BS 7814:1995
Current
The latest, up-to-date edition.
Specification for bolts and screws incorporating either underhead locking or anti-rotation features
Hardcopy , PDF
English
15-12-1995
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Committees responsible
Foreword
Specification
1 Scope
2 Normative reference
3 Information and requirements to be agreed and to be
documentated
4 Materials
5 Mechanical properties
6 Test methods
7 Marking
Tables
1 Equivalent property class of fastener from BS EN
20898-1:1992 for material selection
2 Additional mechanical properties for bolts and screws
with underhead locking or anti rotation features
3 Surface hardness for bolts and screws with locking or
anti- rotation features
4 Marking symbols
Figures
1 Examples of marking on hexagon bolts and screws
2 Examples of marking on hexagon socket head
2 Left hand thread marking
List of references
Specifies the materials, mechanical properties and marking requirements for bolts and screws incorporating either underhead locking or anti-rotation features when tested at an ambient temperature between 15 degrees C and 30 degrees C.
| Committee |
FME/9
|
| DevelopmentNote |
Supersedes 94/704978 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 materials, mechanical properties and marking requirements for bolts and screws incorporating either underhead locking or anti-rotation features when tested at an ambient temperature between 15 °C and 30 °C.
It applies to bolts and screws:
- with ISO metric M2 to M20 threads conforming to BS 3643-2:1981;
- with mechanical properties 80, 90 or 1001) as appropriate;
- for use within the temperature range – 50 °C to + 250 °C.
As the decarburization of any underhead locking or anti-rotation feature will seriously impair its intended function, partial or complete decarburization as given in BS EN 20898-1:1992 does not apply to this standard. There is instead a requirement for carbon restoration to ensure that no decarburization of the locking or anti-rotation feature takes place during the heat treatment process.
NOTE Performance at temperatures outside the operating range is not within the requirements of this standard.
| ISO 6507-1:2005 | Metallic materials Vickers hardness test Part 1: Test method |
| ISO 898-7:1992 | Mechanical properties of fasteners Part 7: Torsional test and minimum torques for bolts and screws with nominal diameters 1 mm to 10 mm |
| ISO 6507-2:2005 | Metallic materials Vickers hardness test Part 2: Verification and calibration of testing machines |
| ISO 6507-3:2005 | Metallic materials Vickers hardness test Part 3: Calibration of reference blocks |
| BS EN 20898-1:1992 | Mechanical properties of fasteners Bolts, screws and studs |
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