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Robet Charles Imperial Piloted Countersink - 3 Flutes Integral Pilot Straight Shank - 3/16 Pilot Diameter - 90° Inclusive Angle
| Pilot Diameter | 3/16 |
| Inclusive Angle | 90 |
| Body Diameter | 0.3601 |
| Shank Diameter | 1.3/4 |
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Description
The Robet Charles Imperial piloted countersink is a precision cutting tool designed for accurate, repeatable countersinking in CNC and manual machining. With a 3-flute cutting design and an integral pilot, it guides the chamfer for precise hole alignment and a smooth cut, reducing chatter. It’s ideal for aerospace, automotive, and general engineering work where consistent chamfer quality matters.
Designed with a built‑in 3/16" pilot diameter and a 90° inclusive angle, this countersink delivers reliable, concentric chamfers every time. The integral pilot diameter is held to -0.0005" to -0.0015", ensuring repeatable results across production runs. The straight shank fits standard milling or drilling setups, making it easy to integrate into existing workflows.
- Integral Pilot for Accurate Hole Alignment: The built-in pilot guides the countersink for concentric chamfers and reduced deviation, improving hole quality and fit.
- 3-Flute, 90° Countersink Geometry: The 3-flute design, paired with a 90° inclusive angle, delivers a clean, controlled chamfer and efficient material removal with minimal chatter.
- Tight Pilot Diameter Tolerance: Pilot diameter is held at -0.0005" to -0.0015", delivering repeatable, concentric results across production runs and materials.
This countersink supports faster setup, improved finish quality, and reduced rework by delivering consistent chamfers that align precisely with pre-drilled holes. The fixed integral pilot and tight tolerances translate to reliable performance across aerospace, automotive, and general engineering projects, making it a trusted addition to your machining toolkit.
Part Numbers
- Protool Part Number
- 5855-3/16-90
- 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.
