{"product_id":"5770-7-8-close-fit","title":"Robert Charles Plain Shank Counterbore M35-HSS-E 5% Cobalt - 7\/8 Cap Screw Size - 0.891 Pilot Size","description":"\u003cdiv\u003e\n\u003cp\u003e\nThe Robert Charles Plain Shank Counterbore is a high-performance tool engineered for precise, repeatable counterboring in metalworking. Designed for machinists, engineers, and workshop professionals, it pairs durability with straightforward integration into standard tool holders.\n\u003c\/p\u003e \u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eMaterial\u003c\/b\u003e: M35-HSS-E with 5% cobalt for improved heat resistance, wear life, and cutting performance at higher speeds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eShank Type\u003c\/b\u003e: Plain shank for easy clamping in conventional tool holders, delivering stable and reliable machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCounterbore Size\u003c\/b\u003e: 7\/8 inch counterbore diameter compatible with standard cap screws and flush seating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePilot Size\u003c\/b\u003e: 0.891 inch pilot provides precise start and accurate hole centering for clean counterbores.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eGeometry\u003c\/b\u003e: Optimized flute design and relief to promote efficient chip evacuation and minimal chatter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eApplications\u003c\/b\u003e: Ideal for precision engineering, automotive assembly, and general workshop tasks requiring durable, consistent counterboring results.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\nThis counterbore delivers consistent, repeatable results across workpieces, helping you achieve flush-cap screw seating with minimal rework. The cobalt-enhanced HSS composition maintains cutting efficiency during extended machining cycles, while the plain shank simplifies setup and reduces tool-change time. Built for reliability in demanding environments, it’s a practical choice for shops that value accuracy, durability, and steady performance.\n\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Robert Charles","offers":[{"title":"Default Title","offer_id":43411729317966,"sku":"5770-7\/8-CLOSE FIT","price":255.96,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0560\/3747\/4382\/files\/Robert_Charles_Counterbores_9b873e88-354e-4aa7-802e-be686603ffef.png?v=1769685397","url":"https:\/\/www.protool-ltd.co.uk\/products\/5770-7-8-close-fit","provider":"Protool Precision Tools","version":"1.0","type":"link"}