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Omega Products Castleated Spanner/Wrench - For ER Collet Chucks with Castle (UM) Nut - ER20
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Description
Omega Products Castleated Spanners/Wrenches are purpose-built tools designed to tighten ER collet chucks with castle (UM) nuts. Specifically engineered for ER20 systems, these wrenches provide precise, secure engagement that reduces slip and ensures reliable clamping.
Ideal for machinists, technicians, and hobbyists who work with ER collets, these spanners offer a fast, repeatable setup and a confident fit every time.
- Castle-Engaged Fit for Secure Tightening: The castleated profile matches the UM castle nut on ER20 collet chucks, delivering precise engagement and minimizing slip for consistent clamping.
- Ergonomic, High-Visibility Handles: Bright red handles provide a comfortable grip and quick identification in busy workshops, helping reduce hand fatigue during repetitive tightening tasks.
- Designed for ER20 Collets: Engineered to fit ER20 chucks with UM nuts, providing a reliable, repeatable setup that speeds installation and minimizes adjustments.
Together, these features translate to faster setup times, fewer reworks, and more dependable tool changes in everyday machining workflows. The result is smoother operation, reduced downtime, and consistent results across tasks requiring ER20 collet chucks with castle nuts.
Part Numbers
- Protool Part Number
- OM31406
- Brand
- Omega
- Category
- Wrench
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: Omega Products Castleated Spanners/Wrenches - For ER Collet Chucks with Castle (UM) Nut
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