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Robert Charles Piloted Microstop Countersink - Removable Pilot - Threaded Shank - 3/8 Pilot Dia - 5mm Pilot Shank Dia - 90°
| Pilot Diameter | 3/8 |
| Pilot Shank Diameter | 5 |
| Inclusive Angle | 90 |
| Cutter Diameter | 21.00 |
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Description
The Robert Charles Piloted Microstop Countersink with Removable Pilot and Threaded Shank is a precision cutting tool designed for highly accurate countersinking where depth control and repeatability matter. Designed for aerospace, engineering, and precision assembly, its removable pilot lets you swap sizes quickly while maintaining alignment, and the threaded shank provides a secure, reliable fit into compatible microstop cages for dependable operation at a 90° countersink angle with a 3/8 in pilot diameter and a 5 mm pilot shank diameter.
- Removable Pilot for Flexible Hole Sizing: Easily swap pilots to fit different hole sizes and keep depth control consistent across jobs.
- Secure Threaded Shank for Reliable Fit: Threads lock the tool into microstop cages, reducing slippage and preserving depth accuracy during cutting.
- 90° Countersink with Durable Construction: Precise 90° angle delivers clean, uniform countersinks across a variety of materials with long-lasting performance.
With its combination of quick pilot changes, secured mounting, and precise depth control, this countersink helps you streamline workflows, reduce rework, and achieve repeatable, professional finishes in aerospace, engineering, and precision assembly tasks. The tool’s reliability and depth consistency support faster setups and higher confidence in results across a variety of materials.
Part Numbers
- Protool Part Number
- D9.52-90-21
- 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 Piloted Microstop Countersink - Removable Pilot - Threaded Shank
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| Product SKU | Pilot Diameter | Pilot Shank Diameter | Inclusive Angle | Cutter Diameter | Number of Flutes | Thread | Price | Stock | Order |
|---|---|---|---|---|---|---|---|---|---|
| D2.38-90-10 | 3/32 | 2.3 | 90 | 10.00 | 2 | M6X1 | £47.40 | 2-3 days | |
| D3.17-90-10 | 1/8 | 2.5 | 90 | 10.00 | 2 | M6X1 | £47.40 | 2-3 days | |
| D3.96-90-10 | 5/32 | 3.5 | 90 | 10.00 | 2 | M6X1 | £47.40 | 2-3 days | |
| D4.76-90-10 | 3/16 | 3.5 | 90 | 10.00 | 2 | M6X1 | £47.40 | 2-3 days | |
| D4.76-90-14 | 3/16 | 4 | 90 | 14.00 | 2 | M8X1 | £59.25 | 2-3 days | |
| D6.35-90-14 | 1/4 | 4 | 90 | 14.00 | 2 | M8X1 | £59.25 | 2-3 days | |
| D7.94-90-17 | 5/16 | 5 | 90 | 17.00 | 3 | M8X1 | £74.26 | 2-3 days | |
| D9.52-90-21 Viewing | 3/8 | 5 | 90 | 21.00 | 3 | M8X1 | £79.00 | 2-3 days | |
| D2.38-100-10 | 3/32 | 2 | 100 | 10.00 | 2 | M6X1 | £39.50 | 2-3 days | |
| D3.17-100-10 | 1/8 | 2.5 | 100 | 10.00 | 2 | M6X1 | £39.50 | 2-3 days | |
| D3.96-100-10 | 5/32 | 3.5 | 100 | 10.00 | 2 | M6X1 | £39.50 | 2-3 days | |
| D4.76-100-10 | 3/16 | 3.5 | 100 | 10.00 | 2 | M6X1 | £39.50 | 2-3 days | |
| D4.76-100-14 | 3/16 | 4 | 100 | 14.00 | 2 | M8X1 | £50.56 | 2-3 days | |
| D6.35-100-14 | 1/4 | 4 | 100 | 14.00 | 2 | M8X1 | £50.56 | 2-3 days | |
| D7.94-100-17 | 5/16 | 5 | 100 | 17.00 | 3 | M8X1 | £66.36 | 2-3 days | |
| D9.52-100-21 | 3/8 | 5 | 100 | 21.00 | 3 | M8X1 | £72.68 | 2-3 days | |
| D2.38-120-10 | 3/32 | 2 | 120 | 10.00 | 2 | M6X1 | £47.40 | 2-3 days | |
| D3.17-120-10 | 1/8 | 2.5 | 120 | 10.00 | 2 | M6X1 | £47.40 | 2-3 days | |
| D3.96-120-10 | 5/32 | 3.5 | 120 | 10.00 | 2 | M6X1 | £47.40 | 2-3 days | |
| D4.76-120-10 | 3/16 | 3.5 | 120 | 10.00 | 2 | M6X1 | £47.40 | 2-3 days | |
| D4.76-120-14 | 3/16 | 4 | 120 | 14.00 | 2 | M8X1 | £58.46 | 2-3 days | |
| D6.35-120-14 | 1/4 | 4 | 120 | 14.00 | 2 | M8X1 | £58.46 | 2-3 days | |
| D7.94-120-17 | 5/16 | 5 | 120 | 17.00 | 3 | M8X1 | £74.26 | 2-3 days | |
| D9.52-120-21 | 3/8 | 5 | 120 | 21.00 | 3 | M8X1 | £79.00 | 2-3 days |
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