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JBO Thread Ring Gauge (GO) - BSF - Right Hand - Medium Class - 3/8 x 20
| Thread Form | BSF |
| Size | 3/8 |
| Pitch | 20 |
| Gauge Type | Ring Gauge (GO) |
| Thread Direction | Right Hand |
| Tolerance | Medium Class |
Learn more about Klarna
Meet the JBO Thread Ring Gauge (GO) for BSF—your go-to tool for verifying external thread diameters on right-hand BSF fasteners. Designed for machinists, inspectors, and production teams, it provides fast, reliable GO checks to confirm the 3/8 x 20 BSF size with medium-class tolerance is met. Built for daily use in busy workshops, this gauge combines precise dimensions with robust materials to deliver consistent results over time.
- Go/No-Go quick checks: Enables fast GO testing of external threads to verify diameter and pitch accuracy, speeding inspections and reducing rework in quality control.
- Durable hardened steel construction: Withstands wear and heavy use, maintaining measurement accuracy and extending service life in demanding shop environments.
- BSF Right-Hand 3/8 x 20, Medium Class accuracy: Precisely matched to the specified BSF right‑hand thread and tolerance, delivering reliable, repeatable results across parts and suppliers.
This gauge streamlines inspection workflows by providing a clear, tactile check for properly conforming threads. Its dedicated sizing and rugged build support consistent results, helping you meet tight production schedules, reduce downtime, and maintain high-quality standards across projects.
| Thread Form | BSF |
| Size | 3/8 |
| Pitch | 20 |
| Gauge Type | Ring Gauge (GO) |
| Thread Direction | Right Hand |
| Tolerance | Medium Class |
What time are Protool open?
We are open Monday to Friday between 8:30am and 5pm.
Do you offer Free Next Day delivery?
Yes! We offer Free Next Day delivery via Royal Mail Tracked 24 on all orders over £50 ex VAT*. We also offer Free DPD Local Next Day delivery on all orders over £100 ex VAT*.
We also offer the following:
- Royal Mail Tracked 24 — £5.90 (FREE on orders over £50 ex VAT*). Order before 4:30pm for next day delivery. No signature required.
- DPD Local Next Day — £8.00 (FREE on orders over £100 ex VAT*). Standard next day delivery to UK mainland addresses.
- Royal Mail Special Delivery — £12.50. Guaranteed delivery before 1pm the next working day.
- DPD Saturday Delivery — £25.00. Must be ordered on Friday before 4pm. Pre-12pm delivery.
For delivery to Scottish Highlands & Islands, Northern Ireland, Republic of Ireland, or overseas locations, additional charges apply. Please see our delivery page for full details, or call us on 01732 887 334.
*T's & C's and exclusions apply. Please see our delivery page for more information on all our services.
Full Range: JBO Thread Ring Gauges (GO) - BSF
View full collection →You are viewing JBO-502500. Click any other SKU to view its full details.
| Product SKU | Size | Pitch | Price | Stock | Order |
|---|---|---|---|---|---|
| JBO-540040 | 3/16 | 32 | £97.75 | 5 days | |
| JBO-520234 | 7/32 | 28 | £105.24 | 5 days | |
| JBO-502498 | 1/4 | 26 | £90.49 | 5 days | |
| JBO-520235 | 9/32 | 26 | £105.24 | 5 days | |
| JBO-502501 | 5/16 | 22 | £94.97 | 5 days | |
| JBO-502500 Viewing | 3/8 | 20 | £102.55 | 5 days | |
| JBO-520236 | 7/16 | 18 | £111.09 | 5 days | |
| JBO-502497 | 1/2 | 16 | £113.23 | 5 days | |
| JBO-507251 | 9/16 | 16 | £126.06 | 5 days | |
| JBO-520237 | 5/8 | 14 | £129.26 | 5 days | |
| JBO-520238 | 11/16 | 14 | £157.04 | 5 days | |
| JBO-502499 | 3/4 | 12 | £146.34 | 5 days | |
| JBO-540035 | 7/8 | 11 | £164.51 | 5 days | |
| JBO-502496 | 1 | 10 | £189.08 | 5 days |
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