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
BMSBA0050RS	*OBA X 1/2 BRASS RND SLOTTED MACHINE SCREW 80 In Stock for dispatch	Price Unavailable	- +
BMSBA0075RS	*0BA X 3/4 BRASS RND SLOTTED MACHINE SCREW 450 In Stock for dispatch	Price Unavailable	- +
BMSBA0100RS	*0BA X 1" BRASS RND SLOTTED MACHINE SCREW 388 In Stock for dispatch	Price Unavailable	- +
BMSBA0125RS	*0BA X 1.1/4 BRASS RND SLOTTED MACHINE SCREW Out of Stock	£1,710.00 (exc VAT) per THOU £2,052.00 (inc VAT) per THOU	- +
BMSBA0150RS	*OBA X 1.1/2 BRASS RND SLOTTED MACHINE SCREW 184 In Stock for dispatch	Price Unavailable	- +
BMSBA0200RS	*0BA X 2" BRASS RND SLOTTED MACHINE SCREW 80 In Stock for dispatch	Price Unavailable	- +
BMSBA1050RS	*1BA X 1/2 BRASS RND SLOTTED MACHINE SCREW 490 In Stock for dispatch	Price Unavailable	- +
BMSBA1075RS	*1BA X 3/4 BRASS RND SLOTTED MACHINE SCREW Out of Stock	£2,095.60 (exc VAT) per THOU £2,514.72 (inc VAT) per THOU	- +
BMSBA1100RS	*1BA X 1" BRASS RND SLOTTED MACHINE SCREW Out of Stock	£1,295.00 (exc VAT) per THOU £1,554.00 (inc VAT) per THOU	- +
BMSBA1150RS	*1BA X 1.1/2 BRASS RND SLOTTED MACHINE SCREW Out of Stock	£2,863.90 (exc VAT) per THOU £3,436.68 (inc VAT) per THOU	- +
BMSBA1200RS	*1BA X 2" BRASS RND SLOTTED MACHINE SCREW 25 In Stock for dispatch	Price Unavailable	- +
BMSBA2025RS	2BA X 1/4 BRASS RND SLOTTED MACHINE SCREW 500 In Stock for dispatch	Price Unavailable	- +
BMSBA2037RS	*2BA X 3/8 BRASS RND SLOTTED MACHINE SCREW 616 In Stock for dispatch	£255.10 (exc VAT) per THOU £306.12 (inc VAT) per THOU	- +
BMSBA2050RS	*2BA X 1/2 BRASS RND SLOTTED MACHINE SCREW 300 In Stock for dispatch	Price Unavailable	- +
BMSBA2062RS	*2BA X 5/8 BRASS RND SLOTTED MACHINE SCREW Out of Stock	£514.10 (exc VAT) per THOU £616.92 (inc VAT) per THOU	- +
BMSBA2075R	*2BA X 3/4 BRASS ROUND SLOTTED MACHINE SCREW 196 In Stock for dispatch	£395.40 (exc VAT) per THOU £474.48 (inc VAT) per THOU	- +
BMSBA2100R	*2BA X 1" BRASS ROUND SLOTTED MACHINE SCREW 12 In Stock for dispatch	Price Unavailable	- +
BMSBA2125RS	*2BA X 1.1/4 BRASS ROUND SLOTTED MACHINE SCREW 266 In Stock for dispatch	Price Unavailable	- +
BMSBA2150RS	*2BA X 1.1/2 BRASS ROUND SLOTTED MACHINE SCREW Out of Stock	£272.70 (exc VAT) per THOU £327.24 (inc VAT) per THOU	- +
BMSBA2200R	*2BA X 2" BRASS ROUND SLOTTED MACHINE SCREW 11 In Stock for dispatch	Price Unavailable	- +
BMSBA2250RS	*2BA X 2.1/2 BRASS ROUND SLOTTED MACHINE SCREW 46 In Stock for dispatch	Price Unavailable	- +
BMSBA2300RS	*2BA X 3" BRASS ROUND SLOTTED MACHINE SCREW Out of Stock	£1,375.70 (exc VAT) per THOU £1,650.84 (inc VAT) per THOU	- +
BMSBA3050RS	*3BA X 1/2 BRASS ROUND SLOTTED MACHINE SCREW Out of Stock	£756.00 (exc VAT) per THOU £907.20 (inc VAT) per THOU	- +
BMSBA3075RS	*3BA X 3/4 BRASS ROUND SLOTTED MACHINE SCREW 4 In Stock for dispatch	£539.55 (exc VAT) per THOU £647.46 (inc VAT) per THOU	- +
BMSBA3100RS	*3BA X 1" BRASS ROUND SLOTTED MACHINE SCREW 150 In Stock for dispatch	Price Unavailable	- +
BMSBA3150RS	*3BA X 1.1/2 BRASS ROUND SLOTTED MACHINE SCREW 200 In Stock for dispatch	Price Unavailable	- +
BMSBA3200RS	*3BA X 2" BRASS ROUND SLOTTED MACHINE SCREW 150 In Stock for dispatch	Price Unavailable	- +
BMSBA3300RS	*3BA X 3" BRASS ROUND SLOTTED MACHINE SCREW Out of Stock	£2,812.10 (exc VAT) per THOU £3,374.52 (inc VAT) per THOU	- +
BMSBA4025RS	*4BA X 1/4 BRASS ROUND SLOTTED MACHINE SCREW 100 In Stock for dispatch	£166.80 (exc VAT) per THOU £200.16 (inc VAT) per THOU	- +
BMSBA4037R	*4BA X 3/8 BRASS ROUND SLOTTED MACHINE SCREW 190 In Stock for dispatch	Price Unavailable	- +
BMSBA4050RS	*4BA X 1/2 BRASS ROUND SLOTTED MACHINE SCREW 95 In Stock for dispatch	Price Unavailable	- +
BMSBA4075RS	*4BA X 3/4 BRASS ROUND SLOTTED MACHINE SCREW 1000 In Stock for dispatch	Price Unavailable	- +
BMSBA4100RS	*4BA X 1" BRASS ROUND SLOTTED MACHINE SCREW 900 In Stock for dispatch	Price Unavailable	- +
BMSBA4125RS	*4BA X 1.1/4 BRASS ROUND SLOTTED MACHINE SCREW 50 In Stock for dispatch	£433.33 (exc VAT) per THOU £520.00 (inc VAT) per THOU	- +
BMSBA4150RS	*4BA X 1.1/2 BRASS ROUND SLOTTED MACHINE SCREW Out of Stock	£145.10 (exc VAT) per THOU £174.12 (inc VAT) per THOU	- +
BMSBA4200R	*4BA X 2" BRASS ROUND SLOTTED MACHINE SCREW 2750 In Stock for dispatch	Price Unavailable	- +
BMSBA4250RS	*4BA X 2.1/2 BRASS ROUND SLOTTED MACHINE SCREW Out of Stock	£1,889.40 (exc VAT) per THOU £2,267.28 (inc VAT) per THOU	- +
BMSBA4300RS	*4BA X 3" BRASS ROUND SLOTTED MACHINE SCREW Out of Stock	Price Unavailable	- +
BMSBA5050RS	*5BA X 1/2 BRASS ROUND SLOTTED MACHINE SCREW Out of Stock	£595.70 (exc VAT) per THOU £714.84 (inc VAT) per THOU	- +
BMSBA5075RS	*5BA X 3/4 BRASS ROUND SLOTTED MACHINE SCREW 220 In Stock for dispatch	Price Unavailable	- +
BMSBA5100RS	*5BA X 1" BRASS ROUND SLOTTED MACHINE SCREW Out of Stock	£674.90 (exc VAT) per THOU £809.88 (inc VAT) per THOU	- +
BMSBA5150RS	*5BA X 1.1/2 BRASS ROUND SLOTTED MACHINE SCREW 50 In Stock for dispatch	Price Unavailable	- +
BMSBA5200RS	*5BA X 2" BRASS ROUND SLOTTED MACHINE SCREW Out of Stock	£1,406.10 (exc VAT) per THOU £1,687.32 (inc VAT) per THOU	- +
BMSBA6025RS	*6BA X 1/4 BRASS ROUND SLOTTED MACHINE SCREW 2900 In Stock for dispatch	Price Unavailable	- +
BMSBA6037RS	6BA X 3/8 BRASS ROUND SLOTTED MACHINE SCREW 400 In Stock for dispatch	Price Unavailable	- +
BMSBA6050RS	*6BA X 1/2 BRASS ROUND SLOTTED MACHINE SCREW 1000 In Stock for dispatch	£139.50 (exc VAT) per THOU £167.40 (inc VAT) per THOU	- +
BMSBA6075RS	*6BA X 3/4 BRASS ROUND SLOTTED MACHINE SCREW 40 In Stock for dispatch	£188.40 (exc VAT) per THOU £226.08 (inc VAT) per THOU	- +
BMSBA6100RS	*6BA X 1" BRASS ROUND SLOTTED MACHINE SCREW 350 In Stock for dispatch	Price Unavailable	- +
BMSBA6125RS	*6BA X 1.1/4 BRASS ROUND SLOTTED MACHINE SCREW Out of Stock	£832.30 (exc VAT) per THOU £998.76 (inc VAT) per THOU	- +
BMSBA6150RS	*6BA X 1.1/2 BRASS ROUND SLOTTED MACHINE SCREW 30 In Stock for dispatch	Price Unavailable	- +
BMSBA6200RS	*6BA X 2" BRASS ROUND SLOTTED MACHINE SCREW 150 In Stock for dispatch	Price Unavailable	- +

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