BSW/BSF/Withword Thread Gauges
BSW / BSF / Whitworth threads are used where clearance between male & female threads is to be controlled.
This uses Imperial system of units.
Specification :
Basic Dimensions- BS 84-2007 & Gauging Practice: BS 919 Part II – 2007.
Manufacturing Range :
Thread Plug & Ring Gauges from Diameter 1/8 to 6″ , TPI 40 to 2.5
| Dia. Inch | BSW | BSF | BSB | Type of Thread Gauges used | |||
|---|---|---|---|---|---|---|---|
| 8-Jan | 40 | - | 26 | Thread Plug Gauges. | Thread | Check | Wear |
| 16-Mar | 24 | 32 | 26 | Ring Gauges. | Plug Gauges to Check | Check Plug Gauges to Check / Calibrate | |
| * 7/32 | - | 28 | * | New Rings. | used Rings. | ||
| 1/4 | 20 | 26 | 26 | ||||
| 5/16 | 18 | 22 | 26 | ||||
| 3/8 | 16 | 20 | 26 | ||||
| 7/16 | 14 | 18 | 26 | ||||
| 1/2 | 12 | 16 | 26 | ||||
| *9/16 | 12 | 16 | 26 | ||||
| 5/8 | 11 | 14 | 26 | ||||
| *11/16 | 11 | 14 | * | ||||
| 3/4 | 10 | 12 | 26 | ||||
| 7/8 | 9 | 11 | 26 | ||||
| 1 | 8 | 10 | 26 | ||||
| 1.1/8 | 7 | 9 | 26 | ||||
| 1.1/4 | 7 | 9 | 26 | ||||
| *1.3/8 | - | 8 | 26 | ||||
| .1/2 | -6 | -8 | 26 | ||||
| 1.3/4 | -5 | -7 | 26 | ||||
| 2 | -4.5 | -7 | 26 | ||||
| 2.1/4 | -4 | -6 | * | ||||
| 2.1/2 | -4 | -6 | * | ||||
| 2.3/4 | -3.5 | -6 | * | ||||
| 3 | -3.5 | -5 | * | ||||
| *3.1/4 | -3.25 | -5 | * | ||||
| 3.1/2 | -3.25 | -4.5 | * | ||||
| *3.3/4 | -3 | -4.5 | * | ||||
| 4 | -3 | -4.5 | * | ||||
| 4.1/2 | -2.875 | -4 | * | ||||
| 5 | -2.75 | - | * | ||||
| 5.1/2 | -2.625 | - | * | ||||
| 6 | -2.5 | - | * |