 mm nominal diameter)
Thread Pitch (Coarse): 4.0 mm (fine pitch options like M39×3.0 are available)
Thread Type: ISO metric, 60° thread angle
Bolt Types Covered: Hex bolts, hex screws, and set screws
Material Grades: Typically available in property classes 8.8, 10.9, or stainless steel
Tolerances: External thread tolerance 6g (standard metric fit)
Head Type: Hexagonal (per BS 3692 dimensional specs)
Applications: Mechanical and structural engineering, marine, oil & gas, heavy machinery, infrastructure
M39 Bolt – BS 3692 Standard
