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 much British machinery, including cars, prior to adoption of Unified, and later Metric, standards.
| Product ID | Description | | | |
|---|
| BBSF.25*.75 | 1/4 x 3/4 BSF Bolts Only | | | |
| BBSF.25*1.75 | 1/4 x 1.3/4 BSF Bolts Only | | | |
| BBSF.25*2.0 | 1/4 x 2 BSF Bolts Only | | | |
| BBSF.31*1.50 | 5/16 x 1.1/2 BSF Bolts Only | | | |
| BBSF.31*1.75 | 5/16 x 1.3/4 BSF Bolts Only | | | |
| BBSF.31*2.0 | 5/16 x 2 BSF Bolts Only | | | |
| BBSF.31*3.5 | 5/16 x 3.1/2 BSF Bolts Only | | | |
| BBSF.37*1.0 | 3/8 x 1 BSF Bolts Only | | | |
| BBSF.37*1.25 | 3/8 x 1.1/4 BSF Bolts Only | | | |
| BBSF.37*3.5 | 3/8 x 3.1/2 BSF Bolts Only | | | |
| BBSF.43*1.5 | 7/16 x 1.1/2 BSF Bolts Only | | | |
| BBSF.50*2.0 | 1/2 x 2 BSF Bolts Only | | | |
| BBSF.50*4.0 | 1/2 x 4 BSF Bolts Only | | | |
| BBSF.62*1.5 | 5/8 x 1.1/2 BSF Bolts Only | | | |
| BBSF.62*4.0 | 5/8 x 4 BSF Bolts Only | | | |
| BBSF.75*2.0 | 3/4 x 2 BSF Bolts Only | | | |
| BBSF.75*3.0 | 3/4 x 3 BSF Bolts Only | | | |
