M68 Bolt – BS 3692 Standard

Standard: BS 3692 (British Standard for precision hex bolts, screws, and nuts)
Thread Size: M68 (Metric thread, 68mm nominal diameter)
Thread Pitch (Coarse): 6.0 mm (unless otherwise specified as fine thread, e.g., M68×4)
Thread Type: ISO metric thread, generally coarse unless fine pitch is specified
Bolt Types Covered: Hex bolts, hex screws, set screws (usually partially or fully threaded)
Material Grades: Commonly 8.8, 10.9, or high-tensile steel; stainless steel also available
Tolerances: Specified to precision classes (medium/fine), with external thread tolerance 6g
Head Type: Hexagonal (standardized per BS 3692)
Applications: Heavy engineering, structural steel, machinery, marine, and large-scale mechanical assemblies