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VCOIL Plug Gauge (D/E) - UNF (STI) - Heli Coil Gauge - Right Hand - 3B - 1/4 x 28
| Thread Form | UNF (STI) |
| Size | 1/4 |
| Pitch | 28 |
| Gauge Type | Plug Gauge (D/E) |
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Description
The VCOIL Plug Gauge (D/E) UNF (STI) is a precision Helicoil thread plug gauge designed for right-hand UNF threads, enabling quick go/no-go verification of 1/4 x 28 size in strict ANSI standards environments.
- Thread Type: UNF (STI) – conforms to the Unified National Fine thread system used in Helicoil gauges.
- Size: 1/4 x 28
- Gauge Type: Go/No-Go thread plug gauge (combined inspection tool for acceptance and rejection checks)
- Handedness: Right Hand orientation
- Grade/Tolerance: 3B class for consistent dimensional control
- Scrap-Side Marking: Red ring indicates the scrap side for rapid identification
- Standard Compliance: Manufactured and assessed to ANSI/ASME thread standards
- Reference Temperature: 20°C for parts and gauges to ensure measurement accuracy
- Construction Details: Knurled grip and robust ends facilitate secure handling and precise insertion into threads
By delivering a clear go/no-go verdict, this gauge helps ensure threads meet specification before assembly, reducing scrap and rework. The go end confirms easy hand-tun compatibility with the cut thread, while the no-go end prevents over-screwing beyond the acceptable limit of manual turns. The red scrap-ring marking streamlines inspection workflows, and the 20°C reference environment supports consistent, repeatable checks in production or quality control labs.
Part Numbers
- Protool Part Number
- TC-19927
- 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 UNF (STI)
View full collection →You are viewing TC-19927. Click any other SKU to view its full details.
| Product SKU | Size | Pitch | Price | Stock | Order |
|---|---|---|---|---|---|
| TC-19823 | No. 4 | 48 | £102.03 | In Stock | |
| TC-19824 | No. 6 | 40 | £102.03 | In Stock | |
| TC-19825 | No. 8 | 36 | £98.05 | In Stock | |
| TC-19826 | No. 10 | 32 | £98.05 | 7 days | |
| TC-19827 | 1/4 | 28 | £95.40 | 7 days | |
| TC-19828 | 5/16 | 24 | £99.38 | 7 days | |
| TC-19829 | 3/8 | 24 | £103.35 | 7 days | |
| TC-19830 | 7/16 | 20 | £108.65 | In Stock | |
| TC-19831 | 1/2 | 20 | £113.95 | 7 days | |
| TC-19832 | 9/16 | 18 | £123.23 | In Stock | |
| TC-19833 | 5/8 | 18 | £137.80 | In Stock | |
| TC-19834 | 3/4 | 16 | £169.60 | 7 days | |
| TC-19835 | 7/8 | 14 | £184.18 | 7 days | |
| TC-19836 | 1 | 12 | £221.28 | 7 days | |
| TC-19837 | 1 | 14 | £221.28 | 7 days | |
| TC-19838 | 1.1/8 | 12 | £221.28 | 7 days | |
| TC-19839 | 1.1/4 | 12 | £257.05 | 7 days | |
| TC-19840 | 1.3/8 | 12 | £166.95 | 7 days | |
| TC-19841 | 1.3/8 | 12 | £166.95 | 7 days | |
| TC-19842 | 1.1/2 | 12 | £194.78 | 7 days | |
| TC-19843 | 1.1/2 | 12 | £194.78 | 7 days | |
| TC-19923 | No. 4 | 48 | £121.90 | 7 days | |
| TC-19924 | No. 6 | 40 | £121.90 | 7 days | |
| TC-19925 | No. 8 | 36 | £116.60 | 7 days | |
| TC-19926 | No. 10 | 32 | £116.60 | 7 days | |
| TC-19927 Viewing | 1/4 | 28 | £115.28 | 7 days | |
| TC-19928 | 5/16 | 24 | £119.25 | 7 days | |
| TC-19929 | 3/8 | 24 | £123.23 | 7 days | |
| TC-19930 | 7/16 | 20 | £129.85 | 7 days | |
| TC-19931 | 1/2 | 20 | £136.48 | 7 days | |
| TC-19932 | 9/16 | 18 | £148.40 | 7 days | |
| TC-19933 | 5/8 | 18 | £165.63 | 7 days | |
| TC-19934 | 3/4 | 16 | £202.73 | 7 days | |
| TC-19935 | 7/8 | 14 | £221.28 | 7 days | |
| TC-19936 | 1 | 12 | £265.00 | 7 days | |
| TC-19937 | 1 | 14 | £265.00 | 7 days | |
| TC-19938 | 1.1/8 | 12 | £265.00 | 7 days | |
| TC-19939 | 1.1/4 | 12 | £308.73 | 7 days | |
| TC-19940 | 1.3/8 | 12 | £201.40 | 7 days | |
| TC-19941 | 1.3/8 | 12 | £201.40 | 7 days | |
| TC-19942 | 1.1/2 | 12 | £234.53 | 7 days | |
| TC-19943 | 1.1/2 | 12 | £234.53 | 7 days |
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