{"product_id":"hertel-18607-countersink-5-16-in-90-degree-4-flute-hss","title":"Hertel 18607 Countersink 5\/16 in 90 Degree 4 Flute Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HERTEL 18607 is a straight-shank countersink designed for creating clean, beveled seat profiles in metal, plastic, and composite workpieces. Built from high speed steel (HSS), it delivers consistent cutting performance across a wide range of materials without rapid edge degradation. The 5\/16 inch head diameter and 90-degree included angle make it well suited for standard flat-head fastener seating applications. The 1\/4 inch straight-cylindrical shank fits directly into standard drill chucks and quick-change collet holders. With 4 flutes, this countersink produces a smoother finish and reduces chatter compared to single-flute designs. Machinists, toolroom technicians, and maintenance professionals use this tool for production and repair work alike.\u003c\/p\u003e\n\u003cp\u003eThe HERTEL 18607 is appropriate for light-to-medium duty countersinking in ferrous and non-ferrous metals, plastics, and similar materials. It is commonly used in manufacturing, fabrication shops, and field maintenance environments where flat-head machine screws or bolts require a properly seated countersink. The 90-degree angle matches the most widely used flat-head fastener geometry in both inch and metric applications. Its compact 5\/16 inch head diameter suits smaller fastener patterns and tight-tolerance work where larger countersinks would cause interference.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e5\/16 inch head diameter for standard small-fastener countersink profiles\u003c\/li\u003e\n  \u003cli\u003e90-degree included angle matches common flat-head screw geometry\u003c\/li\u003e\n  \u003cli\u003e4 flutes for reduced chatter and improved surface finish\u003c\/li\u003e\n  \u003cli\u003eHigh speed steel construction for durability across a range of workpiece materials\u003c\/li\u003e\n  \u003cli\u003e1\/4 inch straight-cylindrical shank compatible with standard drill chucks and collet holders\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or direct tooling addition for use in standard 1\/4 inch straight-shank drill chucks and collet systems commonly found in drill presses, hand drills, and CNC spindle setups.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis tool is installed by a machinist or toolroom technician into a compatible 1\/4 inch drill chuck or collet holder. Ensure the machine is fully powered down and the spindle is locked before changing tooling. Use appropriate RPM settings for the workpiece material per standard machining references — higher speeds for aluminum and plastics, lower speeds for hardened steel. Eye protection and chip guards should be in place during operation per standard shop safety practices.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Diameter\u003c\/strong\u003e: 5\/16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIncluded Angle\u003c\/strong\u003e: 90 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 1\/4 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: High Speed Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 27112812\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: HERTEL\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 18607\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51727402434866,"sku":"18607","price":36.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/3d44daa6457f35f38ca3da4589fa1494.jpg?v=1788677427","url":"https:\/\/voomisupply.com\/products\/hertel-18607-countersink-5-16-in-90-degree-4-flute-hss","provider":"Voomi Supply","version":"1.0","type":"link"}