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JBO Thread Ring Gauge (NoGo) - Metric Coarse - Left Hand - 6g - M18 x 2.5
| Thread Form | Metric |
| Size | M18 |
| Pitch | 2.5 |
| Gauge Type | Ring Gauge (NoGo) |
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Description
The JBO Thread Ring Gauge (NoGo) is a precision tool for checking external metric coarse threads. Specifically designed for left-hand threads (M18 x 2.5) with a 6g tolerance, it helps production teams, quality inspectors, and machinists quickly verify that parts meet the required dimensions. This NoGo gauge supports efficient go/no-go testing to confirm correct fit and interchanges.
Constructed from hardened steel, it delivers long-lasting durability in demanding shop environments, resisting wear even with frequent handling and routine use. Its clear, straightforward design makes it easy to identify parts that are out of specification, reducing guesswork and rework.
- Go/No-Go quick verification: The NoGo design provides a fast pass/fail check for M18 x 2.5 LH coarse threads, helping inspectors sort compliant parts from non-conforming ones with less effort and downtime.
- Durable hardened steel construction: Built to withstand daily use in busy workshops, the gauge resists wear and maintains accuracy over time, reducing replacement and maintenance costs.
- Metric coarse, left-hand compatibility: Precisely machined for LH coarse threads, this gauge ensures reliable, standards-aligned measurements and consistent results across batches.
Using the JBO NoGo Thread Ring Gauge, you gain a reliable inspection step that minimizes errors, speeds up quality control, and improves overall fitment and performance in your manufacturing or assembly workflow.
Part Numbers
- Protool Part Number
- JBO-500373
- 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) - Metric Coarse
View full collection →You are viewing JBO-500373. Click any other SKU to view its full details.
| Product SKU | Size | Pitch | Price | Stock | Order |
|---|---|---|---|---|---|
| JBO-500131 | M1 | 0.25 | £135.97 | 5 days | |
| JBO-500135 | M1.1 | 0.25 | £176.54 | 5 days | |
| JBO-500136 | M1.2 | 0.25 | £128.29 | 5 days | |
| JBO-500139 | M1.4 | 0.3 | £114.03 | 5 days | |
| JBO-500146 | M1.6 | 0.35 | £99.02 | 5 days | |
| JBO-500151 | M1.7 | 0.35 | £120.61 | 5 days | |
| JBO-500154 | M1.8 | 0.35 | £88.27 | 5 days | |
| JBO-500404 | M2 | 0.4 | £83.67 | 5 days | |
| JBO-500419 | M2.2 | 0.45 | £93.31 | 5 days | |
| JBO-500425 | M2.3 | 0.4 | £154.62 | 5 days | |
| JBO-500429 | M2.5 | 0.45 | £67.67 | 5 days | |
| JBO-500441 | M2.6 | 0.45 | £83.11 | 5 days | |
| JBO-500596 | M3 | 0.5 | £52.09 | 5 days | |
| JBO-500611 | M3.5 | 0.6 | £54.82 | 5 days | |
| JBO-500734 | M4 | 0.7 | £47.70 | 5 days | |
| JBO-500752 | M4.5 | 0.75 | £74.13 | 5 days | |
| JBO-500822 | M5 | 0.8 | £47.70 | 5 days | |
| JBO-500896 | M6 | 1 | £47.70 | 5 days | |
| JBO-500948 | M7 | 1 | £54.51 | 5 days | |
| JBO-500980 | M8 | 1.25 | £48.81 | 5 days | |
| JBO-501024 | M9 | 1.25 | £65.13 | 5 days | |
| JBO-500158 | M10 | 1.5 | £54.51 | 5 days | |
| JBO-500201 | M11 | 1.5 | £76.53 | 5 days | |
| JBO-500218 | M12 | 1.75 | £60.74 | 5 days | |
| JBO-500277 | M14 | 2 | £64.91 | 5 days | |
| JBO-500327 | M16 | 2 | £74.24 | 5 days | |
| JBO-500370 | M18 | 2.5 | £87.84 | 5 days | |
| JBO-500447 | M20 | 2.5 | £94.96 | 5 days | |
| JBO-500479 | M22 | 2.5 | £106.80 | 5 days | |
| JBO-500508 | M24 | 3 | £111.84 | 5 days | |
| JBO-500559 | M27 | 3 | £128.29 | 5 days | |
| JBO-500623 | M30 | 3.5 | £135.97 | 5 days | |
| JBO-500664 | M33 | 3.5 | £154.62 | 5 days | |
| JBO-500696 | M36 | 4 | £163.39 | 5 days | |
| JBO-500723 | M39 | 4 | £179.84 | 5 days | |
| JBO-500775 | M42 | 4.5 | £186.41 | 5 days | |
| JBO-500791 | M45 | 4.5 | £198.46 | 5 days | |
| JBO-500807 | M48 | 5 | £209.44 | 5 days | |
| JBO-500860 | M52 | 5 | £250.01 | 5 days | |
| JBO-500877 | M56 | 5.5 | £239.05 | 5 days | |
| JBO-500923 | M60 | 5.5 | £321.28 | 5 days | |
| JBO-500935 | M64 | 6 | £339.93 | 5 days | |
| JBO-500944 | M68 | 6 | £362.95 | 5 days | |
| JBO-500148 | M1.6 | 0.35 | £117.33 | 5 days | |
| JBO-500409 | M2 | 0.4 | £95.95 | 5 days | |
| JBO-500420 | M2.2 | 0.45 | £107.24 | 5 days | |
| JBO-500432 | M2.5 | 0.45 | £76.44 | 5 days | |
| JBO-500600 | M3 | 0.5 | £58.90 | 5 days | |
| JBO-500613 | M3.5 | 0.6 | £59.98 | 5 days | |
| JBO-500736 | M4 | 0.7 | £53.62 | 5 days | |
| JBO-500826 | M5 | 0.8 | £53.62 | 5 days | |
| JBO-500900 | M6 | 1 | £53.62 | 5 days | |
| JBO-500949 | M7 | 1 | £62.72 | 5 days | |
| JBO-500984 | M8 | 1.25 | £54.94 | 5 days | |
| JBO-502957 | M9 | 1.25 | £82.24 | 5 days | |
| JBO-500162 | M10 | 1.5 | £63.50 | 5 days | |
| JBO-500202 | M11 | 1.5 | £96.40 | 5 days | |
| JBO-500221 | M12 | 1.75 | £70.29 | 5 days | |
| JBO-500279 | M14 | 2 | £77.97 | 5 days | |
| JBO-500331 | M16 | 2 | £83.67 | 5 days | |
| JBO-500371 | M18 | 2.5 | £97.16 | 5 days | |
| JBO-500452 | M20 | 2.5 | £107.15 | 5 days | |
| JBO-500480 | M22 | 2.5 | £129.40 | 5 days | |
| JBO-500511 | M24 | 3 | £137.06 | 5 days | |
| JBO-500560 | M27 | 3 | £154.62 | 5 days | |
| JBO-500625 | M30 | 3.5 | £168.86 | 5 days | |
| JBO-505324 | M33 | 3.5 | £187.50 | 5 days | |
| JBO-540008 | M36 | 4 | £199.57 | 5 days | |
| JBO-540862 | M39 | 4 | £216.02 | 5 days | |
| JBO-500149 | M1.6 | 0.35 | £124.99 | 5 days | |
| JBO-500156 | M1.8 | 0.35 | £124.99 | 5 days | |
| JBO-500410 | M2 | 0.4 | £105.26 | 5 days | |
| JBO-506051 | M2.2 | 0.45 | £117.33 | 5 days | |
| JBO-500433 | M2.5 | 0.45 | £82.80 | 5 days | |
| JBO-500602 | M3 | 0.5 | £63.83 | 5 days | |
| JBO-500614 | M3.5 | 0.6 | £66.02 | 5 days | |
| JBO-500737 | M4 | 0.7 | £58.90 | 5 days | |
| JBO-500828 | M5 | 0.8 | £58.90 | 5 days | |
| JBO-500901 | M6 | 1 | £58.90 | 5 days | |
| JBO-500950 | M7 | 1 | £68.54 | 5 days | |
| JBO-500985 | M8 | 1.25 | £60.43 | 5 days | |
| JBO-504251 | M9 | 1.25 | £82.24 | 5 days | |
| JBO-500164 | M10 | 1.5 | £69.51 | 5 days | |
| JBO-500203 | M11 | 1.5 | £96.40 | 5 days | |
| JBO-500223 | M12 | 1.75 | £77.19 | 5 days | |
| JBO-500280 | M14 | 2 | £82.45 | 5 days | |
| JBO-500333 | M16 | 2 | £91.67 | 5 days | |
| JBO-500372 | M18 | 2.5 | £106.25 | 5 days | |
| JBO-500453 | M20 | 2.5 | £117.33 | 5 days | |
| JBO-500481 | M22 | 2.5 | £129.40 | 5 days | |
| JBO-500512 | M24 | 3 | £137.06 | 5 days | |
| JBO-500561 | M27 | 3 | £154.62 | 5 days | |
| JBO-500626 | M30 | 3.5 | £168.86 | 5 days | |
| JBO-503925 | M33 | 3.5 | £183.12 | 5 days | |
| JBO-500697 | M36 | 4 | £199.57 | 5 days | |
| JBO-506052 | M39 | 4 | £216.02 | 5 days | |
| JBO-506061 | M42 | 4.5 | £285.10 | 5 days | |
| JBO-506062 | M45 | 4.5 | £301.53 | 5 days | |
| JBO-505776 | M48 | 5 | £321.28 | 5 days | |
| JBO-506063 | M52 | 5 | £343.21 | 5 days | |
| JBO-500132 | M1 | 0.25 | £509.89 | 5 days | |
| JBO-506046 | M1.1 | 0.25 | £649.14 | 5 days | |
| JBO-500137 | M1.2 | 0.25 | £467.11 | 5 days | |
| JBO-500140 | M1.4 | 0.3 | £144.74 | 5 days | |
| JBO-500147 | M1.6 | 0.35 | £124.99 | 5 days | |
| JBO-500155 | M1.8 | 0.35 | £111.84 | 5 days | |
| JBO-500407 | M2 | 0.4 | £105.26 | 5 days | |
| JBO-503923 | M2.2 | 0.45 | £117.33 | 5 days | |
| JBO-500430 | M2.5 | 0.45 | £82.80 | 5 days | |
| JBO-500598 | M3 | 0.5 | £63.83 | 5 days | |
| JBO-500612 | M3.5 | 0.6 | £66.02 | 5 days | |
| JBO-500735 | M4 | 0.7 | £58.90 | 5 days | |
| JBO-500824 | M5 | 0.8 | £58.90 | 5 days | |
| JBO-500899 | M6 | 1 | £58.90 | 5 days | |
| JBO-502914 | M7 | 1 | £68.54 | 5 days | |
| JBO-500983 | M8 | 1.25 | £60.43 | 5 days | |
| JBO-501025 | M9 | 1.25 | £82.24 | 5 days | |
| JBO-500161 | M10 | 1.5 | £69.51 | 5 days | |
| JBO-503125 | M11 | 1.5 | £96.40 | 5 days | |
| JBO-500220 | M12 | 1.75 | £77.19 | 5 days | |
| JBO-503920 | M14 | 2 | £82.45 | 5 days | |
| JBO-500330 | M16 | 2 | £91.67 | 5 days | |
| JBO-503921 | M18 | 2.5 | £106.25 | 5 days | |
| JBO-500450 | M20 | 2.5 | £117.33 | 5 days | |
| JBO-503922 | M22 | 2.5 | £131.59 | 5 days | |
| JBO-500510 | M24 | 3 | £137.06 | 5 days | |
| JBO-506047 | M27 | 3 | £144.74 | 5 days | |
| JBO-500624 | M30 | 3.5 | £172.16 | 5 days | |
| JBO-506031 | M1.4 | 0.3 | £163.39 | 5 days | |
| JBO-505436 | M1.6 | 0.35 | £141.45 | 5 days | |
| JBO-502739 | M2 | 0.4 | £127.21 | 5 days | |
| JBO-500434 | M2.5 | 0.45 | £94.73 | 5 days | |
| JBO-500604 | M3 | 0.5 | £63.83 | 5 days | |
| JBO-500615 | M3.5 | 0.6 | £66.02 | 5 days | |
| JBO-500739 | M4 | 0.7 | £58.90 | 5 days | |
| JBO-500831 | M5 | 0.8 | £58.90 | 5 days | |
| JBO-500904 | M6 | 1 | £58.90 | 5 days | |
| JBO-500951 | M7 | 1 | £68.54 | 5 days | |
| JBO-500989 | M8 | 1.25 | £60.43 | 5 days | |
| JBO-502801 | M9 | 1.25 | £82.24 | 5 days | |
| JBO-500167 | M10 | 1.5 | £69.51 | 5 days | |
| JBO-503904 | M11 | 1.5 | £96.40 | 5 days | |
| JBO-500227 | M12 | 1.75 | £77.19 | 5 days | |
| JBO-500281 | M14 | 2 | £94.09 | 5 days | |
| JBO-500334 | M16 | 2 | £91.67 | 5 days | |
| JBO-500373 Viewing | M18 | 2.5 | £106.25 | 5 days | |
| JBO-500454 | M20 | 2.5 | £117.33 | 5 days | |
| JBO-503353 | M22 | 2.5 | £129.40 | 5 days | |
| JBO-500514 | M24 | 3 | £137.06 | 5 days | |
| JBO-500562 | M27 | 3 | £154.62 | 5 days | |
| JBO-500627 | M30 | 3.5 | £168.86 | 5 days | |
| JBO-500665 | M33 | 3.5 | £183.12 | 5 days | |
| JBO-500698 | M36 | 4 | £199.57 | 5 days | |
| JBO-502988 | M39 | 4 | £230.28 | 5 days | |
| JBO-503933 | M42 | 4.5 | £250.01 | 5 days | |
| JBO-505825 | M45 | 4.5 | £264.27 | 5 days | |
| JBO-503726 | M48 | 5 | £280.72 | 5 days | |
| JBO-506064 | M52 | 5 | £301.53 | 5 days | |
| JBO-503918 | M4 | 0.7 | £69.74 | 5 days | |
| JBO-502955 | M5 | 0.8 | £69.74 | 5 days | |
| JBO-500905 | M6 | 1 | £69.74 | 5 days | |
| JBO-500990 | M8 | 1.25 | £71.39 | 5 days | |
| JBO-503094 | M10 | 1.5 | £82.35 | 5 days | |
| JBO-503760 | M12 | 1.75 | £91.57 | 5 days | |
| JBO-500335 | M16 | 2 | £108.68 | 5 days | |
| JBO-503919 | M20 | 2.5 | £137.06 | 5 days |
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