Please log in here to access all benefits, including promotional discounts and faster checkouts.

VCOIL Plug Gauge (D/E) - BSF (STI) - Heli Coil Gauge - Right Hand - Medium - 3/8 x 20
| Thread Form | BSF (STI) |
| Size | 3/8 |
| Pitch | 20 |
| Gauge Type | Plug Gauge (D/E) |
Learn more about Klarna
Compatible certification
The ones our customers buy most.Description
VCOIL Plug Gauge (D/E) for BSF (STI) right-hand, medium, 3/8 x 20 is a precision go/no-go thread gauge designed for helicoil insert applications. Manufactured and assessed to ANSI/ASME thread standards, this gauge helps you verify threaded holes quickly and consistently in shop environments.
- End design: Combined go and no-go plug gauge in one instrument for efficient inspection of 3/8 x 20 BSF threads.
- Go end: Must screw into the thread cut into a part by hand (without excessive force) to indicate a compliant thread.
- No-Go end (scrap side): Should not be able to be manually turned more than two complete turns into the cut thread, indicating non-compliance.
- Scrap marking: Scrap side is marked with a red ring for immediate visual identification.
- Standard and compatibility: Aligns with ANSI/ASME thread system for Helicoil gauges, with BSF (STI) threads.
- Size and orientation: Right-handed thread, medium size, 3/8 x 20.
- Temperature reference: Uses a reference temperature of 20°C for parts and gauges to ensure consistent measurements.
The gauge provides quick, pass/fail verification of helicoil hole threads, helping to reduce guesswork and scrap. By following the go/no-go criteria precisely, you can maintain consistent thread quality across production runs and ensure compatibility with standard helicoil inserts.
Part Numbers
- Protool Part Number
- TC-19873
- Brand
- VCOIL
- 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: VCOIL Plug Gauges BSF (STI)
View full collection →You are viewing TC-19873. Click any other SKU to view its full details.
| Product SKU | Size | Pitch | Price | Stock | Order |
|---|---|---|---|---|---|
| TC-19870 | 3/16 | 32 | £119.25 | In Stock | |
| TC-19871 | 1/4 | 26 | £119.25 | In Stock | |
| TC-19872 | 5/16 | 22 | £119.25 | In Stock | |
| TC-19873 Viewing | 3/8 | 20 | £137.80 | In Stock | |
| TC-19874 | 7/16 | 18 | £129.85 | In Stock | |
| TC-19875 | 1/2 | 16 | £176.23 | In Stock | |
| TC-19876 | 9/16 | 16 | £188.15 | In Stock | |
| TC-19877 | 5/8 | 14 | £209.35 | In Stock | |
| TC-19878 | 3/4 | 12 | £221.28 | In Stock | |
| TC-19879 | 7/8 | 11 | £231.88 | 7 days | |
| TC-19880 | 1 | 11 | £298.13 | 7 days |
No products match your filters.



