{"product_id":"5855-3-16-90","title":"Robet Charles Imperial Piloted Countersink - 3 Flutes Integral Pilot Straight Shank - 3\/16 Pilot Diameter - 90° Inclusive Angle","description":"\u003cdiv\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e \u003cp\u003eDesigned 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.\u003c\/p\u003e \u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eIntegral Pilot for Accurate Hole Alignment\u003c\/b\u003e: The built-in pilot guides the countersink for concentric chamfers and reduced deviation, improving hole quality and fit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e3-Flute, 90° Countersink Geometry\u003c\/b\u003e: The 3-flute design, paired with a 90° inclusive angle, delivers a clean, controlled chamfer and efficient material removal with minimal chatter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTight Pilot Diameter Tolerance\u003c\/b\u003e: Pilot diameter is held at -0.0005\" to -0.0015\", delivering repeatable, concentric results across production runs and materials.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eThis 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.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Robert Charles","offers":[{"title":"Default Title","offer_id":43418537197646,"sku":"5855-3\/16-90","price":32.39,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0560\/3747\/4382\/files\/Robert_Charles_Piloted_Countersink_700737e4-bc00-4cd6-be2e-a72a0bbd0c57.png?v=1770027923","url":"https:\/\/www.protool-ltd.co.uk\/products\/5855-3-16-90","provider":"Protool Precision Tools","version":"1.0","type":"link"}