- Metric Thread
- Metric Thread - Bolt Torque table
- Metric Thread - Pitch
- Metric Thread - Tap Drill table
- Metric Thread - Clearance Hole table
- Metric Fine Thread - Bolt Torque table
- Metric Fine Thread - Pitch
- Metric Fine Thread - Tap Drill table
- Metric Wrench Sizes
- Sheet Metal Screws Pilot Hole Sizes
- Cable Gland Sizes
- Trapezoidal Thread Sizes
- Cutting Metric Thread
- Inch Thread
- The Screw
- Drill correctly
- Which Dowel
- Materials
- Language
BSW Threads - Whitworth
The BSW thread (British Standard Whitworth) is the British Standard thread. It is used in England as often as the metric thread in Germany. The thread sizes are marked with the abbreviation "W". The American UNC thread is very similar to the BSW thread..
Example of a hexagon head bolt:
Designation: 1/4" - 20 BSW x 3/4"
1/4" is the length of the screw measured under the head
20 is the number of threads per inch and "BSW" is the type of thread.
3/4" is the nominal diameter of the screw.
BSW Threads Chart
|
Thread Sizes |
Thread Pitch (mm) |
outer diameter (mm) |
Core Hole diameter (mm) |
Gear number pro Inch |
| W 1/16" | 0,423 | 1,588 | 1,15 | 60 |
| W 3/32" | 0,529 | 2,381 | 1,85 | 48 |
| W 1/8" | 0,635 | 3,175 | 2,55 | 40 |
| W 5/32" | 0,794 | 3,969 | 3,20 | 32 |
| W 3/16" | 1,058 | 4,763 | 3,70 | 24 |
| W 7/32" | 1,058 | 5,556 | 4,50 | 24 |
| W 1/2" | 2,117 | 6,350 | 10,50 | 12 |
| W 9/16" | 2,117 | 7,940 | 12,00 | 12 |
| W 5/8" | 2,309 | 9,525 | 13,50 | 11 |
| W 3/4" | 2,540 | 11,113 | 16,50 | 10 |
| W 7/8" | 2,822 | 22,225 | 19,25 | 9 |
| W 1" | 3,175 | 25,400 | 22,00 | 8 |
| W 1 1/8" | 3,628 | 28,575 | 24,75 | 7 |
| W 1 1/4" | 3,628 | 31,750 | 27,75 | 7 |
| W 1 3/8" | 4,233 | 34,925 | 30,50 | 6 |
| W 1 1/2" | 4,233 | 38,100 | 33,50 | 6 |
| W 1 5/8" | 5,080 | 41,275 | 35,50 | 6 |
| W 1 3/4" | 5,080 | 44,450 | 39,00 | 5 |
| W 1 7/8" | 5,644 | 47,625 | 41,50 | 4 1/2 |
| W 2" | 5,644 | 50,800 | 44,50 | 4 1/2 |
| W 2 1/4" | 6,350 | 57,150 | 50,00 | 4 |
| W 2 1/2" | 6,350 | 63,500 | 56,50 | 4 |
| W 2 3/4" | 7,257 | 69,850 | 62,00 | 3 1/2 |
| W 3" | 7,257 | 76,200 | 68,00 | 3 1/2 |
| W 3 1/4" | 7,815 | 82,550 | 74,00 | 3 1/4 |
| W 3 1/2" | 7,815 | 88,900 | 80,50 | 3 1/4 |
| W 3 3/4" | 8,467 | 95,250 | 86,00 | 3 |
| W 4" | 8,467 | 101,600 | 92,50 | 3 |
* All information without guarantee.
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