Bolt Extenders – Specification

Internal thread diameter (d)*	Pitch of thread	External diameter, shank diameter (D)	Nominal length, ref. (m)	Minimum tensile strength**
d	p	D	mm	kN
M12	1.75	M20	60	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	120	466
M33	3.5	M45	120	576
M36	4	M48	120	678

Bolt extenders are manufacturer from Grade 8.8 Carbon Steel blank bolts.
Other grades and type of steel may be considered.

*) Internal thread to suite self-colour bolts, studs or square-square bolts (sqsq bolts). For thick finish (like galvanising) internal thread is tapped oversize to suite.

**) minimum tensile strength based on a minimum of six full threads screwed into an internal thread on both sides of the bolt extender