BS 7842:1996

This standard BS 7842:1996 Bolts, screws and studs with pre-applied thread sealing feature incorporated into the thread is classified in these ICS categories:

• 21.060.10 Bolts, screws, studs

This British Standard specifies the coatings, dimensions, materials, lubrication and performance requirements for bolts, screws and studs with a pre-applied sealing feature incorporated into the thread, when tested at a temperature between 15 °C and 30 °C.

It applies to bolts, screws and studs:

1. with ISO metric coarse pitch M4 to M24 threads conforming to BS 3643 : Part 2 : 1981;
2. with specific strength requirements conforming to either BS 6104 : Part 3 : 1981, BS 6105 : 1981 or BS EN 20898-1 : 1992, as appropriate;
3. with threads of tolerance class 6g or 4h conforming to BS 3643 : Part 2 : 1981;
4. for application into a mating component with a thread of tolerance class 6H conforming to BS 3643 : Part 2 : 1981;
5. for use within the temperature range - 50 °C to + 150 °C.

The following are not covered in the scope of this standard:

1. performance at temperatures outside the operating range;
2. performance of bolts, screws and studs for which a lubricated or protective coating is not permissible;
3. performance of taper threaded components.