Precision Thread Plug Gauge BSW 1/4-20 Go and NoGo
Product Description
The BSW thread plug gauge is designed to verify the accuracy of internal BSW (British Standard Whitworth) screw threads. Developed by Joseph Whitworth, these threads feature a 55-degree thread angle. These precision gauges are essential for ensuring proper fit and interchangeability of parts, particularly in applications using the Whitworth thread standard.
Quick Details
- British Standard Whitworth (BSW) thread.
- Material: GCR15 bearing steel.
- Available in both right-hand (RH) and left-hand (LH) configurations.
- Wear-resistant and corrosion-resistant construction.
- Stable structure for easy operation.
- Supplied in a fitted protective case.
Specifications
| Size |
Major Diameter (mm) |
Pitch (mm) |
Threads per inch |
Thread Height (mm) |
Tap Drill Diameter (mm) |
| 1/16" |
1.587 |
0.423 |
60 |
0.270 |
1.15 |
| 3/32" |
2.381 |
0.529 |
48 |
0.338 |
1.90 |
| 1/8" |
3.175 |
0.635 |
40 |
0.406 |
2.50 |
| 5/32" |
3.969 |
0.793 |
32 |
0.507 |
3.20 |
| 3/16" |
4.762 |
1.058 |
24 |
0.677 |
3.70 |
| 7/32" |
5.556 |
1.058 |
24 |
0.677 |
4.50 |
| 1/4" |
6.350 |
1.270 |
20 |
0.813 |
5.10 |
| 5/16" |
7.938 |
1.411 |
18 |
0.904 |
6.50 |
Applications
- Inspect internal BSW threads (nuts, threaded holes) for correct pitch diameter and form compliance.
- Verify BSW threads in legacy British-engineered equipment or military hardware.
- Check threaded components in vintage vehicles or machinery using Whitworth standards.
- Ensure proper sealing in pipe fittings with BSW threads (hydraulic systems).
- Assess wear/damage in existing BSW threads during overhaul or reassembly.
- Confirm compatibility between BSW-threaded parts from different manufacturers.
Precautions
- Use only for gauge inspection purposes - functional sharp parts may cause injury.
- Before use, inspect for rust, scratches, or burrs and clean with oil or cloth.
- Apply anti-rust lubricating oil during use and avoid impact.
- Store in a dry, temperature-stable environment after removing dust and chips.
- Perform regular maintenance checks.
Frequently Asked Questions
Who are we?
Deko Corporation specializes in the development, manufacture, and marketing of KM brand precision measuring tools in China mainland.
What products do we carry?
Our product range includes dial indicators, micrometers, calipers, bore gauges, height gauges, dial thickness gauges, depth gauges, bevel protractors, gauge blocks, levels, and more.
What are the terms of trade?
We support FOB, CFR, CIF, and EXW trade terms.
What are the forms of payment?
We accept T/T, L/C, D/A, D/P, PayPal, and etc..
Do we accept customization?
Yes, OEM services are available.
How about after-sales service?
All products come with a one-year warranty. If you receive defective items, we will ship replacement parts or products. Our strict calibration and inspection processes ensure product quality.
