British Standard Fine
Template:Short description British Standard Fine (BSF) is a screw thread form, as a fine-pitch alternative to British Standard Whitworth (BSW) thread. It was used for steel bolts and nuts on and in much of Britain's machinery, including cars, prior to adoption of Unified, and later Metric, standards. For highly stressed conditions, especially in motorcycles, a finer thread, British Standard Cycle (BSC), was used as well.
BSF was developed by R. E. B. Crompton, and his assistant George Field.[1]Script error: No such module "Unsubst". BSF threads use the 55 degree Whitworth thread form. It was introduced by the British Engineering Standards Association in 1908.[2]
The table provides BSF sizes, the threads per inch and spanner jaw sizes. The BSC column indicates where BSF and BSC threads match. The table shows suitable tapping drill sizes. Uncommon sizes are shown in italics.
Table
Diameter Thread
densityAs
BSC?Nut,
approximateTap drill (in) (mm) (in−1) (mm) (in) <templatestyles src="Fraction/styles.css" />3⁄16 Script error: No such module "convert". 32 Yes Script error: No such module "convert". 6pt <templatestyles src="Fraction/styles.css" />5⁄32 in <templatestyles src="Fraction/styles.css" />7⁄32 Script error: No such module "convert". 28 No 4.6 mm <templatestyles src="Fraction/styles.css" />1⁄4 Script error: No such module "convert". 26 Yes 11.30 5.3 mm <templatestyles src="Fraction/styles.css" />5⁄16 Script error: No such module "convert". 22 No Script error: No such module "convert". <templatestyles src="Fraction/styles.css" />17⁄64 in <templatestyles src="Fraction/styles.css" />3⁄8 Script error: No such module "convert". 20 Script error: No such module "convert". 8.2 mm <templatestyles src="Fraction/styles.css" />7⁄16 Script error: No such module "convert". 18 Script error: No such module "convert". 9.7 mm <templatestyles src="Fraction/styles.css" />1⁄2 Script error: No such module "convert". 16 Script error: No such module "convert". <templatestyles src="Fraction/styles.css" />7⁄16 in <templatestyles src="Fraction/styles.css" />9⁄16 Script error: No such module "convert". 16 Script error: No such module "convert". <templatestyles src="Fraction/styles.css" />1⁄2 in <templatestyles src="Fraction/styles.css" />5⁄8 Script error: No such module "convert". 14 Script error: No such module "convert". 6pt 14 mm <templatestyles src="Fraction/styles.css" />11⁄16 Script error: No such module "convert". 14 Script error: No such module "convert". 6pt 15.5 mm <templatestyles src="Fraction/styles.css" />3⁄4 Script error: No such module "convert". 12 Script error: No such module "convert". 6pt 16.75 mm <templatestyles src="Fraction/styles.css" />7⁄8 Script error: No such module "convert". 11 Script error: No such module "convert". <templatestyles src="Fraction/styles.css" />25⁄32 in 1 Script error: No such module "convert". 10 Script error: No such module "convert". 22.75 mm <templatestyles src="Fraction/styles.css" />1+1⁄8 Script error: No such module "convert". 9 Script error: No such module "convert". 26.50 mm <templatestyles src="Fraction/styles.css" />1+1⁄4 Script error: No such module "convert". 9 Script error: No such module "convert". 28.75 mm <templatestyles src="Fraction/styles.css" />1+1⁄2 Script error: No such module "convert". 8 Script error: No such module "convert". 34.50 mm
References
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Bibliography
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