{"product_id":"5770-5-16-1-32-over","title":"Robert Charles Plain Shank Counterbore M35-HSS-E 5% Cobalt - 5\/16 Cap Screw Size - 0.343 Pilot Size","description":"\u003cdiv\u003e\n\u003cp\u003e\nEngineered for precision counterboring, the Robert Charles Plain Shank Counterbore delivers durable, reliable performance for machinists, engineers, and automotive shops that require clean, consistent holes. Crafted from M35 HSS-E with 5% cobalt, it excels under demanding cutting conditions to maintain sharpness and accuracy over time.\n\u003c\/p\u003e \u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eMaterial\u003c\/b\u003e: M35 HSS-E with 5% cobalt for enhanced heat resistance, wear life, and cutting performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eShank type\u003c\/b\u003e: Plain shank designed for straightforward fitment in standard tool holders and stable machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePilot size\u003c\/b\u003e: 0.343\" pilot diameter to align the hole accurately during counterboring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCap screw compatibility\u003c\/b\u003e: 5\/16\" cap screw size for secure workholding and repeatable setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCounterbore geometry\u003c\/b\u003e: Optimized geometry for clean, precise counterbores with consistent chip control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eApplications\u003c\/b\u003e: Ideal for precision engineering, automotive fabrication, and general workshop use where durable, repeatable results are essential.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\nThis counterbore is built to deliver dependable performance across repetitive tasks and challenging materials. The combination of cobalt-enhanced HSS-E and a stable plain shank means you can rely on accurate bore depths, smooth chip formation, and a clean bottom for flush screw seating. It’s a practical, high-value choice for professionals who value consistency and efficiency in every project.\n\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Robert Charles","offers":[{"title":"Default Title","offer_id":43411728171086,"sku":"5770-5\/16-1\/32 OVER","price":47.4,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0560\/3747\/4382\/files\/Robert_Charles_Counterbores_5622a1e2-7422-4bb7-9633-9fab31ff7f94.png?v=1769685326","url":"https:\/\/www.protool-ltd.co.uk\/products\/5770-5-16-1-32-over","provider":"Protool Precision Tools","version":"1.0","type":"link"}