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Robert Charles Piloted Microstop Countersink - 3 Flute - Integral Pilot - Threaded Shank - 3/16 Pilot Diameter - 100°
| Pilot Diameter | 3/16 |
| Cutter Diameter | 1/2 |
| Inclusive Angle | 100 |
| Thread | 1/4-28 |
| Decimal Equivalent | . 1875 |
Learn more about Klarna
The Robert Charles Piloted Microstop Countersink is a precision cutting tool designed for engineers, machinists, and technicians who need accurate countersinking with a built-in pilot. Its 3‑flute design delivers clean, repeatable countersinks and consistent hole alignment, helping you achieve high‑quality finishes with fewer passes.
Featuring a threaded shank for secure fitment and compatibility with microstop cages, this countersink provides reliable depth control in demanding applications. It uses a 3/16 inch pilot diameter and a 100° countersink angle, with the pilot diameter held to tight tolerances of −0.0005" to −0.0015", making it ideal for aerospace, automotive, and precision engineering work.
- 3-Flute Cutting Design with 100° Countersink: Delivers clean, consistent countersinks with smooth margins and reliable edge finishes, improving surface quality and repeatability across materials.
- Integral 3/16 inch Pilot Diameter with Tight Tolerances: Built-in pilot centers the countersink on the hole, delivering precise alignment; the pilot diameter is held to −0.0005" to −0.0015" for repeatable results.
- Threaded Shank for Secure Fitment and Microstop Cage Compatibility: Provides a secure mount in tools and, when paired with microstop cages, enables reliable depth control and repeatable countersink depths.
This countersink supports accurate hole preparation, reduces rework, and enhances consistency across assemblies. Its robust construction and precise tolerances give you confidence in high‑stakes aerospace, automotive, and precision‑engineering projects.
| Pilot Diameter | 3/16 |
| Cutter Diameter | 1/2 |
| Inclusive Angle | 100 |
| Thread | 1/4-28 |
| Decimal Equivalent | . 1875 |
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 SUNF3/16-100-1/2. 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 Viewing | 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 | 1/4 | 1/2 | 100 | 1/4-28 | . 2500 | £33.18 | 2-3 days |
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