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BSF (British Standard Fine) Thread Data.

Since 1908 this thread, in conjunction with BSW (British Standard Whitworth) has been the mainstay of British Engineering, and was used when finer pitches were required.

Angle of thread = 55 degrees

British Standard Fine (BSF)

BSF Thread Profile

A finer pitch series, analogous to the American Unified Fine (UNF), although - unlike the case of BSW/UNC - with none of the pitches in common with UNF. Many motorcar and motorcycle manufacturers commonly used a lot of BSF threads.

Diameter
Inches
T P I Pitch
inches
Core
Diameter
Tapping Drill Size
3/16 32 0.0313 0.1475 5/32 inch
(3.97 mm)
7/32 28 0.0357 0.173 Number drill 15
(4.6 mm)
1/4 26 0.0385 0.2008 Number drill 6
(5.3 mm)
5/16 22 0.0455 0.2543 17/64 inch
(6.75 mm)
3/8 20 0.05 0.311 Letter drill P
(8.2 mm)
7/16 18 0.0556 0.3663 9.7 mm
(0.3819 inch)
1/2 16 0.0625 0.42 7/16 inch
(11.11 mm)
9/16 16 0.0625 0.4825 1/2 inch
(12.7 mm)
5/8 14 0.0714 0.5336 14mm
(0.5512 inch)
11/16 14 0.0714 0.5961 15.5 mm
(0.6102 inch)
3/4 12 0.0833 0.6432 16.75 mm
(0.6594 inch)
7/8 11 0.0909 0.7586 25/32 inch
(19.84 mm)
1 inch 10 0.1 0.872 22.75 mm
(0.8957 inch)

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