BA THREAD

Descriptions

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.

Specifications

No detailed specifications are available for this product.

Downloads

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Code	Description	Price	Quantity
SMSBA0150CHS	*OBA X 1.1/2 SLOT CHEESE MACHINE SCREW Out of Stock	£331.50 (exc VAT) per THOU £397.80 (inc VAT) per THOU	- +
SMSBA0200CH	*0BA X 2" SLOT CHEESE MACHINE SCREW Out of Stock	£1,522.70 (exc VAT) per THOU £1,827.24 (inc VAT) per THOU	- +
SMSBA1075CHP	*1BA X 3/4 SLOT CHEESE MACHINE SCREW ZINC Out of Stock	£291.70 (exc VAT) per THOU £350.04 (inc VAT) per THOU	- +
SMSBA1075CHS	*1BA X 3/4 SLOT CHEESE MACHINE SCREW Out of Stock	£233.30 (exc VAT) per THOU £279.96 (inc VAT) per THOU	- +
SMSBA1150CHS	*1BA X 1.1/2 SLOT CHEESE MACHINE SCREW Out of Stock	£331.50 (exc VAT) per THOU £397.80 (inc VAT) per THOU	- +
SMSBA1200CH	*1BA X 2" SLOT CHEESE MACHINE SCREW Out of Stock	£591.20 (exc VAT) per THOU £709.44 (inc VAT) per THOU	- +
SMSBA2025CH	2BA X 1/4 SLOT CHEESE MACHINE SCREW STEEL Out of Stock	£112.50 (exc VAT) per THOU £135.00 (inc VAT) per THOU	- +
SMSBA2031CH	*2BA X 5/16 SLOT CHEESE MACHINE SCREW Out of Stock	£97.30 (exc VAT) per THOU £116.76 (inc VAT) per THOU	- +
SMSBA2031CHP	*2BA X 5/16 SLOT CHEESE MACHINE SCREW ZINC Out of Stock	£96.40 (exc VAT) per THOU £115.68 (inc VAT) per THOU	- +
SMSBA2037CHP	*2BA X 3/8 SLOT CHEESE MACHINE SCREW ZINC Out of Stock	£120.70 (exc VAT) per THOU £144.84 (inc VAT) per THOU	- +
SMSBA2037CHS	*2BA X 3/8 SLOT CHEESE MACHINE SCREW Out of Stock	£47.10 (exc VAT) per THOU £56.52 (inc VAT) per THOU	- +
SMSBA2050CHP	*2BA X 1/2 SLOT CHEESE MACHINE SCREW ZINC Out of Stock	£93.00 (exc VAT) per THOU £111.60 (inc VAT) per THOU	- +
SMSBA2050CHS	*2BA X 1/2 SLOT CHEESE MACHINE SCREW Out of Stock	£54.90 (exc VAT) per THOU £65.88 (inc VAT) per THOU	- +
SMSBA2062CHP	*2BA X 5/8 SLOT CHEESE MACHINE SCREW ZINC Out of Stock	£66.10 (exc VAT) per THOU £79.32 (inc VAT) per THOU	- +
SMSBA2062CHS	*2BA X 5/8 SLOT CHEESE MACHINE SCREW Out of Stock	£52.90 (exc VAT) per THOU £63.48 (inc VAT) per THOU	- +
SMSBA2075CHP	*2BA X 3/4 SLOT CHEESE MACHINE SCREW ZINC Out of Stock	£69.90 (exc VAT) per THOU £83.88 (inc VAT) per THOU	- +
SMSBA2075CHS	*2BA X 3/4 SLOT CHEESE MACHINE SCREW 22 In Stock for dispatch	£84.90 (exc VAT) per THOU £101.88 (inc VAT) per THOU	- +
SMSBA2100CHS	*2BA X 1" SLOT CHEESE MACHINE SCREW 335 In Stock for dispatch	£159.70 (exc VAT) per THOU £191.64 (inc VAT) per THOU	- +
SMSBA2125CH	*2BA X 1.1/4 SLOT CHEESE MACHINE SCREW Out of Stock	£106.70 (exc VAT) per THOU £128.04 (inc VAT) per THOU	- +
SMSBA2150CHS	*2BA X 1.1/2 SLOT CHEESE MACHINE SCREW 138 In Stock for dispatch	£203.50 (exc VAT) per THOU £244.20 (inc VAT) per THOU	- +
SMSBA2200CH	*2BA X 2" SLOT CHEESE MACHINE SCREW 430 In Stock for dispatch	£440.90 (exc VAT) per THOU £529.08 (inc VAT) per THOU	- +
SMSBA2225CH	*2BA X 2.1/4 SLOT CHEESE MACHINE SCREW Out of Stock	£191.60 (exc VAT) per THOU £229.92 (inc VAT) per THOU	- +
SMSBA2250CHS	*2BA X 2.1/2 SLOT CHEESE MACHINE SCREW Out of Stock	£175.90 (exc VAT) per THOU £211.08 (inc VAT) per THOU	- +
SMSBA3150CH	*3BA X 1.1/2 SLOT CHEESE MACHINE SCREW Out of Stock	£591.20 (exc VAT) per THOU £709.44 (inc VAT) per THOU	- +
SMSBA4025CHP	*4BA X 1/4 SLOT CHEESE MACHINE SCREW ZINC Out of Stock	£38.40 (exc VAT) per THOU £46.08 (inc VAT) per THOU	- +
SMSBA4025CHS	*4BA X 1/4 SLOT CHEESE MACHINE SCREW Out of Stock	£30.70 (exc VAT) per THOU £36.84 (inc VAT) per THOU	- +
SMSBA4031CHS	*4BA X 5/16 SLOT CHEESE MACHINE SCREW Out of Stock	£85.60 (exc VAT) per THOU £102.72 (inc VAT) per THOU	- +
SMSBA4031CHZY	*4BA X 5/16 SLOT CHEESE MACHINE SCREW ZINC/YELLOW Out of Stock	£449.60 (exc VAT) per THOU £539.52 (inc VAT) per THOU	- +
SMSBA4037CH	*4BA X 3/8 SLOT CHEESE MACHINE SCREW Out of Stock	£44.50 (exc VAT) per THOU £53.40 (inc VAT) per THOU	- +
SMSBA4050CH	*4BA X 1/2 SLOT CHEESE MACHINE SCREW Out of Stock	£34.70 (exc VAT) per THOU £41.64 (inc VAT) per THOU	- +
SMSBA4062CHP	*4BA X 5/8 SLOT CHEESE MACHINE SCREW ZINC Out of Stock	£46.00 (exc VAT) per THOU £55.20 (inc VAT) per THOU	- +
SMSBA4062CHS	*4BA X 5/8 SLOT CHEESE MACHINE SCREW Out of Stock	£36.80 (exc VAT) per THOU £44.16 (inc VAT) per THOU	- +
SMSBA4075CH	*4BA X 3/4 SLOT CHEESE MACHINE SCREW Out of Stock	£43.90 (exc VAT) per THOU £52.68 (inc VAT) per THOU	- +
SMSBA4075CHP	*4BA X 3/4 SLOT CHEESE MACHINE SCREW ZINC 34 In Stock for dispatch	£86.70 (exc VAT) per THOU £104.04 (inc VAT) per THOU	- +
SMSBA4100CHS	*4BA X 1" SLOT CHEESE MACHINE SCREW Out of Stock	£47.10 (exc VAT) per THOU £56.52 (inc VAT) per THOU	- +
SMSBA4150CH	*4BA X 1.1/2 SLOT CHEESE MACHINE SCREW Out of Stock	£114.50 (exc VAT) per THOU £137.40 (inc VAT) per THOU	- +
SMSBA4175CHS	*4BA X 1.3/4 SLOT CHEESE MACHINE SCREW Out of Stock	£104.30 (exc VAT) per THOU £125.16 (inc VAT) per THOU	- +
SMSBA4200CH	*4BA X 2" SLOT CHEESE MACHINE SCREW Out of Stock	£200.00 (exc VAT) per THOU £240.00 (inc VAT) per THOU	- +
SMSBA4250CH	*4BA X 2.1/2 SLOT CHEESE MACHINE SCREW Out of Stock	£1,102.70 (exc VAT) per THOU £1,323.24 (inc VAT) per THOU	- +
SMSBA4300CH	*4BA X 3" SLOT CHEESE MACHINE SCREW Out of Stock	£428.70 (exc VAT) per THOU £514.44 (inc VAT) per THOU	- +
SMSBA6025CHP	*6BA X 1/4 SLOT CHEESE MACHINE SCREW ZINC Out of Stock	£107.30 (exc VAT) per THOU £128.76 (inc VAT) per THOU	- +
SMSBA6037CHP	*6BA X 3/8 SLOT CHEESE MACHINE SCREW ZINC Out of Stock	£48.80 (exc VAT) per THOU £58.56 (inc VAT) per THOU	- +
SMSBA6050CH	*6BA X 1/2 SLOT CHEESE MACHINE SCREW Out of Stock	£45.30 (exc VAT) per THOU £54.36 (inc VAT) per THOU	- +
SMSBA6050CHP	*6BA X 1/2 SLOT CHEESE MACHINE SCREW ZINC Out of Stock	£37.70 (exc VAT) per THOU £45.24 (inc VAT) per THOU	- +
SMSBA6062CH	*6BA X 5/8 SLOT CHEESE MACHINE SCREW Out of Stock	£29.70 (exc VAT) per THOU £35.64 (inc VAT) per THOU	- +
SMSBA6062CHP	*6BA X 5/8 SLOT CHEESE MACHINE SCREW ZINC 100 In Stock for dispatch	£105.00 (exc VAT) per THOU £126.00 (inc VAT) per THOU	- +
SMSBA6075CH	*6BA X 3/4 SLOT CHEESE MACHINE SCREW Out of Stock	£31.10 (exc VAT) per THOU £37.32 (inc VAT) per THOU	- +
SMSBA6100CHP	*6BA X 1" SLOT CHEESE MACHINE SCREW ZINC Out of Stock	£13.30 (exc VAT) per THOU £15.96 (inc VAT) per THOU	- +
SMSBA6100CHS	*6BA X 1" SLOT CHEESE MACHINE SCREW Out of Stock	£43.60 (exc VAT) per THOU £52.32 (inc VAT) per THOU	- +

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