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JBO Plug Gauge - UNC (STI) Heli Coil Gauge - Right Hand - 2B - 1/4 x 20 - Calibrated (DAkkS Calibration)
| Thread Form | UNC (STI) |
| Size | 1/4 |
| Pitch | 20 |
| Gauge Type | Plug Gauge (D/E) |
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Description
The JBO Plug Gauge for UNC (STI) right-hand 1/4 x 20, 2B is a precision measuring tool designed specifically to verify UNC STI wire inserts (Helicoil). It provides quick, reliable checks of pitch diameter to ensure inserts fit and perform as intended in assemblies across manufacturing, automotive, and aerospace applications.
Manufactured and assessed in accordance with ANSI/ASME thread system standards, this gauge carries DAkkS calibration for traceable, high-accuracy measurements. It is an ideal choice for quality control environments where consistent thread guidance and insert integrity are essential.
- DAkkS-Calibrated for Precision: DAkkS calibration delivers traceable accuracy, supporting audit trails and precise acceptance testing.
- UNC (STI) Compatibility and 2B Tolerance: Specifically crafted to verify UNC STI wire inserts with 2B tolerance, confirming correct pitch diameter for 1/4 x 20 right-hand threads.
- Rugged, Precision-Engineered Build: Knurled body with precision-machined ends provides durable, repeatable measurements in busy shop environments.
In everyday use, this gauge helps inspectors and technicians quickly validate insert quality, streamline QA workflows, and reduce guesswork when pairing inserts with housings or components. Its calibrated accuracy, UNC STI alignment, and robust construction translate to more consistent results, fewer reworks, and greater confidence across production and assembly processes.
Part Numbers
- Protool Part Number
- JBO-512700
- Brand
- JBO
- Category
- Gauge
Need cutting data? Call 01732 887334 or email sales@protool-ltd.co.uk.
Delivery
Free UK mainland delivery on orders over £50 ex VAT. In-stock items ordered before 4:30pm are dispatched the same working day. Full delivery information.
Returns
14-day returns on unused stock items in original packaging. Special-order and bespoke tooling is non-returnable. Read our returns policy.
Technical Support
Over 30 years of machining experience behind the counter. Call 01732 887334, Mon–Thurs 8:30–17:30, Fri 8:30–16:30.
Trade Accounts
Credit accounts, contract pricing and scheduled call-off orders available for trade customers. Apply for an account.
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 Plug Gauge UNC Heli Coil - Right Hand - 3B - Calibrated (DAkkS Calibration)
View full collection →You are viewing JBO-512700. Click any other SKU to view its full details.
| Product SKU | Size | Pitch | Price | Stock | Order |
|---|---|---|---|---|---|
| JBO-512689 | No. 2 | 56 | £167.77 | 5 days | |
| JBO-512692 | No. 4 | 40 | £214.08 | 5 days | |
| JBO-512694 | No. 5 | 40 | £212.97 | 5 days | |
| JBO-512695 | No. 6 | 32 | £197.63 | 5 days | |
| JBO-512697 | No. 8 | 32 | £189.95 | 5 days | |
| JBO-512687 | No. 10 | 24 | £187.75 | 5 days | |
| JBO-512688 | No. 12 | 24 | £204.20 | 5 days | |
| JBO-512700 Viewing | 1/4 | 20 | £187.75 | 5 days | |
| JBO-512703 | 5/16 | 18 | £197.63 | 5 days | |
| JBO-512702 | 3/8 | 16 | £211.89 | 5 days | |
| JBO-512699 | 1/2 | 13 | £306.19 | 5 days | |
| JBO-512704 | 5/8 | 11 | £319.34 | 5 days | |
| JBO-513095 | No. 4 | 48 | £227.23 | 5 days | |
| JBO-512707 | No. 6 | 40 | £206.40 | 5 days | |
| JBO-512709 | No. 8 | 36 | £195.44 | 5 days | |
| JBO-512705 | No. 10 | 32 | £187.75 | 5 days | |
| JBO-512712 | 1/4 | 28 | £187.75 | 5 days | |
| JBO-512716 | 5/16 | 24 | £197.63 | 5 days | |
| JBO-512715 | 3/8 | 24 | £211.89 | 5 days | |
| JBO-513343 | 7/16 | 20 | £246.96 | 5 days | |
| JBO-512711 | 1/2 | 20 | £306.19 | 5 days | |
| JBO-512718 | 5/8 | 18 | £316.05 | 5 days | |
| JBO-512693 | No. 4 | 40 | £298.51 | 5 days | |
| JBO-512696 | No. 6 | 32 | £274.37 | 5 days | |
| JBO-512698 | No. 8 | 32 | £263.41 | 5 days | |
| JBO-512706 | No. 10 | 32 | £259.03 | 5 days | |
| JBO-512713 | 1/4 | 28 | £259.03 | 5 days | |
| JBO-512717 | UNF (STI) | 5/16 | £275.48 | 5 days |
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