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JBO Plug Gauge - UNC (STI) Heli Coil Gauge - Right Hand - 3B - 5/16 x 24 - Calibrated (DAkkS Calibration)
| Thread Form | UNF (STI) |
| Size | 5/16 |
| Pitch | 24 |
| Gauge Type | Plug Gauge (D/E) |
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Description
The JBO Plug Gauge for UNC (STI) right-hand threads is a class 3B plug gauge sized for 5/16 x 24 UNC screw thread inserts. Calibrated to DAkkS standards, this gauge provides traceable, high-precision measurements essential for quality control in manufacturing, automotive, and aerospace environments.
Designed to verify pitch diameter with clarity and speed, it helps you confirm the correct fit and reliable performance of threaded inserts across production and inspection workflows. Its robust construction supports daily use on the shop floor, while its precise dimensions ensure consistent results aligned with UNC STI specifications.
- UNC (STI) pitch-diameter verification: Enables precise measurement of pitch diameter for reliable insert fit and smooth engagement during assembly, reducing misfits and returns.
- DAkkS-calibrated, traceable accuracy: Provides certified, auditable measurement results that integrate with quality systems and ISO 17025 compliance.
- Durable, right-hand 3B design: Built for daily use with a rugged knurled body and sturdy ends, delivering consistent performance with minimal maintenance.
Whether you’re validating new batches or performing routine QA, this gauge streamlines inspections, shortens setup times, and helps you maintain tight tolerances across your threaded-insert applications.
Part Numbers
- Protool Part Number
- JBO-512717
- 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-512717. Click any other SKU to view its full details.
| Product SKU | Thread Form | Size | Pitch | Gauge Type | Thread Direction | Tolerance | 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 | 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 Viewing | UNF (STI) | 5/16 | 24 | Plug Gauge (D/E) | Right Hand | 3B | £275.48 | 5 days |
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