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BS A 293:1983
Withdrawn
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Specification for procurement of self-locking nuts with non-metallic locking element. Metric series
Hardcopy , PDF
22-02-2005
English
30-09-1983
Foreword
Committees responsible
Specification
1 Scope
2 Definitions
3 Requirements and test methods
3.1 Materials
3.2 Dimensions
3.2.1 General
3.2.2 Threads
3.2.3 Squareness
3.3 Manufacture
3.3.1 Nut bodies
3.3.2 Anchor nut blanks
3.3.3 Heat treatment
3.3.4 Surface texture
3.3.5 Surface protection
3.3.6 Lubrication
3.4 Metallurgical properties
3.4.1 Discontinuities
3.4.2 Magnetic permeability (applicable to corrosion
resisting steel nuts only)
3.5 Product performance
3.5.1 Axial tensile strength
3.5.2 Wrench torque (applicable to wrenchable type
nuts only)
3.5.3 Push out (applicable only to anchor nuts and
clinch nuts)
3.5.4 Torque out (applicable only to anchor nuts and
clinch nuts)
3.5.5 Permanent set
3.5.6 Accelerated environmental reusability
3.5.7 Reusability
3.5.7.1 Qualification approval
3.5.7.2 Production acceptance
3.5.8 Contamination
3.5.9 Breakaway torque after heat soak
3.5.9.1 At maximum operating temperature
3.5.9.2 At minimum operating temperature
3.5.10 Accelerated vibration (applicable only to
thread sizes MJ5 to MJ12)
3.5.10.1 At ambient temperature
3.5.10.2 At ambient temperature after heat soak at
maximum operating temperature
3.5.11 Flareability (clinch nuts only)
3.6 Product identification
4 Quality assurance and product qualification
test requirements and approval
4.1 Quality assurance approval
4.2 Product qualification testing approval
4.3 Classification of tests
4.3.1 General
4.3.2 Qualification approval test samples
4.3.3 Production acceptance tests
4.3.3.1 General
4.3.3.2 Rejection and re-test
5 Packing, packaging and labelling
5.1 Prevention of damage
5.2 Unit package
5.3 Labelling
6 Inspection
7 Production acceptance test report
Appendix
A Axial loads and torque values for thread sizes
M8 x 1.25, M10 x 1.5 and M12 x 1.5
Tables
1 Qualification approval testing requirements
for self-locking nut samples
2 Qualification and production acceptance tests
3 Discontinuity depths
4 Axial load values
5 Maximum assembly and wrench torque test values
6 Maximum locking torque, minimum breakaway
torque, assembly torque (vibration), push out
and torque out values
7 Classification of defects
8 Sampling data for visual and dimensional
characteristics
9 Sampling data for mechanical and metallurgical
characteristics
10 Contaminants
11 Maximum assembly and wrench torque test values
for thread sizes M8 x 1.25, M10 x 1.5 and M12
x 1.5
12 Axial load values for thread sizes M8 x 1.25,
M10 x 1.5 and M12 x 1.5
13 Torque out values for thread sizes M8 x 1.25,
M10 x 1.5 and M12 x 1.5
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