• BS 2A 122; 2A 123; 2A 124:1981

    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:  31-12-1981

    Publisher:  British Standards Institution

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    Table of Contents - (Show below) - (Hide below)

    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

    Abstract - (Show below) - (Hide below)

    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.

    Scope - (Show below) - (Hide below)

    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.

    General Product Information - (Show below) - (Hide below)

    Committee ACE/12
    Development Note 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)
    Document Type Standard
    Publisher British Standards Institution
    Status Current
    Supersedes

    Standards Referencing This Book - (Show below) - (Hide below)

    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) : AMD 3283 COPPER AND COPPER ALLOY 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 1/4 IN AND LARGER
    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 1/2 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 3B11(1933) : 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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