BA THREAD

BA THREAD

BA (British Association) threads are a British standard for small screws and fasteners, primarily used in precision instruments, model engineering, and legacy electrical equipment. Unlike metric threads, they are designated by a number (e.g., 0BA, 2BA, 4BA), where a higher number indicates a smaller diameter. 

Key Characteristics

  • Thread Angle: BA threads have a unique, symmetrical V-profile with a 47.5° flank angle. This differs from the 60° angle used by metric and Unified threads, making them non-interchangeable.
  • Thread Profile: The threads feature rounded crests and roots to reduce stress concentrations and enhance durability in delicate applications.
  • Sizing System: The system is based on a geometric progression, with the pitch of each successive size (higher number) being approximately 0.9 times the pitch of the lower number.
  • Standardization: They are specified by British Standard BS 93:2008, which defines dimensions and tolerances for sizes 0BA to 16BA. 

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Code Description Price Quantity
BNBA0 O BA BRASS HEX FULLNUT
1100 In Stock for despatch
£45.84 (exc VAT) per HUND
£55.01 (inc VAT)
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BNBA1 1 BA BRASS HEX FULLNUT
114 In Stock for despatch
£170.88 (exc VAT) per HUND
£205.06 (inc VAT)
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BNBA10 10BA BRASS HEX FULLNUT
Out of Stock
£50.00 (exc VAT) per HUND
£60.00 (inc VAT)
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BNBA2 2 BA BRASS HEX FULLNUT
Out of Stock
£59.50 (exc VAT) per HUND
£71.40 (inc VAT)
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BNBA2NP 2BA BRASS HEXAGON FULL NUT NICKEL PLATED.
Out of Stock
£186.20 (exc VAT) per HUND
£223.44 (inc VAT)
-
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BNBA3 3 BA BRASS HEX FULLNUT
900 In Stock for despatch
Price Unavailable
-
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BNBA4 4 BA BRASS HEX FULLNUT
814 In Stock for despatch
£13.90 (exc VAT) per HUND
£16.68 (inc VAT)
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BNBA5 5 BA BRASS HEX FULLNUT
100 In Stock for despatch
£25.00 (exc VAT) per HUND
£30.00 (inc VAT)
-
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BNBA6 6 BA BRASS HEX FULLNUT
1000 In Stock for despatch
£8.84 (exc VAT) per HUND
£10.61 (inc VAT)
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BNBA7 7 BA BRASS HEX FULLNUT
750 In Stock for despatch
£40.00 (exc VAT) per HUND
£48.00 (inc VAT)
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BNBA8 8 BA BRASS HEX FULLNUT
70 In Stock for despatch
£65.00 (exc VAT) per HUND
£78.00 (inc VAT)
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BNBA9 9 BA BRASS HEX FULLNUT
228 In Stock for despatch
£160.14 (exc VAT) per HUND
£192.17 (inc VAT)
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