BS A 293:1983

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