|Internal thread diameter*|
|Pitch of thread|
|External diameter, shank diameter|
|Minimum tensile strength**|
|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). For hot-dip galvanised finish, the internal thread is tapped oversize 6AZ (to suite standard galvanised bolts with thread class 6g). Coarse thread.
**) Minimum tensile strength based on a minimum of 45% (of the bolt extender length) of threads screwed into an internal thread on both ends of the bolt extender.
Bolt extenders are manufactured from Grade 8.8 Carbon Steel bolt blanks as standard.
Other grades, types of steel and lengths may be considered.
We can make bolt extenders to your needs. Above is a general specification for a typical extender. If you need an extender to make to the specific requirements contact our sales team and together with our engineers, we can make it happen.↫ Go back