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
SCSBA2025 2BA X 1/4 SOCKET CSK SCREW
Out of Stock
Price Unavailable
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SCSBA2037 2BA X 3/8 SOCKET CSK SCREW
11 In Stock for despatch
£75.65 (exc VAT) per HUND
£90.78 (inc VAT)
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SCSBA2050 2BA X 1/2 SOCKET CSK SCREW
14 In Stock for despatch
Price Unavailable
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SCSBA2050P 2BA X 1/2 SOCKET CSK SCREW ZINC PLATED
Out of Stock
£71.90 (exc VAT) per HUND
£86.28 (inc VAT)
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SCSBA2062 2BA X 5/8 SOCKET CSK SCREW
480 In Stock for despatch
Price Unavailable
-
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SCSBA2075 2BA X 3/4 SOCKET CSK SCREW
10 In Stock for despatch
Price Unavailable
-
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SCSBA2087 2BA X 7/8 SOCKET CSK SCREW
150 In Stock for despatch
Price Unavailable
-
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SCSBA2100 2BA X 1" SOCKET CSK SCREW
111 In Stock for despatch
Price Unavailable
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SCSBA2150 2BA X 1.1/2 SOCKET CSK SCREW
14 In Stock for despatch
£320.00 (exc VAT) per HUND
£384.00 (inc VAT)
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SCSBA4025 4BA X 1/4 SOCKET CSK SCREW
Out of Stock
£71.00 (exc VAT) per HUND
£85.20 (inc VAT)
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SCSBA4031 4BA X 5/16 SOCKET CSK SCREW
Out of Stock
£93.20 (exc VAT) per HUND
£111.84 (inc VAT)
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SCSBA4037 4BA X 3/8 SOCKET CSK SCREW
42 In Stock for despatch
Price Unavailable
-
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SCSBA4050 4BA X 1/2 SOCKET CSK SCREW
100 In Stock for despatch
Price Unavailable
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SCSBA4062 4BA X 5/8 SOCKET CSK SCREW
100 In Stock for despatch
Price Unavailable
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SCSBA4075 4BA X 3/4 SOCKET CSK SCREW
100 In Stock for despatch
Price Unavailable
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SCSBA4100 4BA X 1" SOCKET CSK SCREW
380 In Stock for despatch
Price Unavailable
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SCSBA6025 6BA X 1/4 SOCKET CSK SCREW
Out of Stock
£71.30 (exc VAT) per HUND
£85.56 (inc VAT)
-
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SCSBA6050 6BA X 1/2 SOCKET CSK SCREW
92 In Stock for despatch
£84.80 (exc VAT) per HUND
£101.76 (inc VAT)
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SCSBA6075 6BA X 3/4 SOCKET CSK SCREW
Out of Stock
£159.40 (exc VAT) per HUND
£191.28 (inc VAT)
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SCSBA6100 6BA X 1" SOCKET CSK SCREW
20 In Stock for despatch
Price Unavailable
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