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. 

No detailed specifications are available for this product.

There are no downloads for this product.

Code Description Price Quantity
SSSCBA2025 2BA X 1/4 ST/ST SOCKET CAPSCREW A2/70
Out of Stock
£190.70 (exc VAT) per HUND
£228.84 (inc VAT) per HUND
-
+
SSSCBA2050 2BA X 1/2 ST/ST SOCKET CAPSCREW A2/70
50 In Stock for dispatch
£168.80 (exc VAT) per HUND
£202.56 (inc VAT) per HUND
-
+
SSSCBA2075 2BA X 3/4 ST/ST SOCKET CAPSCREW A2/70
Out of Stock
£65.21 (exc VAT) per HUND
£78.25 (inc VAT) per HUND
-
+