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Robert Charles Single Flute Countersink 90° - M35-HSS-E 5% Cobalt - Metric - 4.0mm Head Dia
| Head Diameter | 4.0 |
| Shank Diameter | 4 |
| Overall Length | 44 |
| Shank Length | 36.0 |
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Description
Robert Charles Single Flute Countersink 90° – M35 HSS-E 5% Cobalt – Metric is a precision tool designed for countersinking, chamfering, and deburring metric holes with clean, uniform finishes. Made from premium M35 cobalt steel, it delivers excellent heat resistance and longer tool life, making it well-suited for tough materials such as stainless steel, alloy steels, and non‑ferrous metals.
- Premium M35 HSS-E with 5% cobalt: Higher hardness and heat resistance translate to longer life and sustained sharpness when working hard metals, reducing replacements and downtime.
- 90° single-flute geometry for precise chamfers: Provides clean, burr-free finishes with consistent chamfer depth, improving hole quality and reducing post‑processing steps.
- 4.0 mm metric head diameter: Tailored for standard metric holes, enabling reliable alignment and repeatable results across multiple countersinks.
ThisCountersink delivers dependable performance in everyday shop workflows by combining durable materials, a geometry optimized for precision, and a metric-focused size that supports consistent, high-quality finishes. Whether in a production environment or a hobbyist workstation, you can count on repeatable results, reduced rework, and faster setup times to keep your projects moving smoothly.
Part Numbers
- Protool Part Number
- 5890-4.0-90
- Brand
- Robert Charles
- Category
- Countersinks
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: Robert Charles Single Flute Countersink 90° - M35-HSS-E 5% Cobalt - Metric
View full collection →You are viewing 5890-4.0-90. Click any other SKU to view its full details.
| Product SKU | Head Diameter | Shank Diameter | Overall Length | Shank Length | Inclusive Angle | Price | Stock | Order |
|---|---|---|---|---|---|---|---|---|
| 5890-4.0-90 Viewing | 4.0 | 4 | 44 | 36.0 | 90 | £26.07 | 2-3 days | |
| 5890-6.0-90 | 6.0 | 5 | 45 | 36.0 | 90 | £26.07 | 2-3 days | |
| 5890-8.0-90 | 8.0 | 6 | 45 | 32.0 | 90 | £26.86 | 2-3 days | |
| 5890-10.0-90 | 10. | 6 | 45 | 32.0 | 90 | £27.65 | 2-3 days | |
| 5890-12.5-90 | 12.5 | 8 | 48 | 32.0 | 90 | £32.39 | 2-3 days | |
| 5890-14.0-90 | 14.0 | 8 | 48 | 30.5 | 90 | £36.34 | 2-3 days | |
| 5890-16.0-90 | 16.0 | 10 | 56 | 36.0 | 90 | £41.08 | 2-3 days | |
| 5890-21.0-90 | 21.0 | 10 | 65 | 37.5 | 90 | £53.72 | 2-3 days | |
| 5890-25.0-90 | 25.0 | 10 | 65 | 36.0 | 90 | £72.68 | 2-3 days | |
| 5890-28.0-90 | 28 | 12 | 85 | 48 | 90 | £126.40 | 2-3 days | |
| 5890-35.0-90 | 35 | 15 | 102 | 56.5 | 90 | £213.30 | 2-3 days |
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