Please log in here to access all benefits, including promotional discounts and faster checkouts.
Robert Charles Piloted Microstop Countersink - 3 Flute - Integral Pilot - Threaded Shank - 1/4 Pilot Diameter - 100°
| Pilot Diameter | 1/4 |
| Cutter Diameter | 1/2 |
| Inclusive Angle | 100 |
| Thread | 1/4-28 |
| Decimal Equivalent | . 2500 |
Learn more about Klarna
The Robert Charles Piloted Microstop Countersink is a precision 3‑flute cutter with an integral pilot that guides every hole for accurate alignment and consistent countersinking. It’s tailored for aerospace, automotive, and precision engineering applications where every countersunk surface matters.
With a threaded shank for a secure, slip‑free fit and reliable depth control, this countersink pairs with microstop cages to reproduce the same depth across multiple holes. The pilot diameter is tightly controlled at −0.0005" to −0.0015", ensuring repeatable, high‑accuracy results even on challenging materials.
- Integral Pilot for Accurate Alignment: Keeps the countersink centered for consistent seating and reduced rework.
- 3‑Flute Design for Clean Countersinking: Delivers smooth finishes and balanced chip evacuation for repeatable results.
- Threaded Shank with Secure Fitment and Depth Control: Provides a stable, repeatable depth when used with microstop cages, enhancing workflow reliability.
This tool enables faster setup, tighter tolerances, and dependable performance in critical assemblies. By combining a precise pilot with secure threading and compatible depth control, it supports high‑quality countersinking where consistency and precision are non‑negotiable.
| Pilot Diameter | 1/4 |
| Cutter Diameter | 1/2 |
| Inclusive Angle | 100 |
| Thread | 1/4-28 |
| Decimal Equivalent | . 2500 |
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 Countersinks - 3 Flute - Integral Pilot - Threaded Shank
View full collection →You are viewing SUNF1/4-100-1/2. Click any other SKU to view its full details.
| Product SKU | Pilot Diameter | Cutter Diameter | Inclusive Angle | Thread | Decimal Equivalent | Price | Stock | Order |
|---|---|---|---|---|---|---|---|---|
| SUNF3/32-100-1/2 | 3/32 | 1/2 | 100 | 1/4-28 | . 0938 | £33.18 | 2-3 days | |
| SUNF1/8-100-1/2 | 1/8 | 1/2 | 100 | 1/4-28 | . 1250 | £33.18 | 2-3 days | |
| SUNF5/32-100-1/2 | 5/32 | 1/2 | 100 | 1/4-28 | . 1563 | £33.18 | 2-3 days | |
| SUNF3/16-100-1/2 | 3/16 | 1/2 | 100 | 1/4-28 | . 1875 | £33.18 | 2-3 days | |
| SUNF7/32-100-1/2 | 7/32 | 1/2 | 100 | 1/4-28 | . 2188 | £33.18 | 2-3 days | |
| SUNF1/4-100-1/2 Viewing | 1/4 | 1/2 | 100 | 1/4-28 | . 2500 | £33.18 | 2-3 days |
No products match your filters.
