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

There are no downloads for this product.

Code	Description	Price	Quantity
BMSBA0050CHS	*0BA X 1/2 BRASS CHEESE SLOTTED MACHINE SCREW 43 In Stock for dispatch	£1,537.57 (exc VAT) per THOU £1,845.08 (inc VAT) per THOU	- +
BMSBA0075CH	OBA X 3/4 BRASS CHEESE SLOTTED MACHINE SCREW 17 In Stock for dispatch	Price Unavailable	- +
BMSBA0100CHS	*OBA X 1" BRASS CHEESE SLOTTED MACHINE SCREW 204 In Stock for dispatch	£1,100.00 (exc VAT) per THOU £1,320.00 (inc VAT) per THOU	- +
BMSBA0150CH	*0BA X 1.1/2 BRASS CHEESE SLOTTED MACHINE SCREW 23 In Stock for dispatch	£1,178.86 (exc VAT) per THOU £1,414.63 (inc VAT) per THOU	- +
BMSBA0300CH	0BA X 3" BRASS CHEESE SLOTTED MACHINE SCREW 300 In Stock for dispatch	Price Unavailable	- +
BMSBA09100CH	9BA X 1" BRASS CHEESE SLOTTED MACHINE SCREW 90 In Stock for dispatch	£1,650.00 (exc VAT) per THOU £1,980.00 (inc VAT) per THOU	- +
BMSBA10050CH	10BA X 1/2 BRASS CHEESE SLOTTED MACHINE SCREW 50 In Stock for dispatch	£1,750.00 (exc VAT) per THOU £2,100.00 (inc VAT) per THOU	- +
BMSBA10075CH	10BA X 3/4 BRASS CHEESE SLOTTED MACHINE SCREW 10 In Stock for dispatch	£1,400.00 (exc VAT) per THOU £1,680.00 (inc VAT) per THOU	- +
BMSBA10100CH	10BA X 1" BRASS CHEESE SLOTTED MACHINE SCREW 50 In Stock for dispatch	£1,870.00 (exc VAT) per THOU £2,244.00 (inc VAT) per THOU	- +
BMSBA1050CH	1BA X 1/2 BRASS CHEESE SLOTTED MACHINE SCREW 360 In Stock for dispatch	Price Unavailable	- +
BMSBA1062CH	1BA X 5/8 BRASS CHEESE SLOTTED MACHINE SCREW 498 In Stock for dispatch	Price Unavailable	- +
BMSBA1075CH	1BA X 3/4 BRASS CHEESE SLOTTED MACHINE SCREW 260 In Stock for dispatch	Price Unavailable	- +
BMSBA1100CH	*1BA X 1" BRASS CHEESE SLOTTED MACHINE SCREW 54 In Stock for dispatch	£2,346.15 (exc VAT) per THOU £2,815.38 (inc VAT) per THOU	- +
BMSBA1150CH	*1BA X 1.1/2 BRASS CHEESE SLOTTED MACHINE SCREW 29 In Stock for dispatch	£7,850.00 (exc VAT) per THOU £9,420.00 (inc VAT) per THOU	- +
BMSBA1200CH	*1BA X 2" BRASS CHEESE SLOTTED MACHINE SCREW 8 In Stock for dispatch	£1,905.41 (exc VAT) per THOU £2,286.49 (inc VAT) per THOU	- +
BMSBA1300CH	1BA X 3" BRASS CHEESE SLOTTED MACHINE SCREW Out of Stock	Price Unavailable	- +
BMSBA2025CH	2BA X 1/4 BRASS CHEESE SLOTTED MACHINE SCREW 2000 In Stock for dispatch	Price Unavailable	- +
BMSBA2031CH	2BA X 5/16 BRASS CHEESE SLOTTED MACHINE SCREW 900 In Stock for dispatch	£398.80 (exc VAT) per THOU £478.56 (inc VAT) per THOU	- +
BMSBA2037CH	*2BA X 3/8 BRASS CHEESE SLOTTED MACHINE SCREW Out of Stock	£542.10 (exc VAT) per THOU £650.52 (inc VAT) per THOU	- +
BMSBA2062CH	2BA X 5/8 BRASS CHEESE SLOTTED MACHINE SCREW 2250 In Stock for dispatch	Price Unavailable	- +
BMSBA2075CH	*2BA X 3/4 BRASS CHEESE SLOTTED MACHINE SCREW 60 In Stock for dispatch	£427.40 (exc VAT) per THOU £512.88 (inc VAT) per THOU	- +
BMSBA2087CH	2BA X 7/8 BRASS CHEESE SLOTTED MACHINE SCREW 1450 In Stock for dispatch	£81.00 (exc VAT) per THOU £97.20 (inc VAT) per THOU	- +
BMSBA2100CH	*2BA X 1" BRASS CHEESE SLOTTED MACHINE SCREW 243 In Stock for dispatch	£710.00 (exc VAT) per THOU £852.00 (inc VAT) per THOU	- +
BMSBA2125CH	*2BA X 1.1/4 BRASS CHEESE SLOTTED MACHINE SCREW 200 In Stock for dispatch	Price Unavailable	- +
BMSBA2150CHS	*2BA X 1.1/2 BRASS CHEESE SLOTTED MACHINE SCREW 30 In Stock for dispatch	£775.63 (exc VAT) per THOU £930.76 (inc VAT) per THOU	- +
BMSBA2200CHS	*2BA X 2" BRASS CHEESE SLOTTED MACHINE SCREW 75 In Stock for dispatch	£1,500.00 (exc VAT) per THOU £1,800.00 (inc VAT) per THOU	- +
BMSBA2300CH	2BA X 3" BRASS CHEESE SLOTTED MACHINE SCREW 70 In Stock for dispatch	Price Unavailable	- +
BMSBA3037CH	3BA X 3/8 BRASS CHEESE SLOTTED MACHINE SCREW 93 In Stock for dispatch	Price Unavailable	- +
BMSBA3050CH	3BA X 1/2 BRASS CHEESE SLOTTED MACHINE SCREW 99 In Stock for dispatch	£1,059.06 (exc VAT) per THOU £1,270.87 (inc VAT) per THOU	- +
BMSBA3062CH	3BA X 5/8 BRASS CHEESE SLOTTED MACHINE SCREW 50 In Stock for dispatch	Price Unavailable	- +
BMSBA3075CH	*3BA X 3/4 BRASS CHEESE SLOTTED MACHINE SCREW Out of Stock	£2,300.00 (exc VAT) per THOU £2,760.00 (inc VAT) per THOU	- +
BMSBA3100CH	3BA X 1" BRASS CHEESE SLOTTED MACHINE SCREW 67 In Stock for dispatch	£299.40 (exc VAT) per THOU £359.28 (inc VAT) per THOU	- +
BMSBA3125CH	3BA X 1.1/4 BRASS CHEESE SLOTTED MACHINE SCREW 320 In Stock for dispatch	Price Unavailable	- +
BMSBA3150CH	*3BA X 1.1/2 BRASS CHEESE SLOTTED MACHINE SCREW 140 In Stock for dispatch	£1,594.10 (exc VAT) per THOU £1,912.92 (inc VAT) per THOU	- +
BMSBA3200CHS	*3BA X 2" BRASS CHEESE SLOTTED MACHINE SCREW Out of Stock	£1,150.00 (exc VAT) per THOU £1,380.00 (inc VAT) per THOU	- +
BMSBA4025CH	*4BA X 1/4 BRASS CHEESE SLOTTED MACHINE SCREW Out of Stock	£177.70 (exc VAT) per THOU £213.24 (inc VAT) per THOU	- +
BMSBA4031CHS	*4BA X 5/16 BRASS CHEESE SLOTTED MACHINE SCREW Out of Stock	£186.00 (exc VAT) per THOU £223.20 (inc VAT) per THOU	- +
BMSBA4037CHS	*4BA X 3/8 BRASS CHEESE SLOTTED MACHINE SCREW 52 In Stock for dispatch	£274.33 (exc VAT) per THOU £329.20 (inc VAT) per THOU	- +
BMSBA4050CH	*4BA X 1/2 BRASS CHEESE SLOTTED MACHINE SCREW 610 In Stock for dispatch	£75.75 (exc VAT) per THOU £90.90 (inc VAT) per THOU	- +
BMSBA4062CH	*4BA X 5/8 BRASS CHEESE SLOTTED MACHINE SCREW 2060 In Stock for dispatch	Price Unavailable	- +
BMSBA4075CH	*4BA X 3/4 BRASS CHEESE SLOTTED MACHINE SCREW 370 In Stock for dispatch	£127.60 (exc VAT) per THOU £153.12 (inc VAT) per THOU	- +
BMSBA4087CH	*4BA X 7/8 BRASS CHEESE SLOTTED MACHINE SCREW Out of Stock	£500.00 (exc VAT) per THOU £600.00 (inc VAT) per THOU	- +
BMSBA4100CHS	*4BA X 1" BRASS CHEESE SLOTTED MACHINE SCREW Out of Stock	£425.46 (exc VAT) per THOU £510.55 (inc VAT) per THOU	- +
BMSBA4150CH	*4BA X 1.1/2 BRASS CHEESE SLOTTED MACHINE SCREW 250 In Stock for dispatch	£214.28 (exc VAT) per THOU £257.14 (inc VAT) per THOU	- +
BMSBA4200CHS	*4BA X 2" BRASS CHEESE SLOTTED MACHINE SCREW 5 In Stock for dispatch	£892.85 (exc VAT) per THOU £1,071.42 (inc VAT) per THOU	- +
BMSBA4250CH	*4BA X 2.1/2 BRASS CHEESE SLOTTED MACHINE SCREW 1139 In Stock for dispatch	Price Unavailable	- +
BMSBA4300CH	4BA X 3" BRASS CHEESE SLOTTED MACHINE SCREW 3000 In Stock for dispatch	Price Unavailable	- +
BMSBA5050CH	*5BA X 1/2 BRASS CHEESE SLOTTED MACHINE SCREW 1930 In Stock for dispatch	Price Unavailable	- +
BMSBA5100CH	*5BA X 1" BRASS CHEESE SLOTTED MACHINE SCREW 175 In Stock for dispatch	£361.20 (exc VAT) per THOU £433.44 (inc VAT) per THOU	- +
BMSBA5150CH	5BA X 1.1/2 BRASS CHEESE SLOTTED MACHINE SCREW Out of Stock	£500.00 (exc VAT) per THOU £600.00 (inc VAT) per THOU	- +
BMSBA5200CHS	*5BA X 2" BRASS CHEESE SLOTTED MACHINE SCREW 390 In Stock for dispatch	£722.40 (exc VAT) per THOU £866.88 (inc VAT) per THOU	- +
BMSBA6012CH	*6BA X 1/8 BRASS CHEESE SLOTTED MACHINE SCREW Out of Stock	£499.30 (exc VAT) per THOU £599.16 (inc VAT) per THOU	- +
BMSBA6025CHS	*6BA X 1/4 BRASS CHEESE SLOTTED MACHINE SCREW 1380 In Stock for dispatch	Price Unavailable	- +
BMSBA6031CH	*6BA X 5/16 BRASS CHEESE SLOTTED MACHINE SCREW Out of Stock	£199.50 (exc VAT) per THOU £239.40 (inc VAT) per THOU	- +
BMSBA6037CH	6BA X 3/8 BRASS CHEESE SLOTTED MACHINE SCREW 5200 In Stock for dispatch	Price Unavailable	- +
BMSBA6050CH	*6BA X 1/2 BRASS CHEESE SLOTTED MACHINE SCREW Out of Stock	£350.00 (exc VAT) per THOU £420.00 (inc VAT) per THOU	- +
BMSBA6062CH	6BA X 5/8 BRASS CHEESE SLOTTED MACHINE SCREW 880 In Stock for dispatch	Price Unavailable	- +
BMSBA6075CH	*6BA X 3/4 BRASS CHEESE SLOTTED MACHINE SCREW 530 In Stock for dispatch	Price Unavailable	- +
BMSBA6100CH	*6BA X 1" BRASS CHEESE SLOTTED MACHINE SCREW 600 In Stock for dispatch	£584.00 (exc VAT) per THOU £700.80 (inc VAT) per THOU	- +
BMSBA6125CH	*6BA X 1.1/4 BRASS CHEESE SLOTTED MACHINE SCREW Out of Stock	£832.30 (exc VAT) per THOU £998.76 (inc VAT) per THOU	- +
BMSBA6150CH	*6BA X 1.1/2 BRASS CHEESE SLOTTED MACHINE SCREW 130 In Stock for dispatch	£664.20 (exc VAT) per THOU £797.04 (inc VAT) per THOU	- +
BMSBA6200CHS	*6BA X 2" BRASS CHEESE SLOTTED MACHINE SCREW 6 In Stock for dispatch	£758.36 (exc VAT) per THOU £910.03 (inc VAT) per THOU	- +
BMSBA7100CH	7BA X 1" BRASS CHEESE SLOTTED MACHINE SCREW Out of Stock	Price Unavailable	- +
BMSBA8050CH	*8BA X 1/2 BRASS CHEESE SLOTTED MACHINE SCREW 950 In Stock for dispatch	£381.48 (exc VAT) per THOU £457.78 (inc VAT) per THOU	- +
BMSBA8150CH	8BA X 1.1/2 BRASS CHEESE SLOTTED MACHINE SCREW 200 In Stock for dispatch	£1,440.00 (exc VAT) per THOU £1,728.00 (inc VAT) per THOU	- +

Browse By