{"product_id":"value-collection-181-3j-solid-carbide-reverse-countersink","title":"Value Collection 181-3J Solid Carbide Reverse Countersink","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe VALUE COLLECTION 181-3J is a solid carbide reverse countersink designed for back-chamfering and countersinking operations where standard tooling cannot reach. With a 3\/8 inch cutter head diameter and a 1\/8 inch pilot hole diameter, this tool delivers precise, clean chamfers on the back face of drilled holes. The 100-degree included angle and bright polished coating reduce friction and improve chip evacuation. At 1\/2 inch overall length, the 181-3J is built for tight-access applications in metalworking, fabrication, and machining environments. Three flutes provide stable cutting action on a range of workpiece materials.\u003c\/p\u003e\u003cp\u003eThis reverse countersink is used in holemaking applications where the entry side of a hole is inaccessible or where a back chamfer is required after a through-hole has been drilled. It is suited for use in production machining, aerospace fabrication, and general metalworking shops. The 181-3J accepts both plain pilot type 185-2 and step pilot type 186-2, expanding its versatility across different hole diameters and pilot configurations.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSolid carbide construction for hardness, wear resistance, and dimensional stability\u003c\/li\u003e\n\u003cli\u003e3\/8 inch cutter head diameter with 1\/8 inch pilot hole diameter\u003c\/li\u003e\n\u003cli\u003e100-degree included angle for consistent back-chamfer geometry\u003c\/li\u003e\n\u003cli\u003eBright polished coating reduces friction and aids chip flow\u003c\/li\u003e\n\u003cli\u003eThree-flute design for smooth, stable cutting action\u003c\/li\u003e\n\u003cli\u003eCompatible with plain pilot 185-2 and step pilot 186-2\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eCompatible with plain pilot 185-2 and step pilot 186-2 pilot assemblies as specified by the manufacturer.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis tool is installed and operated by machinists and tooling technicians using standard drill press, CNC machining center, or hand-held power equipment. Secure the pilot firmly before engaging the cutter to prevent walking or chatter. Inspect the pilot hole diameter before use to confirm fit with the 1\/8 inch pilot. Follow shop-standard speeds and feeds for carbide tooling in the workpiece material being machined.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutter Head Diameter\u003c\/strong\u003e: 3\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePilot Hole Diameter\u003c\/strong\u003e: 1\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length (OAL)\u003c\/strong\u003e: 1\/2 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Angle\u003c\/strong\u003e: 100 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: Bright (Polished)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCut Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlain Pilot Compatibility\u003c\/strong\u003e: 185-2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep Pilot Compatibility\u003c\/strong\u003e: 186-2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication\u003c\/strong\u003e: Countersinking \/ Back Chamfering\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: VALUE COLLECTION\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 181-3J\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":68384256426290,"sku":"181-3J","price":261.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/0b441618a52864f0704663c116210db1_373f7347-3b0d-40df-a942-6de437ffbf69.jpg?v=1793901765","url":"https:\/\/voomisupply.com\/products\/value-collection-181-3j-solid-carbide-reverse-countersink","provider":"Voomi Supply","version":"1.0","type":"link"}