BS 7715:1994
Current
The latest, up-to-date edition.
Specification for prevailing torque type bolts, screws and studs with non-metallic prevailing torque elements incorporated into the thread
Hardcopy , PDF
English
15-01-1994
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Committees responsible
Foreword
Specification
1 Scope
2 References
3 Definitions
4 Protective coatings
5 Prevailing torque element dimensions
6 Materials and lubrication
7 Mechanical properties and performance
Annex
A (normative) Torque testing
Tables
A.1 Spacer dimensions
A.2 Performance requirements
Figures
1 Position of prevailing torque feature
2 Diameter of prevailing torque feature
List of references
Specifies the coatings, materials, 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 of 15 degrees C to 30 degrees C. Coverage includes: mechanical properties and performance; materials and lubrication; prevailing torque element dimensions. Also gives definitions, tables and diagrams.
| Committee |
FME/9
|
| DevelopmentNote |
Supersedes 93/702726 DC (10/2005) Reviewed and confirmed by BSI, October 2012. (09/2012)
|
| DocumentType |
Standard
|
| Pages |
12
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
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:
- with ISO metric coarse pitch M4 to M24 threads in conformance with BS 3643-2:1981;
- with specific strength requirements conforming to either BS 6104-3:1981, BS 6105:1981 or BS EN 20898-1:1992 as appropriate;
- with threads of tolerance class 6 g or 4 h in conformance with BS 3643-2:1981;
- for application into a mating component with a thread of tolerance class 6H in conformance with BS 3643-2:1981;
- for use within the temperature range – 50 °C to + 120 °C;
- 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.
| BS 7371-1:1991 | Coatings on metal fasteners Specification for general requirements and selection guidelines |
| BS 6104-3:1981 | Mechanical properties of fasteners Specification for set screws and similar threaded fasteners not under tensile stresses |
| BS EN 20898-2:1994 | Mechanical properties of fasteners Nuts with specified proof load values. Coarse thread |
| BS EN 20273:1992 | Fasteners. Clearance holes for bolts and screws |
| BS 1134-2:1990 | Assessment of surface texture. Guidance and general information |
| BS 7371-2:1993 | Coatings on metal fasteners Specification for torque/clamping force relationship |
| BS EN 20898-1:1992 | Mechanical properties of fasteners Bolts, screws and studs |
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