Content with BS 7419 bolt extender

15 June 2018
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)