{"product_id":"5770-3-4-close-fit","title":"Robert Charles Plain Shank Counterbore M35-HSS-E 5% Cobalt - 3\/4 Cap Screw Size - 0.766 Pilot Size","description":"\u003cdiv\u003e\n\u003cp\u003e\nThe Robert Charles Plain Shank Counterbore is a precision cutting tool designed for engineers, machinists, and workshops that demand clean, accurate counterbores and dependable performance. Crafted from M35-HSS-E with 5% cobalt, it combines heat resistance with durable wear life, while the plain shank ensures straightforward mounting in standard tool holders.\n\u003c\/p\u003e \u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eMaterial and Grade\u003c\/b\u003e: M35-HSS-E with 5% cobalt for enhanced heat resistance and extended wear life in demanding cutting conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eShank Type\u003c\/b\u003e: Plain shank design for easy fitment into standard tool holders and stable, reliable machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCounterbore Size and Pilot\u003c\/b\u003e: Engineered for a 3\/4 cap screw size with a 0.766 inch pilot to ensure precise alignment through the workpiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCutting Geometry\u003c\/b\u003e: Optimized edge and flute geometry to produce clean, flat-bottom counterbores with smooth chip evacuation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePrecision and Tolerances\u003c\/b\u003e: Manufactured to tight tolerances to deliver repeatable depths and consistent results across jobs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eApplication Fit\u003c\/b\u003e: Ideal for precision engineering, automotive assemblies, and general workshop machining where durable, repeatable counterboring is essential.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\nThis counterbore helps you achieve flush-cap screw seating with minimal burrs, boosting joint strength and finish quality. The cobalt-enhanced alloy maintains hardness under higher cutting speeds, reducing tool wear and downtime. With its straightforward plain-shank design, it integrates seamlessly into existing setups, while the 0.766 inch pilot ensures accurate guidance through the workpiece for reliable, repeatable performance.\n\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Robert Charles","offers":[{"title":"Default Title","offer_id":43411729154126,"sku":"5770-3\/4-CLOSE FIT","price":211.72,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0560\/3747\/4382\/files\/Robert_Charles_Counterbores_90d41a20-7616-4e5a-874b-3ae26dbedce7.png?v=1769685388","url":"https:\/\/www.protool-ltd.co.uk\/products\/5770-3-4-close-fit","provider":"Protool Precision Tools","version":"1.0","type":"link"}