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
SSHNBA0 0BA ST/ST HEX FULLNUT
Out of Stock
£129.70 (exc VAT) per HUND
£155.64 (inc VAT)
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SSHNBA2 2BA ST/ST HEX FULLNUT
108 In Stock for despatch
£16.00 (exc VAT) per HUND
£19.20 (inc VAT)
-
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SSHNBA2D 2BA ST/ST HEX DOME NUT
Out of Stock
£211.50 (exc VAT) per HUND
£253.80 (inc VAT)
-
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SSHNBA4 4BA ST/ST HEX FULLNUT
420 In Stock for despatch
£11.00 (exc VAT) per HUND
£13.20 (inc VAT)
-
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SSHNBA5 5BA ST/ST HEX FULLNUT
Out of Stock
£61.90 (exc VAT) per HUND
£74.28 (inc VAT)
-
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SSHNBA6 6BA ST/ST HEX FULLNUT
Out of Stock
£14.40 (exc VAT) per HUND
£17.28 (inc VAT)
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