BS 2A 122; 2A 123; 2A 124:1981
Current
The latest, up-to-date edition.
Specification for clinch nuts (Unified threads) for aircraft
Hardcopy , PDF
English
31-12-1981
Important note : Users cannot be edited or removed once added to your Multi user PDF.
Foreword
Specification
Section one. General requirement
1. Scope
2. Definitions
3. Design and dimensions
4. Material and manufacture
5. Freedom from defects
6. Protective coating
7. Screw threads
8. Identification and marking
Section two. Inspection and testing
9. Qualification approval
10. Production batch acceptance
11. Inspection of samples
12. Testing of samples
13. Test bolts
14. Torque test
15. Bolt tolerance test
16. Endurance test
17. Clinching test
18. High temperature test
19. Low temperature test
Appendices
A. Equipment for testing clinch nuts
B. Fitting of aircraft clinch nuts
Tables
1. Unscrewing torque
2. Minimum torque to turn clinched nut in plate
3. British Standard numbers and materials for clinch
nuts (Unified threads) for aircraft
4. Dimensions and part numbers of clinch nuts (Unified
threads) for aircraft
5. Calibration of spring balances for torque and
torsional strength tests
6. Dimensions for high limit and low limit test bolts
7. Assembling tool dimensions
Figures
1. Dimensions of clinch nuts
2. Torque testing machine
3. Dimensions for high limit and low limit test bolts
4. Recommended method of clinching
Specifies the dimensions, material, finish, testing and identification of aircraft clinch nuts with Unified threads. According to the materials used in their construction the clinch nuts are suitable for use at sustained temperatures within the ranges: -75 to +200 Degrees C - Cadmium plated steel nuts and -75 to + 125 Degrees C - Aluminium alloy, brass or bronze nuts. All nuts are capable of remaining effective for servicing operations at -40 Degrees C. Includes equipment for testing clinch nuts and fitting of aircraft clinch nuts. Illustrates dimensions of clinch nuts, torque testing machine, dimensions for high limit and low limit test bolts and recommended method of clinching.
| Committee |
ACE/12
|
| DevelopmentNote |
Supersedes BS 2A122-124(1959) (07/2004) Supersedes 79/80586 DC (07/2005) Earlier was withdrawn in error by the publisher and now has been reinstated. (01/2013) Reviewed and confirmed by BSI, March 2013. (03/2013)
|
| DocumentType |
Standard
|
| Pages |
15
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
These British Standards cover the dimensions, material, finish, testing and identification of aircraft clinch nuts with Unified threads. According to the materials used in their construction the clinch nuts are classified as satisfactory for use at sustained temperatures within the following ranges:
- −75°C to +200°C - Cadmium plated steel nuts;
- −75°C to +125°C - Aluminium alloy, brass or bronze nuts.
NOTE. All nuts are capable of remaining effective for servicing operations at −40°C.
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| BS 2S 113:1964 | Specification for aircraft material. \'40\' carbon steel bright bars for machining (45-55 tonf/sq in: limiting ruling section 1 inch) (primarily intended for the manufacture of nuts) |
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| DTD 904C : MAY 63 | CADMIUM PLATING |
| DEFSTAN 03-8/1(1973) : 1973 | ELECTRO DEPOSITION OF TIN |
| BS 3A 169:1962 | Specification for aluminium alloy bolts (Unified hexagons and Unified threads) for aircraft |
| DEF 151 : 1965 | ANODIZING OF ALUMINIUM AND ALUMINIUM ALLOYS |
| BS 919-1:1960 | Specification for screw gauge limits and tolerances Gauges for screw threads of Unified form |
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| BS L 102:1971 | Specification for bars and extruded sections of aluminium-copper-magnesium-silicon-manganese alloy (solution treated and aged at room temperature) (not exceeding 200 mm diameter or minor sectional dimension) (Cu 4.4, Mg 0.5, Si 0.7, Mn 0.8) |
| BS 2S 112:1964 | Specification for aircraft material. Semi-free cutting carbon steel, bright bars for machining (40-50 tonf/sq in: maximum size ½ inch diameter or minor sectional dimension) (primarily intended for the manufacture of nuts) |
| BS 1580-1&2(1962) : 1962 | SPECIFICATION FOR UNIFIED SCREW THREADS - DIAMETERS 1/4 INCH AND LARGER |
| DTD 417B : MAR 64 | LUBRICATING OIL, AIRCRAFT CONTROLS: ANTI FREEZING JOINT SERVICES DESIGNATION OM 150 |
| BS 3B 11:1933 | Specification for aircraft material. Brass bars suitable to be brazed or silver soldered |
| BS L 168:1978 | Specification for bars and extruded sections of aluminium-copper-magnesium-silicon-manganese alloy (solution treated and artificially aged) (not exceeding 200 mm diameter or minor sectional dimension) (Cu 4.4, Mg 0.5, Si 0.7, Mn 0.8) |
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