{"title":"Robert Charles Plain Shank Counterbores Standard Metric","description":"\u003cp\u003eThe Robert Charles Plain Shank Counterbore – Standard Metric is designed for accurate and reliable counterboring in precision machining applications. Featuring a plain shank for compatibility with standard tool holders, it delivers stable cutting performance and clean, consistent results. Ideal for metric hole standards, this counterbore is well suited to general engineering, automotive, and workshop use where precision and repeatability are required.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0560\/3747\/4382\/files\/Robert_Charles_Logo.png?v=1769724721\" alt=\"Robert Charles Logo\" width=\"155\" height=\"51\"\u003e\u003c\/p\u003e","products":[{"product_id":"5760-m3","title":"Robert Charles Plain Shank Counterbore Standard Metric - M3","description":"\u003cdiv\u003e\n\u003cp\u003eThe Robert Charles Plain Shank Counterbore – Standard Metric (M3) is a precision counterboring tool built for engineers, machinists, and workshop setups that demand clean, repeatable holes and reliable bolt seating. Designed for metric hole standards, it delivers dependable performance across general machining, automotive work, and fabrication tasks.\u003c\/p\u003e \u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eSize\u003c\/b\u003e: Metric M3 counterbore compatible with standard metric hole dimensions for accurate depth and fit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePlain Shank\u003c\/b\u003e: Cylindrical, plain shank for straightforward mounting in common tool holders.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCutting Quality\u003c\/b\u003e: Engineered to provide stable cutting action and clean bottom surfaces for consistent results.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eFinish and Build\u003c\/b\u003e: Polished exterior conveys durability and ease of handling in busy workshops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eVersatility\u003c\/b\u003e: Suitable for a range of applications from general engineering to automotive maintenance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePrecision Alignment\u003c\/b\u003e: Designed to maintain concentricity and repeatable performance across multiple parts.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eThis counterbore helps you achieve precise bolt seating with minimal setup time, delivering flush, level surfaces that improve assembly quality and part alignment. Ideal for projects that require tight tolerances and dependable repeatability, it’s a practical choice for production runs, prototyping, and routine repairs in mechanical workshops.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Robert Charles","offers":[{"title":"Default Title","offer_id":43411725975630,"sku":"5760-M3","price":40.29,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0560\/3747\/4382\/files\/Robert_Charles_Counterbores_9864ee0d-e581-43d3-aa6d-bb472ca16e50.png?v=1769685195"},{"product_id":"5760-m3-5","title":"Robert Charles Plain Shank Counterbore Standard Metric - M3.5","description":"\u003cdiv\u003e\n\u003cp\u003e\nRobert Charles Plain Shank Counterbore – Standard Metric (M3.5) is a precise countersinking tool built for machinists who require reliable, metric-sized hole preparation. Designed for compatibility with standard tool holders, it delivers stable cutting performance and clean, repeatable results across metalworking projects.\n\u003c\/p\u003e \u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eSize \u0026amp; Standard\u003c\/b\u003e: Metric M3.5 counterbore designed to match standard metric hole requirements for predictable drilling and finishing outcomes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eShank Type\u003c\/b\u003e: Plain shank for straightforward mounting in common tool holders and collets, enabling quick setup and solid retention during cutting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCutting Geometry\u003c\/b\u003e: Precision-ground edges ensure clean, flat-bottom counterbores with minimal burr and consistent depth control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCompatibility\u003c\/b\u003e: Suited for metric hole standards and versatile across milling machines, drill presses, and CNC setups in general engineering, automotive, and workshop environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eDurability \u0026amp; Finish\u003c\/b\u003e: Robust construction with a smooth finish designed for repeatable performance in demanding shop conditions.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\nThis counterbore helps you achieve accurate seating surfaces for metric fasteners and prepares holes with reliable depth and edge quality. The plain shank stabilizes the cut, reduces runout, and supports clean chip evacuation, contributing to faster setups, fewer reworks, and consistent results across projects. Ideal for engineers, technicians, and hobbyists who value precision, repeatability, and straightforward tool compatibility.\n\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Robert Charles","offers":[{"title":"Default Title","offer_id":43411726172238,"sku":"5760-M3.5","price":40.29,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0560\/3747\/4382\/files\/Robert_Charles_Counterbores_aa019561-7448-47c9-bfbc-7dbd87fd0194.png?v=1769685200"},{"product_id":"5760-m4","title":"Robert Charles Plain Shank Counterbore Standard Metric - M4","description":"\u003cdiv\u003e\n\u003cp\u003eThe Robert Charles Plain Shank Counterbore – Standard Metric (M4) is a precision cutting tool designed for accurate counterboring in metalworking and manufacturing. It features a plain shank for compatibility with standard tool holders, delivering reliable, repeatable results in metric hole applications.\u003c\/p\u003e \u003cul\u003e\n\u003cli\u003e\n\u003cb\u003ePlain shank design\u003c\/b\u003e: Compatible with standard tool holders for quick setup and stable alignment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMetric size\u003c\/b\u003e: Standard metric M4 configuration tailored to metric hole standards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eClean, precise counterboring\u003c\/b\u003e: Geometry engineered to produce flat-bottom holes with smooth walls for accurate fastener seating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eReliable performance\u003c\/b\u003e: Built for repeatability in demanding workshop environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eVersatile applications\u003c\/b\u003e: Suitable for general engineering, automotive, and workshop tasks requiring precision and consistency.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eUsing this counterbore helps achieve well-defined counterbored features that improve nut and bolt seating, torque transfer, and joint integrity. The plain shank simplifies tooling setup and reduces runout, contributing to tighter tolerances and more consistent results across multiple parts. Ideal for technicians and hobbyists who value reliability and accuracy in metric hole standards.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Robert Charles","offers":[{"title":"Default Title","offer_id":43411726205006,"sku":"5760-M4","price":42.66,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0560\/3747\/4382\/files\/Robert_Charles_Counterbores_34307d1d-0fdf-426c-9946-13595a0d0665.png?v=1769685205"},{"product_id":"5760-m5","title":"Robert Charles Plain Shank Counterbore Standard Metric - M5","description":"\u003cdiv\u003e\n\u003cp\u003eThe Robert Charles Plain Shank Counterbore – Standard Metric (M5) is a precision cutting tool designed for accurate counterboring in metric hole work. Built for engineers, machinists, and workshop setups, it delivers stable performance and clean, repeatable results.\u003c\/p\u003e \u003cul\u003e\n\u003cli\u003e\n\u003cb\u003ePlain shank design\u003c\/b\u003e: Compatible with standard tool holders for quick mounting and consistent alignment across setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMetric size\u003c\/b\u003e: Standard Metric counterbore calibrated for M5 hole standards in general engineering and automotive tasks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCounterbore geometry\u003c\/b\u003e: Precisely formed cutting edge with a flat-bottom profile to seat fasteners flush and squarely.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eStable cutting performance\u003c\/b\u003e: Engineered to maintain steady engagement and reduce deviation during repeated passes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eIdeal applications\u003c\/b\u003e: Suitable for general engineering, automotive work, and workshop environments where precision and repeatability matter.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWith this counterbore, you can achieve smooth, flush fastener seating in metric holes, improving assembly quality and reducing rework. The plain shank and standard metric design simplify tool changes, support repeatable results across parts, and fit seamlessly with common machining setups. Whether you're building prototypes or performing routine maintenance, this tool helps you deliver consistent bore depths and clean edges in every job.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Robert Charles","offers":[{"title":"Default Title","offer_id":43411726237774,"sku":"5760-M5","price":44.24,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0560\/3747\/4382\/files\/Robert_Charles_Counterbores_0cd6b2cd-7dac-4396-a366-ee70095c6934.png?v=1769685209"},{"product_id":"5760-m6","title":"Robert Charles Plain Shank Counterbore Standard Metric - M6","description":"\u003cdiv\u003e\n\u003cp\u003e\nThe Robert Charles Plain Shank Counterbore – Standard Metric (M6) is a precision tool crafted for accurate counterboring in metric hole applications. Designed for engineers, machinists, and workshop professionals, it delivers repeatable, clean bores with reliable performance in everyday metalworking tasks.\n\u003c\/p\u003e \u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eShank type\u003c\/b\u003e: Plain shank designed for secure seating in standard tool holders.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSize designation\u003c\/b\u003e: Standard metric designation with M6 sizing to align with metric hole standards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCutting geometry\u003c\/b\u003e: Precision-ground edges to help achieve consistent bore diameters and clean surfaces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eDurability\u003c\/b\u003e: Robust construction built to withstand regular use in workshop environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCompatibility\u003c\/b\u003e: Compatible with common milling setups and machine tool configurations for versatile use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eApplications\u003c\/b\u003e: Ideal for general engineering, automotive, and maintenance tasks requiring precise counterbores.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\nThis counterbore provides stable performance and repeatable results across multiple parts, helping you reduce rework and improve assembly accuracy. The plain shank ensures smooth engagement with tool holders, contributing to a consistent cutting path and perpendicular bore bottoms. Perfect for standardizing metric hole preparation in a busy shop, it’s a dependable choice for professionals who value precision and efficiency in everyday machining.\n\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Robert Charles","offers":[{"title":"Default Title","offer_id":43411726303310,"sku":"5760-M6","price":47.4,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0560\/3747\/4382\/files\/Robert_Charles_Counterbores_0351b528-7072-48d0-9bfe-8971c96045a0.png?v=1769685214"},{"product_id":"5760-m8","title":"Robert Charles Plain Shank Counterbore Standard Metric - M8","description":"\u003cdiv\u003e\n\u003cp\u003eThe Robert Charles Plain Shank Counterbore – Standard Metric is a precision cutting tool designed for accurate counterboring in metric-hole applications. Suited for engineers, machinists, and workshop professionals, it delivers repeatable, clean bores with reliable performance.\u003c\/p\u003e \u003cul\u003e\n\u003cli\u003e\n\u003cb\u003ePlain shank design\u003c\/b\u003e: A standard cylindrical shank that fits common tool holders for quick setup and repeatable alignment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eStandard metric sizing\u003c\/b\u003e: M8 counterbore configuration tailored to metric hole standards and fastener applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePrecision-ground cutting edges\u003c\/b\u003e: Sharp, accurate form ensures clean, square counterbores with minimal burrs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eStable cutting performance\u003c\/b\u003e: Design optimized for consistent depth control and reduced deflection during operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eVersatile workshop use\u003c\/b\u003e: Ideal for general engineering, automotive, and maintenance tasks in busy shops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eReliability and durability\u003c\/b\u003e: Built to withstand daily use in professional environments while maintaining accuracy.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eThis counterbore helps you achieve flush-fastener seating with confidence, improving joint strength and surface finish. The compatible plain shank and metric sizing streamline setup across multiple pieces, saving time and reducing the likelihood of misalignment. By delivering clean walls and consistent depths, it minimizes rework, speeds assembly, and supports higher repeatability in production runs.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Robert Charles","offers":[{"title":"Default Title","offer_id":43411726401614,"sku":"5760-M8","price":61.62,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0560\/3747\/4382\/files\/Robert_Charles_Counterbores_a6264cb1-a179-4e9b-952d-33343112c85d.png?v=1769685219"},{"product_id":"5760-m10","title":"Robert Charles Plain Shank Counterbore Standard Metric - M10","description":"\u003cdiv\u003e\n\u003cp\u003e\nThe Robert Charles Plain Shank Counterbore – Standard Metric is a precision counterboring tool designed for reliable performance in metalworking. Built for professionals and serious hobbyists who work with metric hole standards, it pairs a plain shank with robust cutting capability to deliver stable, repeatable results.\n\u003c\/p\u003e \u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eSize\u003c\/b\u003e: Metric M10 counterbore designed for standard metric hole applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eShank type\u003c\/b\u003e: Plain shank for straightforward, secure seating in standard tool holders.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCutting performance\u003c\/b\u003e: Delivers stable cutting action and clean, consistent bottom surfaces for reliable finishes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eApplications\u003c\/b\u003e: Ideal for precision machining in general engineering, automotive, and workshop environments that require metric hole standards.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\nThis counterbore simplifies setup with its plain shank, supports repeatable depth and alignment across parts, and helps minimize rework. Its straightforward design focuses on dependable performance in metric counterboring tasks, making it a practical choice for workshops and production environments that demand consistent results.\n\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Robert Charles","offers":[{"title":"Default Title","offer_id":43411726434382,"sku":"5760-M10","price":77.42,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0560\/3747\/4382\/files\/Robert_Charles_Counterbores_afe41085-da03-4178-a1ec-534d9531dfb3.png?v=1769685223"},{"product_id":"5760-m12","title":"Robert Charles Plain Shank Counterbore Standard Metric - M12","description":"\u003cdiv\u003e\n\u003cp\u003e\nThe Robert Charles Plain Shank Counterbore – Standard Metric (M12) is a precision machining tool designed for accurate counterboring of metric holes. It’s built for engineers, machinists, and workshop teams who need reliable, repeatable results with straightforward setup in standard tool holders.\n\u003c\/p\u003e \u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eShank type\u003c\/b\u003e: Plain shank that fits directly into common tool holders for quick, secure mounting and stable alignment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMetric design\u003c\/b\u003e: Standard metric counterbore sized for M12 applications to ensure consistent results across parts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCounterbore geometry\u003c\/b\u003e: Clean, flat-bottom pockets that create precise seating surfaces for socket-head screws.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eApplication versatility\u003c\/b\u003e: Well suited for general engineering, automotive, and workshop use where precision and repeatability matter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eReliable performance\u003c\/b\u003e: Engineered to deliver stable cutting and reproducible results in everyday machining tasks.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\nThis counterbore helps you achieve consistent fastener seating with reduced finishing requirements, enabling faster setups and fewer touch-ups across batches. Its straightforward, plug-and-play compatibility with standard tool holders means less downtime and more productive machining sessions, whether you’re fabricating brackets, housings, or panels that rely on precise metric hole standards.\n\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Robert Charles","offers":[{"title":"Default Title","offer_id":43411726467150,"sku":"5760-M12","price":87.69,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0560\/3747\/4382\/files\/Robert_Charles_Counterbores_0272bbba-8013-4619-8a4b-00c2d4a2dabb.png?v=1769685228"}],"url":"https:\/\/www.protool-ltd.co.uk\/collections\/robert-charles-plain-shank-counterbores-standard-metric.oembed","provider":"Protool Precision Tools","version":"1.0","type":"link"}