BS 7715:1994

This standard BS 7715:1994 Specification for prevailing torque type bolts, screws and studs with non-metallic prevailing torque elements 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 prevailing torque type bolts, screws and studs, with non-metallic prevailing torque elements incorporated into the thread, when tested at an ambient room temperature between 15 °C and 30 °C.

It applies to bolts, screws and studs:

1. with ISO metric coarse pitch M4 to M24 threads in conformance with BS 3643-2:1981;
2. with specific strength requirements conforming to either BS 6104-3:1981, BS 6105:1981 or BS EN 20898-1:1992 as appropriate;
3. with threads of tolerance class 6 g or 4 h in conformance with BS 3643-2:1981;
4. for application into a mating component with a thread of tolerance class 6H in conformance with BS 3643-2:1981;
5. for use within the temperature range – 50 °C to + 120 °C;
6. with specific torque/clamping force requirements in conformance with BS 7371-2:1993.

The torque/clamping force requirements do not apply to set screws and similar threaded fasteners with physical properties in conformance with BS 6104-3:1981.

NOTE 1 Capability to provide a pressure or liquid seal is not within the requirements of this standard.

NOTE 2 Performance at temperatures outside the operating range is not within the requirements of this standard.

NOTE 3 Performance of bolts, screws and studs for which a lubricated coating is not permissible is not within the requirements of this standard.