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
SMSBA0075CS	*0BA X 3/4 SLOT CSK MACHINE SCREW Out of Stock	£233.30 (exc VAT) per THOU £279.96 (inc VAT) per THOU	- +
SMSBA0100CS	*0BA X 1" SLOT CSK MACHINE SCREW Out of Stock	£13.30 (exc VAT) per THOU £15.96 (inc VAT) per THOU	- +
SMSBA0150CSP	*0BA X 1.1/2 SLOT CSK MACHINE SCREW ZINC Out of Stock	£331.50 (exc VAT) per THOU £397.80 (inc VAT) per THOU	- +
SMSBA0200CS	*0BA X 2" SLOT CSK MACHINE SCREW Out of Stock	£986.10 (exc VAT) per THOU £1,183.32 (inc VAT) per THOU	- +
SMSBA0200CSP	*OBA X 2" SLOT CSK MACHINE SCREW ZINC Out of Stock	£92.40 (exc VAT) per THOU £110.88 (inc VAT) per THOU	- +
SMSBA0200CSZYP	*0BA X 2" SLOT CSK MACHINE SCREW ZINC/YELLOW Out of Stock	£986.10 (exc VAT) per THOU £1,183.32 (inc VAT) per THOU	- +
SMSBA2025CS	2BA X 1/4 SLOT CSK MACHINE SCREW 876 In Stock for dispatch	£99.50 (exc VAT) per THOU £119.40 (inc VAT) per THOU	- +
SMSBA2037CS	*2BA X 3/8 SLOT CSK MACHINE SCREW Out of Stock	£147.50 (exc VAT) per THOU £177.00 (inc VAT) per THOU	- +
SMSBA2050CS	*2BA X 1/2 SLOT CSK MACHINE SCREW 260 In Stock for dispatch	£67.00 (exc VAT) per THOU £80.40 (inc VAT) per THOU	- +
SMSBA2050CSP	*2BA X 1/2 SLOT CSK MACHINE SCREW ZINC Out of Stock	£54.00 (exc VAT) per THOU £64.80 (inc VAT) per THOU	- +
SMSBA2062CS	*2BA X 5/8 SLOT CSK MACHINE SCREW Out of Stock	£50.00 (exc VAT) per THOU £60.00 (inc VAT) per THOU	- +
SMSBA2075CS	*2BA X 3/4 SLOT CSK MACHINE SCREW Out of Stock	£63.60 (exc VAT) per THOU £76.32 (inc VAT) per THOU	- +
SMSBA2100CS	*2BA X 1" SLOT CSK MACHINE SCREW 457 In Stock for dispatch	£60.00 (exc VAT) per THOU £72.00 (inc VAT) per THOU	- +
SMSBA2125CS	2BA X 1.1/4" SLTD CSK MACHINE SCREWS 76 In Stock for dispatch	£500.00 (exc VAT) per THOU £600.00 (inc VAT) per THOU	- +
SMSBA2150CS	*2BA X 1.1/2 SLOT CSK MACHINE SCREW Out of Stock	£170.00 (exc VAT) per THOU £204.00 (inc VAT) per THOU	- +
SMSBA2150CSP	2BA X 1.1/2 SLOT CSK MACHINE SCREW ZINC 960 In Stock for dispatch	Price Unavailable	- +
SMSBA2200CS	*2BA X 2" SLOT CSK MACHINE SCREW 363 In Stock for dispatch	£254.70 (exc VAT) per THOU £305.64 (inc VAT) per THOU	- +
SMSBA2300CS	*2BA X 3" SLOT CSK MACHINE SCREW Out of Stock	£1,441.60 (exc VAT) per THOU £1,729.92 (inc VAT) per THOU	- +
SMSBA3100CS	*3BA X 1" SLOT CSK MACHINE SCREW Out of Stock	£523.90 (exc VAT) per THOU £628.68 (inc VAT) per THOU	- +
SMSBA4025CS	*4BA X 1/4 SLOT CSK MACHINE SCREW Out of Stock	£27.70 (exc VAT) per THOU £33.24 (inc VAT) per THOU	- +
SMSBA4037CS	4BA X 3/8 SLOT CSK MACHINE SCREW 500 In Stock for dispatch	£70.90 (exc VAT) per THOU £85.08 (inc VAT) per THOU	- +
SMSBA4050CS	*4BA X 1/2 SLOT CSK MACHINE SCREW 274 In Stock for dispatch	£100.00 (exc VAT) per THOU £120.00 (inc VAT) per THOU	- +
SMSBA4075CS	*4BA X 3/4 SLOT CSK MACHINE SCREW 688 In Stock for dispatch	£228.50 (exc VAT) per THOU £274.20 (inc VAT) per THOU	- +
SMSBA4100CS	*4BA X 1" SLOT CSK MACHINE SCREW Out of Stock	£60.90 (exc VAT) per THOU £73.08 (inc VAT) per THOU	- +
SMSBA4150CS	*4BA X 1.1/2 SLOT CSK MACHINE SCREW Out of Stock	£86.00 (exc VAT) per THOU £103.20 (inc VAT) per THOU	- +
SMSBA4200CS	*4BA X 2" SLOT CSK MACHINE SCREW Out of Stock	£173.30 (exc VAT) per THOU £207.96 (inc VAT) per THOU	- +
SMSBA4250CS	*4BA X 2.1/2 SLOT CSK MACHINE SCREW Out of Stock	£359.20 (exc VAT) per THOU £431.04 (inc VAT) per THOU	- +
SMSBA4300CS	*4BA X 3" SLOT CSK MACHINE SCREW Out of Stock	£428.70 (exc VAT) per THOU £514.44 (inc VAT) per THOU	- +
SMSBA5062CS	*5BA X 5/8" CSK SLOTTED MACHINE SCREW 952 In Stock for dispatch	£270.00 (exc VAT) per THOU £324.00 (inc VAT) per THOU	- +
SMSBA6025CS	*6BA X 1/4 SLOT CSK MACHINE SCREW Out of Stock	£47.70 (exc VAT) per THOU £57.24 (inc VAT) per THOU	- +
SMSBA6037CS	*6BA X 3/8 SLOT CSK MACHINE SCREW Out of Stock	£24.30 (exc VAT) per THOU £29.16 (inc VAT) per THOU	- +
SMSBA6050CS	*6BA X 1/2 SLOT CSK MACHINE SCREW Out of Stock	£35.60 (exc VAT) per THOU £42.72 (inc VAT) per THOU	- +
SMSBA6062CS	6BA X 5/8 SLOT CSK MACHINE SCREW Out of Stock	£60.10 (exc VAT) per THOU £72.12 (inc VAT) per THOU	- +
SMSBA6075CS	*6BA X 3/4 SLOT CSK MACHINE SCREW 35 In Stock for dispatch	£348.53 (exc VAT) per THOU £418.24 (inc VAT) per THOU	- +
SMSBA8019CS	*8BA X 3/16 SLOT CSK MACHINE SCREW Out of Stock	£60.90 (exc VAT) per THOU £73.08 (inc VAT) per THOU	- +
SMSBA8025CS	*8BA X 1/4 SLOT CSK MACHINE SCREW Out of Stock	£266.70 (exc VAT) per THOU £320.04 (inc VAT) per THOU	- +

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