BS 7842:1996
Current
The latest, up-to-date edition.
Bolts, screws and studs with pre-applied thread sealing feature incorporated into the thread
Hardcopy , PDF
English
15-04-1996
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Committees responsible
Foreword
Specification
1 Scope
2 Normative references
3 Definitions
4 Protective coatings
5 Pre-applied sealing feature
6 Materials and lubrication
7 Mechanical properties and performance
Annexes
A (normative) Testing
Tables
A.1 Prevailing torque
Figures
1 Position of pre-applied sealing feature
2 Diameter of pre-applied sealing feature
List of references
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 degrees C and 30 degrees C. Does not cover: performance of bolts, screws and studs for which a lubricated or protective coating is not permissible; performance at temperatures outside the operating range; performance of taper threaded components.
| Committee |
FME/9
|
| DevelopmentNote |
Supersedes 95/700437 DC. (10/2005) Reviewed and confirmed by BSI, January 2012. (12/2011)
|
| DocumentType |
Standard
|
| Pages |
10
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
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:
- with ISO metric coarse pitch M4 to M24 threads conforming to BS 3643 : Part 2 : 1981;
- with specific strength requirements conforming to either BS 6104 : Part 3 : 1981, BS 6105 : 1981 or BS EN 20898-1 : 1992, as appropriate;
- with threads of tolerance class 6g or 4h conforming to BS 3643 : Part 2 : 1981;
- for application into a mating component with a thread of tolerance class 6H conforming to BS 3643 : Part 2 : 1981;
- for use within the temperature range - 50 °C to + 150 °C.
The following are not covered in the scope of this standard:
- performance at temperatures outside the operating range;
- performance of bolts, screws and studs for which a lubricated or protective coating is not permissible;
- performance of taper threaded components.
| BS 328-5:1983 | Drills and reamers Specification for the dimensions of countersinks and counterbores |
| BS 6104-3:1981 | Mechanical properties of fasteners Specification for set screws and similar threaded fasteners not under tensile stresses |
| BS EN 20273:1992 | Fasteners. Clearance holes for bolts and screws |
| BS 328-6:1992 | Drills and reamers Countersinks, 90°, with parallel shanks and solid pilots |
| 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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