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A chart of Metric Thread Pitches for bolts, studs and other fasteners covering from M1 to M100. Diameter Coarse Pitch M11 0.25 M22 0.4 M33 0.5 M4 0.7 M5 0.8 M6 M7 1 M8 M9 1.25 M10 M11 1.5 Diameter Coarse Pitch M12 1.75 M14 M16 2 M18 M20 M22 2.5 M24 M27 3 M30 M33 3.5 M36 4 Diameter Coarse Pitch M39 3 M42 M45 4.5 M48 M52 5 M56
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Internal thread diameter* d Pitch of thread P External diameter, shank diameter D Nominal length m (ref.) Minimum tensile strength** kN M12 2 M20 100 70 M16 2 M24 100 130 M20 2.5 M30 100 203 M22 2.5 M33 100 252 M24 3 M36 100 293 M27 3 M39 100 381 M30 3.5 M42 100, 120 466 M33 3.5 M45 100, 120 576 M36 4 M48 100, 120 or 150 678 Dimensions in millimetres *) Internal thread class 6H (to suite bolts with thread class 6g) for use with bolts, studs or square square holding down bolts bolts (BS 7419).
Read more about Bolt Extenders – General specification (coarse thread) ↬