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JBO Thread Plug Gauge (GO) - Metric Coarse - Left Hand - 6H - M42 x 4.5
| Thread Form | Metric |
| Size | M42 |
| Pitch | 4.5 |
| Gauge Type | Plug Gauge (GO) |
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Description
The JBO Thread Plug Gauge (GO) – Metric Coarse, Left Hand, 6H, M42 x 4.5 is a precision Go gauge designed to quickly verify threaded holes meet metric coarse standards. Tailored for left-hand thread applications, it ensures holes will accept the intended components and conform to tight dimensional requirements across manufacturing, assembly, and maintenance workflows.
Ideal for quality control teams, machinists, engineers, and inspectors, this GO gauge delivers fast, repeatable pass/fail checks that reduce guesswork and rework. Crafted from hardened steel, it resists wear in demanding environments and maintains accuracy through frequent use.
- Go Gauge for Metric Coarse Threads: Provides fast, one-pass validation of hole size to metric coarse standards, enabling quick decisions and consistent assemblies.
- Durable Hardened Steel Construction: Built for daily shop use, delivering long tool life and reliable performance even in busy production environments.
- Left-Hand Thread Form Compatibility (M42 x 4.5, 6H): Precisely matched to left-hand coarse thread specifications, ensuring correct testing for the intended components and workflow.
Using the JBO GO gauge helps streamline inspection, accelerate quality checks, and improve first-pass acceptance. Its precise, repeatable measurements support reliable thread mating, reduce downtime from misfits, and provide confidence for audits and handovers across engineering and manufacturing teams.
Part Numbers
- Protool Part Number
- JBO-514598
- 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 Plug Gauges (GO) - Metric Coarse
View full collection →You are viewing JBO-514598. Click any other SKU to view its full details.
| Product SKU | Size | Pitch | Price | Stock | Order |
|---|---|---|---|---|---|
| JBO-511110 | M42 | 4.5 | £111.84 | 5 days | |
| JBO-511122 | M45 | 4.5 | £119.52 | 5 days | |
| JBO-511136 | M48 | 5 | £128.29 | 5 days | |
| JBO-511174 | M52 | 5 | £137.06 | 5 days | |
| JBO-511187 | M56 | 5.5 | £153.51 | 5 days | |
| JBO-511211 | M60 | 5.5 | £171.05 | 5 days | |
| JBO-511218 | M64 | 6 | £187.50 | 5 days | |
| JBO-513504 | M68 | 6 | £200.65 | 5 days | |
| JBO-514598 Viewing | M42 | 4.5 | £141.45 | 5 days | |
| JBO-513679 | M45 | 4.5 | £151.32 | 5 days | |
| JBO-511137 | M48 | 5 | £162.28 | 5 days | |
| JBO-514599 | M52 | 5 | £173.24 | 5 days |
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