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JBO Plug Gauge - UNF (STI) Heli Coil Gauge - Right Hand - 2B - 3/8 x 24 - Calibrated (DAkkS Calibration)
| Thread Form | UNF (STI) |
| Size | 3/8 |
| Pitch | 24 |
| Gauge Type | Plug Gauge (D/E) |
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Description
The JBO Plug Gauge - UNF (STI) Heli Coil Gauge is a precision, calibrated plug gauge designed to inspect Helicoil‑style screw-thread inserts. This right‑hand gauge, sized 3/8 x 24 and class 2B, helps technicians quickly verify insert engagement and fit across manufacturing, automotive, and aerospace applications. Its knurled body and color‑coded end caps provide a secure grip and intuitive orientation in busy shop environments.
Manufactured and assessed to ANSI/ASME thread standards, this gauge aligns with established industry specifications for STI inserts. It is calibrated to DAkkS standards, offering traceable accuracy for quality audits and supplier qualification. The tool’s robust construction is built to endure daily use in workshop conditions, delivering dependable performance over time.
- ANSI/ASME-compliant gauge design: Built to industry thread standards, ensuring consistent, repeatable inspections that align with STI insert specifications and reduce ambiguity in QA checks.
- Precise pitch-diameter verification: Enables accurate measurement of pitch diameter to guarantee proper insert fit and reliable performance in assembled components.
- DAkkS-calibrated for traceable accuracy: Provides documented, DAkkS-traceable calibration for audits, quality systems, and supplier qualification.
Using the JBO UNF (STI) Plug Gauge helps you streamline inspection workflows, reduce rework from misfits, and maintain confidence across production runs. With its durable build, industry-standard compliance, and traceable calibration, you can trust consistent results from the first part to the last.
Part Numbers
- Protool Part Number
- JBO-512715
- 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-512715. 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 | 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 Viewing | 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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