Please log in here to access all benefits, including promotional discounts and faster checkouts.
JBO Plug Gauge - UNC (STI) Heli Coil Gauge - Right Hand - 2B - 5/16 x 18 - Calibrated (DAkkS Calibration)
| Thread Form | UNC (STI) |
| Size | 5/16 |
| Pitch | 18 |
| Gauge Type | Plug Gauge (D/E) |
| Thread Direction | Right Hand |
| Tolerance | 2B |
Learn more about Klarna
The JBO Plug Gauge - UNC (STI) Right Hand, 2B, 5/16 x 18, Calibrated with DAkkS traceability, is a precision measuring tool designed specifically for UNC (Unified National Coarse) Screw Thread Inserts (STIs). This gauge helps professionals quickly verify the pitch diameter and overall fit of STI inserts, ensuring reliable engagement and proper assembly in your projects.
Manufactured and assessed in accordance with ANSI/ASME thread system standards, the JBO UNC plug gauge delivers consistent, repeatable measurements across manufacturing, automotive, and aerospace applications. The DAkkS-calibrated design provides auditable calibration data for quality control programs and compliance requirements.
- DAkkS-calibrated, traceable measurements: Provides auditable, repeatable pitch-diameter checks with certified calibration records that support quality audits.
- UNC (STI) right-hand compatibility: Optimized for UNC STI 5/16 x 18 inserts, delivering reliable readings to verify correct pitch diameter and fit.
- Durable, user-friendly design: Knurled, rugged body and robust interfaces resist wear in busy workshops, offering comfortable handling and quick setup.
Using this gauge helps you ensure inserts meet exact UNC STI specifications, streamline inspection workflows, and reduce rework caused by incorrect pitch diameter. The combination of DAkkS-calibrated accuracy and a durable, easy-to-use design supports efficient quality control and confident procurement or production decisions.
| Thread Form | UNC (STI) |
| Size | 5/16 |
| Pitch | 18 |
| Gauge Type | Plug Gauge (D/E) |
| Thread Direction | Right Hand |
| Tolerance | 2B |
| Calibration | DAkkS Calibration Cert |
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-512703. 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 | £151.32 | 5 days | |
| JBO-512694 | No. 5 | 40 | £150.21 | 5 days | |
| JBO-512695 | No. 6 | 32 | £134.87 | 5 days | |
| JBO-512697 | No. 8 | 32 | £127.21 | 5 days | |
| JBO-512687 | No. 10 | 24 | £124.99 | 5 days | |
| JBO-512688 | No. 12 | 24 | £141.45 | 5 days | |
| JBO-512700 | 1/4 | 20 | £124.99 | 5 days | |
| JBO-512703 Viewing | 5/16 | 18 | £134.87 | 5 days | |
| JBO-512702 | 3/8 | 16 | £149.13 | 5 days | |
| JBO-512699 | 1/2 | 13 | £243.43 | 5 days | |
| JBO-512704 | 5/8 | 11 | £256.58 | 5 days | |
| JBO-513095 | No. 4 | 48 | £164.47 | 5 days | |
| JBO-512707 | No. 6 | 40 | £143.64 | 5 days | |
| JBO-512709 | No. 8 | 36 | £132.68 | 5 days | |
| JBO-512705 | No. 10 | 32 | £124.99 | 5 days | |
| JBO-512712 | 1/4 | 28 | £124.99 | 5 days | |
| JBO-512716 | 5/16 | 24 | £134.87 | 5 days | |
| JBO-512715 | 3/8 | 24 | £149.13 | 5 days | |
| JBO-513343 | 7/16 | 20 | £184.22 | 5 days | |
| JBO-512711 | 1/2 | 20 | £243.43 | 5 days | |
| JBO-512718 | 5/8 | 18 | £253.31 | 5 days | |
| JBO-512693 | No. 4 | 40 | £235.75 | 5 days | |
| JBO-512696 | No. 6 | 32 | £211.63 | 5 days | |
| JBO-512698 | No. 8 | 32 | £200.65 | 5 days | |
| JBO-512706 | No. 10 | 32 | £196.27 | 5 days | |
| JBO-512713 | 1/4 | 28 | £196.27 | 5 days | |
| JBO-512717 | UNF (STI) | 5/16 | £212.72 | 5 days |
No products match your filters.
