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
SKSTBA0037 OBA X 3/8 SOCKET SETSCREW
50 In Stock for despatch
Price Unavailable
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SKSTBA0050 OBA X 1/2 SOCKET SETSCREW
10 In Stock for despatch
Price Unavailable
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SKSTBA2019 2BA X 3/16 SOCKET SETSCREW
3 In Stock for despatch
Price Unavailable
-
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SKSTBA2025 2BA X 1/4 SOCKET SETSCREW
122 In Stock for despatch
£139.40 (exc VAT) per HUND
£167.28 (inc VAT)
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SKSTBA2037 2BA X 3/8 SOCKET SETSCREW
100 In Stock for despatch
Price Unavailable
-
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SKSTBA2050 2BA X 1/2 SOCKET SETSCREW
156 In Stock for despatch
Price Unavailable
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SKSTBA2075 2BA X 3/4 SOCKET SETSCREW
150 In Stock for despatch
Price Unavailable
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SKSTBA2087 2BA X 7/8 SOCKET SETSCREW
200 In Stock for despatch
Price Unavailable
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SKSTBA2100 2BA X 1" SOCKET SETSCREW
50 In Stock for despatch
Price Unavailable
-
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SKSTBA2125 2BA X 1.1/4 SOCKET SETSCREW
50 In Stock for despatch
Price Unavailable
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SKSTBA3019 3BA X 3/16 SOCKET SETSCREW
30 In Stock for despatch
Price Unavailable
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SKSTBA3037 3BA X 3/8 SOCKET SETSCREW
5 In Stock for despatch
Price Unavailable
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SKSTBA4012 4BA X 1/8 SOCKET SETSCREW
20 In Stock for despatch
Price Unavailable
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SKSTBA4019 4BA X 3/16 SOCKET SETSCREW
20 In Stock for despatch
Price Unavailable
-
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SKSTBA4025 4BA X 1/4 SOCKET SETSCREW
Out of Stock
£17.60 (exc VAT) per HUND
£21.12 (inc VAT)
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SKSTBA4037 4BA X 3/8 SOCKET SETSCREW
100 In Stock for despatch
£30.00 (exc VAT) per HUND
£36.00 (inc VAT)
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SKSTBA4050 4BA X 1/2 SOCKET SETSCREW
16 In Stock for despatch
Price Unavailable
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SKSTBA4100 4BA X 1" SOCKET SETSCREW
Out of Stock
£111.30 (exc VAT) per HUND
£133.56 (inc VAT)
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SKSTBA6012 6BA X 1/8 SOCKET SETSCREW
Out of Stock
£87.50 (exc VAT) per HUND
£105.00 (inc VAT)
-
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SKSTBA6019 6BA X 3/16 SOCKET SETSCREW
Out of Stock
Price Unavailable
-
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SKSTBA6025 6BA X 1/4 SOCKET SETSCREW
29 In Stock for despatch
Price Unavailable
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SKSTBA6037 6BA X 3/8 SOCKET SETSCREW
20 In Stock for despatch
Price Unavailable
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SKSTBA6050 6BA X 1/2 SOCKET SETSCREW
100 In Stock for despatch
Price Unavailable
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SKSTBA6075 6BA X 3/4 SOCKET SETSCREW
50 In Stock for despatch
Price Unavailable
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SKSTBA8019 8BA X 3/16 SOCKET SETSCREW
Out of Stock
£41.60 (exc VAT) per HUND
£49.92 (inc VAT)
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