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BS 2A 122; 2A 123; 2A 124:1981

Current
Current

The latest, up-to-date edition.

Specification for clinch nuts (Unified threads) for aircraft
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

12-31-1981

Publisher

British Standards Institution

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.

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:

  1. −75°C to +200°C - Cadmium plated steel nuts;
  2. −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.

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

BS 3A 102:1962 Specification for steel bolts (Unified hexagons and Unified threads) for aircraft
BS 3S95(1967) : 1967 SPECIFICATION FOR 1[1/2] PER CENT NICKEL-CHROMIUM-MOLYBDENUM STEEL - (880/1080 MPA: LIMITING RULING SECTION 150 MM)
DEF 2331 : A AMD 3 PROTECTIVE PX 1 DYED AND UNDYED
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)
BS 2874:1969 Specification for copper and copper alloys. Rods and sections (other than forging stock)
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
BS 1580-3:1965 Specification for Unified screw threads Diameters below ¼ in
DEFSTAN 03-8/2(1992) : 1992 ELECTRO-DEPOSITION OF TIN
BS 3488:1962 Specification for technical anhydrous lanolin
BS S 154:1976 Specification. 2½% nickel-chromium-molybdenum steel billets, bars, forgings and parts (880-1080 MPa: limiting ruling section 150 mm)
BS 3A125 TO 3A[...](1981) : 1981 AEROSPACE SERIES - SPECIFICATION FOR STIFFNUTS (UNIFIED THREADS) FOR AIRCRAFT
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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Hardcopy - English
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