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Robert Charles Piloted Microstop Countersink - Removable Pilot - Threaded Shank - 3/8 Pilot Dia - 5mm Pilot Shank Dia - 100°
| Pilot Diameter | 3/8 |
| Pilot Shank Diameter | 5 |
| Inclusive Angle | 100 |
| Cutter Diameter | 21.00 |
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Description
The Robert Charles Piloted Microstop Countersink – Removable Pilot – Threaded Shank is a precision countersinking tool built for highly accurate depth control and repeatable results. It features a removable pilot for quick size changes without swapping the entire tool, and a secure threaded shank that fits into compatible microstop cages for stable, reliable performance. With a 3/8 in pilot diameter and a 5 mm pilot shank diameter, plus a 100° countersink angle, it delivers clean, uniform finishes across a variety of materials—ideal for aerospace, engineering, and precision assembly applications.
- Removable Pilot for Quick Size Changes: Switch between hole sizes without removing the tool, preserving alignment and reducing changeover time in high-mix workflows.
- Secure Threaded Shank for Stable Use: Threads into compatible microstop cages for a dependable fit, minimizing runout and vibration for repeatable results.
- 100° Countersink for Clean, Repeatable Finishes: Delivers smooth, flush countersinks across different materials with consistent depth control and surface quality.
Using this piloted countersink helps you achieve predictable, high-quality finishes with less rework and downtime. The removable pilot and threaded shank streamline setup in busy shops, while the precise 100° angle and robust construction deliver reliable performance across aerospace, engineering, and precision-assembly tasks. Built for durability, it maintains consistent results project after project, helping you complete jobs faster with confidence.
Part Numbers
- Protool Part Number
- D9.52-100-21
- 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
View full collection →You are viewing D9.52-100-21. Click any other SKU to view its full details.
| 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 | 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 Viewing | 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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