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
HNBA0 0BA HEX FULLNUT
3900 In Stock for despatch
Price Unavailable
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HNBA08 8BA HEX FULLNUT
Out of Stock
£41.48 (exc VAT) per HUND
£49.78 (inc VAT)
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HNBA1 1BA HEX FULLNUT
400 In Stock for despatch
Price Unavailable
-
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HNBA2 2BA HEX FULLNUT
997 In Stock for despatch
£2.57 (exc VAT) per HUND
£3.08 (inc VAT)
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HNBA2P 2BA HEX FULLNUT ZINC PLATED
Out of Stock
£6.83 (exc VAT) per HUND
£8.20 (inc VAT)
-
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HNBA3 3BA HEX FULLNUT
2068 In Stock for despatch
Price Unavailable
-
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HNBA4 4BA HEX FULLNUT
1536 In Stock for despatch
£1.48 (exc VAT) per HUND
£1.78 (inc VAT)
-
+
HNBA4P 4BA HEX FULLNUT ZINC PLATED
Out of Stock
£2.52 (exc VAT) per HUND
£3.02 (inc VAT)
-
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HNBA5 5BA HEX FULLNUT
1000 In Stock for despatch
Price Unavailable
-
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HNBA6 6BA HEX FULLNUT
Out of Stock
£3.47 (exc VAT) per HUND
£4.16 (inc VAT)
-
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HNBA6P 6BA HEX FULLNUT ZINC PLATED
Out of Stock
£2.52 (exc VAT) per HUND
£3.02 (inc VAT)
-
+
HNBA8P 8BA HEX FULLNUT ZINC PLATED
Out of Stock
£2.21 (exc VAT) per HUND
£2.65 (inc VAT)
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