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JBO Thread Ring Gauge (NoGo) - Trapezoidal - Right Hand - 7e - Tr. 18 x 4
| Thread Form | Trapez |
| Size | Tr. 18 |
| Pitch | 4 |
| Gauge Type | Ring Gauge (NoGo) |
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Description
The JBO Thread Ring Gauge (NoGo) – Trapezoidal, Right Hand, 7e, Tr. 18 x 4 is a precision tool designed to verify external threads on fasteners, fittings, and machined components. Built for manufacturing environments, automotive suppliers, and aerospace QA teams, it helps ensure thread diameters conform to accepted standards and fit expectations.
The NoGo design enables quick, at-a-glance identification of non-conforming threads, supporting reliable assemblies and reducing the risk of fitment issues in critical applications. Crafted from hardened steel, this gauge is ready for everyday use in demanding inspection routines.
- NoGo design for fast non-conformity checks: quickly determine if threads exceed tolerance, speeding up inspections and reducing rework.
- Hardened steel construction: rugged durability that stands up to frequent handling and long service life in busy shop environments.
- Precise trapezoidal right-hand configuration (7e, Tr. 18 x 4): ensures consistent, repeatable measurements aligned with Unified thread standards.
Using this gauge integrates smoothly into quality-control workflows, helping inspectors verify external threads with confidence, streamline dimetric checks, and achieve reliable results across manufacturing, automotive, and aerospace applications.
Part Numbers
- Protool Part Number
- JBO-501187
- 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 Thread Ring Gauges (NoGo) - Trapezoidal
View full collection →You are viewing JBO-501187. Click any other SKU to view its full details.
| Product SKU | Size | Pitch | Price | Stock | Order |
|---|---|---|---|---|---|
| JBO-501198 | Tr. 8 | 1.5 | £274.12 | 5 days | |
| JBO-501177 | Tr. 10 | 2 | £279.61 | 5 days | |
| JBO-501179 | Tr. 11 | 2 | £284.00 | 5 days | |
| JBO-503037 | Tr. 12 | 3 | £287.29 | 5 days | |
| JBO-503435 | Tr. 14 | 3 | £290.57 | 5 days | |
| JBO-501185 | Tr. 16 | 4 | £301.53 | 5 days | |
| JBO-501187 Viewing | Tr. 18 | 4 | £305.94 | 5 days | |
| JBO-501188 | Tr. 20 | 4 | £316.90 | 5 days | |
| JBO-501189 | Tr. 22 | 5 | £333.35 | 5 days | |
| JBO-501191 | Tr. 24 | 5 | £349.78 | 5 days | |
| JBO-501193 | Tr. 26 | 5 | £362.95 | 5 days | |
| JBO-503466 | Tr. 28 | 5 | £379.41 | 5 days | |
| JBO-502742 | Tr. 30 | 6 | £394.75 | 5 days | |
| JBO-502826 | Tr. 32 | 6 | £406.82 | 5 days |
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