BSF THREAD

Descriptions

Whitworth threads were the world's first national screw thread standard, devised by Sir Joseph Whitworth in 1841. They are an imperial (inch-based) system characterized by a distinct 55° thread angle and rounded roots and crests.

Key Characteristics

Thread Angle: All Whitworth threads, including BSW and BSF, have a symmetrical V-profile with a 55° included angle between the thread flanks. This is a key difference from the 60° angle used in modern metric and Unified threads.
Thread Profile: The threads feature unique rounded roots and crests, designed to distribute stress effectively and provide excellent fatigue resistance.
Designation: Dimensions are specified in imperial units, using inches and "Threads Per Inch" (TPI) rather than metric pitch measurements.
Standardization: The standard is codified in British Standard BS 84.

BSW vs. BSF Threads

The Whitworth system encompasses two main series for general engineering:

BSW (British Standard Whitworth): This is the original, coarse-pitch thread series, primarily designed for general engineering applications like holding cast iron components or locomotives together. Its coarse pitch provides superior strength in softer materials and resistance to stripping.
BSF (British Standard Fine): This series was developed later as a fine-pitch alternative to BSW. BSF threads have the same 55° profile as BSW but a finer pitch, which provides increased core strength and better resistance to loosening from vibration, making it common in automotive and aviation applications before metric standardisation.

Specifications

No detailed specifications are available for this product.

Downloads

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Code	Description	Price	Quantity
SCSF019050	3/16 BSF X 1/2 SOCKET CAPSCREW Out of Stock	Price Unavailable	- +
SCSF019062	3/16 BSF X 5/8 SOCKET CAPSCREW 5 In Stock for dispatch	Price Unavailable	- +
SCSF019075	3/16 BSF X 3/4 SOCKET CAPSCREW 46 In Stock for dispatch	Price Unavailable	- +
SCSF019075P	3/16 BSF X 3/4 SOCKET CAPSCREW ZINC PLATED Out of Stock	Price Unavailable	- +
SCSF019100	3/16 BSF X 1" SOCKET CAPSCREW 537 In Stock for dispatch	£13.40 (exc VAT) per HUND £16.08 (inc VAT) per HUND	- +
SCSF019125	3/16 BSF X 1.1/4 SOCKET CAPSCREW Out of Stock	£143.00 (exc VAT) per HUND £171.60 (inc VAT) per HUND	- +
SCSF019125P	3/16 BSF X 1.1/4 SOCKET CAPSCREW ZINC PLATED Out of Stock	Price Unavailable	- +
SCSF019137	3/16 BSF X 1.3/8 SOCKET CAPSCREW Out of Stock	£140.50 (exc VAT) per HUND £168.60 (inc VAT) per HUND	- +
SCSF019150	3/16 BSF X 1.1/2 SOCKET CAPSCREW Out of Stock	£102.70 (exc VAT) per HUND £123.24 (inc VAT) per HUND	- +
SCSF019200	3/16 BSF X 2" SOCKET CAPSCREW Out of Stock	£155.90 (exc VAT) per HUND £187.08 (inc VAT) per HUND	- +
SCSF025025	1/4 BSF X 1/4 SOCKET CAPSCREW 20 In Stock for dispatch	Price Unavailable	- +
SCSF025037	1/4 BSF X 3/8 SOCKET CAPSCREW 10 In Stock for dispatch	£87.07 (exc VAT) per HUND £104.48 (inc VAT) per HUND	- +
SCSF025050	1/4 BSF X 1/2 SOCKET CAPSCREW 83 In Stock for dispatch	£55.22 (exc VAT) per HUND £66.26 (inc VAT) per HUND	- +
SCSF025062	1/4 BSF X 5/8 SOCKET CAPSCREW 57 In Stock for dispatch	£57.20 (exc VAT) per HUND £68.64 (inc VAT) per HUND	- +
SCSF025075	1/4 BSF X 3/4 SOCKET CAPSCREW 52 In Stock for dispatch	£71.90 (exc VAT) per HUND £86.28 (inc VAT) per HUND	- +
SCSF025100	1/4 BSF X 1" SOCKET CAPSCREW 131 In Stock for dispatch	£69.20 (exc VAT) per HUND £83.04 (inc VAT) per HUND	- +
SCSF025125	1/4 BSF X 1.1/4 SOCKET CAPSCREW Out of Stock	£83.02 (exc VAT) per HUND £99.62 (inc VAT) per HUND	- +
SCSF025150	1/4 BSF X 1.1/2 SOCKET CAPSCREW 6 In Stock for dispatch	£66.60 (exc VAT) per HUND £79.92 (inc VAT) per HUND	- +
SCSF025175	1/4 BSF X 1.3/4 SOCKET CAPSCREW 196 In Stock for dispatch	£113.50 (exc VAT) per HUND £136.20 (inc VAT) per HUND	- +
SCSF025200	1/4 BSF X 2" SOCKET CAPSCREW 28 In Stock for dispatch	Price Unavailable	- +
SCSF025225	1/4 BSF X 2.1/4 SOCKET CAPSCREW Out of Stock	£149.60 (exc VAT) per HUND £179.52 (inc VAT) per HUND	- +
SCSF025250	1/4 BSF X 2.1/2 SOCKET CAPSCREW Out of Stock	£165.00 (exc VAT) per HUND £198.00 (inc VAT) per HUND	- +
SCSF025275	1/4 BSF X 2.3/4 SOCKET CAPSCREW Out of Stock	Price Unavailable	- +
SCSF025300	1/4 BSF X 3" SOCKET CAPSCREW 37 In Stock for dispatch	Price Unavailable	- +
SCSF025350	1/4 BSF X 3.1/2 SOCKET CAPSCREW 6 In Stock for dispatch	Price Unavailable	- +
SCSF031050	5/16 BSF X 1/2 SOCKET CAPSCREW 162 In Stock for dispatch	£80.40 (exc VAT) per HUND £96.48 (inc VAT) per HUND	- +
SCSF031062	5/16 BSF X 5/8 SOCKET CAPSCREW 54 In Stock for dispatch	£110.88 (exc VAT) per HUND £133.06 (inc VAT) per HUND	- +
SCSF031075	5/16 BSF X 3/4 SOCKET CAPSCREW Out of Stock	£78.80 (exc VAT) per HUND £94.56 (inc VAT) per HUND	- +
SCSF031100	5/16 BSF X 1" SOCKET CAPSCREW 40 In Stock for dispatch	£109.00 (exc VAT) per HUND £130.80 (inc VAT) per HUND	- +
SCSF031125	5/16 BSF X 1.1/4 SOCKET CAPSCREW Out of Stock	Price Unavailable	- +
SCSF031150	5/16 BSF X 1.1/2 SOCKET CAPSCREW Out of Stock	Price Unavailable	- +
SCSF031175	5/16 BSF X 1.3/4 SOCKET CAPSCREW Out of Stock	£108.70 (exc VAT) per HUND £130.44 (inc VAT) per HUND	- +
SCSF031200	5/16 BSF X 2" SOCKET CAPSCREW 46 In Stock for dispatch	Price Unavailable	- +
SCSF031250	5/16 BSF X 2.1/2 SOCKET CAPSCREW Out of Stock	£149.90 (exc VAT) per HUND £179.88 (inc VAT) per HUND	- +
SCSF031300	5/16 BSF X 3" SOCKET CAPSCREW 30 In Stock for dispatch	Price Unavailable	- +
SCSF031350	5/16 BSF X 3.1/2 SOCKET CAPSCREW Out of Stock	Price Unavailable	- +
SCSF031400	5/16 BSF X 4" SOCKET CAPSCREW 30 In Stock for dispatch	Price Unavailable	- +
SCSF031450	5/16 BSF X 4.1/2 SOCKET CAPSCREW 25 In Stock for dispatch	Price Unavailable	- +
SCSF037075	3/8 BSF X 3/4 SOCKET CAPSCREW Out of Stock	£128.00 (exc VAT) per HUND £153.60 (inc VAT) per HUND	- +
SCSF037100	3/8 BSF X 1" SOCKET CAPSCREW 6 In Stock for dispatch	£117.49 (exc VAT) per HUND £140.99 (inc VAT) per HUND	- +
SCSF037125	3/8 BSF X 1.1/4 SOCKET CAPSCREW 180 In Stock for dispatch	£195.30 (exc VAT) per HUND £234.36 (inc VAT) per HUND	- +
SCSF037137	3/8 BSF X 1.3/8 SOCKET CAPSCREW Out of Stock	£239.60 (exc VAT) per HUND £287.52 (inc VAT) per HUND	- +
SCSF037150	3/8 BSF X 1.1/2 SOCKET CAPSCREW 91 In Stock for dispatch	£174.50 (exc VAT) per HUND £209.40 (inc VAT) per HUND	- +
SCSF037175	3/8 BSF X 1.3/4 SOCKET CAPSCREW Out of Stock	£115.30 (exc VAT) per HUND £138.36 (inc VAT) per HUND	- +
SCSF037200	3/8 BSF X 2" SOCKET CAPSCREW 1 In Stock for dispatch	Price Unavailable	- +
SCSF037200FT	3/8 BSF X 2" SOCKET CAPSCREW FULL THREAD 12 In Stock for dispatch	£1,680.00 (exc VAT) per HUND £2,016.00 (inc VAT) per HUND	- +
SCSF037250	3/8 BSF X 2.1/2 SOCKET CAPSCREW 1 In Stock for dispatch	£162.91 (exc VAT) per HUND £195.49 (inc VAT) per HUND	- +
SCSF037275	3/8" BSF X 2.3/4 SKT CAPSCREWS SELF COLOUR 50 In Stock for dispatch	£1,060.00 (exc VAT) per HUND £1,272.00 (inc VAT) per HUND	- +
SCSF037300	3/8 BSF X 3" SOCKET CAPSCREW 88 In Stock for dispatch	Price Unavailable	- +
SCSF037350	3/8 BSF X 3.1/2 SOCKET CAPSCREW Out of Stock	Price Unavailable	- +
SCSF037400	3/8 BSF X 4" SOCKET CAPSCREW Out of Stock	£535.00 (exc VAT) per HUND £642.00 (inc VAT) per HUND	- +
SCSF044125	7/16 BSF X 1.1/4 SOCKET CAPSCREW 6 In Stock for dispatch	Price Unavailable	- +
SCSF044150	7/16 BSF X 1.1/2 SOCKET CAPSCREW 72 In Stock for dispatch	Price Unavailable	- +
SCSF044175	7/16 BSF X 1.3/4 SOCKET CAPSCREW Out of Stock	£218.80 (exc VAT) per HUND £262.56 (inc VAT) per HUND	- +
SCSF044300	7/16 BSF X 3" SOCKET CAPSCREW Out of Stock	£622.10 (exc VAT) per HUND £746.52 (inc VAT) per HUND	- +
SCSF044475	7/16 BSF X 4.3/4" SOCKET CAPSCREW 6 In Stock for dispatch	£3,000.00 (exc VAT) per HUND £3,600.00 (inc VAT) per HUND	- +
SCSF050087	1/2 BSF X 7/8 SOCKET CAPSCREW 10 In Stock for dispatch	Price Unavailable	- +
SCSF050100	1/2 BSF X 1" SOCKET CAPSCREW 79 In Stock for dispatch	£160.60 (exc VAT) per HUND £192.72 (inc VAT) per HUND	- +
SCSF050125	1/2 BSF X 1.1/4 SOCKET CAPSCREW 47 In Stock for dispatch	Price Unavailable	- +
SCSF050150	1/2 BSF X 1.1/2 SOCKET CAPSCREW Out of Stock	£433.70 (exc VAT) per HUND £520.44 (inc VAT) per HUND	- +
SCSF050175	1/2 BSF X 1.3/4 SOCKET CAPSCREW Out of Stock	£552.10 (exc VAT) per HUND £662.52 (inc VAT) per HUND	- +
SCSF050200	1/2 BSF X 2" SOCKET CAPSCREW 40 In Stock for dispatch	£505.10 (exc VAT) per HUND £606.12 (inc VAT) per HUND	- +
SCSF050200FT	1/2 BSF X 2" SOCKET CAPSCREW FULL THREAD Out of Stock	£250.00 (exc VAT) per HUND £300.00 (inc VAT) per HUND	- +
SCSF050250	1/2 BSF X 2.1/2 SOCKET CAPSCREW 23 In Stock for dispatch	£300.20 (exc VAT) per HUND £360.24 (inc VAT) per HUND	- +
SCSF050300	1/2 BSF X 3" SOCKET CAPSCREW 30 In Stock for dispatch	£517.50 (exc VAT) per HUND £621.00 (inc VAT) per HUND	- +
SCSF050350	1/2 BSF X 3.1/2 SOCKET CAPSCREW Out of Stock	£387.80 (exc VAT) per HUND £465.36 (inc VAT) per HUND	- +
SCSF050400	1/2 BSF X 4" SOCKET CAPSCREW Out of Stock	£400.40 (exc VAT) per HUND £480.48 (inc VAT) per HUND	- +
SCSF050500	1/2 BSF X 5" SOCKET CAPSCREW Out of Stock	£1,200.00 (exc VAT) per HUND £1,440.00 (inc VAT) per HUND	- +
SCSF062100	5/8 BSF X 1" SOCKET CAPSCREW 1 In Stock for dispatch	Price Unavailable	- +
SCSF062150	5/8"BSF X 1.1/2" SOCKET HEAD CAPSCREWS 20 In Stock for dispatch	£401.30 (exc VAT) per HUND £481.56 (inc VAT) per HUND	- +
SCSF062175	5/8 BSF X 1.3/4 SOCKET CAPSCREW 4 In Stock for dispatch	Price Unavailable	- +
SCSF062200	5/8 BSF X 2" SOCKET CAPSCREW Out of Stock	£636.90 (exc VAT) per HUND £764.28 (inc VAT) per HUND	- +
SCSF062225	5/8 BSF X 2.1/4 SOCKET CAPSCREW Out of Stock	£496.80 (exc VAT) per HUND £596.16 (inc VAT) per HUND	- +
SCSF062250	5/8 BSF X 2.1/2 SOCKET CAPSCREW 1 In Stock for dispatch	£606.00 (exc VAT) per HUND £727.20 (inc VAT) per HUND	- +
SCSF062300	5/8"BSF X 3" SOCKET HEAD CAPSCREWS Out of Stock	£619.60 (exc VAT) per HUND £743.52 (inc VAT) per HUND	- +
SCSF062350	5/8 BSF X 3.1/2 SOCKET CAPSCREW Out of Stock	£1,131.80 (exc VAT) per HUND £1,358.16 (inc VAT) per HUND	- +
SCSF062375	5/8 BSF X 3.3/4 SOCKET CAPSCREW Out of Stock	£1,524.80 (exc VAT) per HUND £1,829.76 (inc VAT) per HUND	- +
SCSF062400	5/8 BSF X 4" SOCKET CAPSCREW Out of Stock	£1,835.52 (exc VAT) per HUND £2,202.62 (inc VAT) per HUND	- +
SCSF075150	3/4 BSF X 1.1/2 SOCKET CAPSCREW Out of Stock	£1,552.30 (exc VAT) per HUND £1,862.76 (inc VAT) per HUND	- +
SCSF075200	3/4 BSF X 2" SOCKET CAPSCREW 70 In Stock for dispatch	£373.60 (exc VAT) per HUND £448.32 (inc VAT) per HUND	- +
SCSF075250	3/4 BSF X 2.1/2 SOCKET CAPSCREW 30 In Stock for dispatch	Price Unavailable	- +
SCSF075300	3/4 BSF X 3" SOCKET CAPSCREW Out of Stock	£1,322.10 (exc VAT) per HUND £1,586.52 (inc VAT) per HUND	- +
SCSF075350	3/4 BSF X 3.1/2 SOCKET CAPSCREW 2 In Stock for dispatch	£1,480.50 (exc VAT) per HUND £1,776.60 (inc VAT) per HUND	- +
SCSF075400	3/4 BSF X 4" SOCKET CAPSCREW Out of Stock	£3,808.70 (exc VAT) per HUND £4,570.44 (inc VAT) per HUND	- +
SCSF075450	3/4 BSF X 4.1/2" SOCKET CAPSCREW Out of Stock	£5,721.75 (exc VAT) per HUND £6,866.10 (inc VAT) per HUND	- +
SCSF075500	3/4 BSF X 5" SOCKET CAPSCREW Out of Stock	Price Unavailable	- +
SCSF075600	3/4 BSF X 6" SOCKET CAPSCREW 3 In Stock for dispatch	£5,840.29 (exc VAT) per HUND £7,008.35 (inc VAT) per HUND	- +
SCSF087150	7/8 BSF X 1.1/2 SOCKET CAPSCREW 98 In Stock for dispatch	Price Unavailable	- +
SCSF087175	7/8 BSF X 1.3/4 SOCKET CAPSCREW 47 In Stock for dispatch	Price Unavailable	- +
SCSF087200	7/8 BSF X 2" SOCKET CAPSCREW Out of Stock	£6,100.00 (exc VAT) per HUND £7,320.00 (inc VAT) per HUND	- +
SCSF087400	7/8 BSF X 4" SOCKET CAPSCREW Out of Stock	£5,133.30 (exc VAT) per HUND £6,159.96 (inc VAT) per HUND	- +
SCSF087500	7/8 BSF X 5" SOCKET CAPSCREW 2 In Stock for dispatch	Price Unavailable	- +
SCSF100200	1" BSF X 2" SOCKET CAPSCREW Out of Stock	£5,461.10 (exc VAT) per HUND £6,553.32 (inc VAT) per HUND	- +
SCSF100300	1" BSF X 3" SOCKET CAPSCREW Out of Stock	£15,000.00 (exc VAT) per HUND £18,000.00 (inc VAT) per HUND	- +
SCSF100500	1" BSF X 5" SOCKET CAPSCREW 6 In Stock for dispatch	£5,680.00 (exc VAT) per HUND £6,816.00 (inc VAT) per HUND	- +

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