{"product_id":"heli-coil-8cpb-hand-sti-tap-1-2-13-unc-h3-plug-chamfer","title":"Heli-coil 8CPB Hand Sti Tap 1\/2-13 Unc H3 Plug Chamfer","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HELI-COIL 8CPB is a hand STI tap designed to cut threads sized for wire thread insert installation in 1\/2-13 UNC applications. Built from high-speed steel with a bright uncoated finish, it features 4 flutes and a plug chamfer for starting in through-holes or deep blind holes with adequate clearance. The H3 thread limit and 3B class of fit ensure the resulting threads accept standard helical coil inserts with proper tolerance. Overall length is 3-13\/16 inches with a thread length of 1-13\/16 inches. Licensed machinists, maintenance technicians, and tool-and-die professionals use this tap when repairing stripped or damaged threads in metal components.\u003c\/p\u003e\n\u003cp\u003eThe 8CPB is used in thread repair applications across industrial maintenance, aerospace, automotive, and general manufacturing environments. It is applied wherever a standard thread needs to be restored to accept a HELI-COIL wire insert, effectively bringing the repaired fastener bore back to original specification. The plug chamfer makes it suitable for through-hole and deeper blind-hole configurations where there is sufficient thread runout. It is driven by hand using a tap wrench, making it practical for field service, bench repair, and production rework operations.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSTI thread form sized for HELI-COIL wire insert installation in 1\/2-13 UNC thread repairs\u003c\/li\u003e\n  \u003cli\u003eH3 thread limit with 3B class of fit for consistent insert-ready thread tolerance\u003c\/li\u003e\n  \u003cli\u003e4-flute geometry for balanced cutting and chip clearance in metallic workpieces\u003c\/li\u003e\n  \u003cli\u003ePlug chamfer allows starting in through-holes and blind holes with adequate depth\u003c\/li\u003e\n  \u003cli\u003eHigh-speed steel construction provides durability across ferrous and non-ferrous materials\u003c\/li\u003e\n  \u003cli\u003eBright uncoated finish with no additional coating to affect dimensional accuracy\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with HELI-COIL wire thread inserts in 1\/2-13 UNC thread repair applications. Accepts a standard tap wrench via the square drive shank.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis tap is operated by hand using a tap wrench  -  power driving is not recommended and may result in tap breakage or out-of-tolerance threads. Ensure the workpiece is secured and the bore is center-drilled to the correct STI tap drill size before tapping. Apply cutting fluid appropriate to the workpiece material throughout the operation. Follow the insert manufacturer guidelines for insert installation after tapping is complete.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/2-13 UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: H3\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClass of Fit\u003c\/strong\u003e: 3B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChamfer\u003c\/strong\u003e: Plug\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 1-13\/16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3-13\/16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.4800 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 0.3600 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Length\u003c\/strong\u003e: 9\/16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: High-Speed Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Bright\/Uncoated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.16 pounds\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: HELI-COIL\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 8CPB\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HELI-COIL","offers":[{"title":"Default Title","offer_id":52023034118450,"sku":"8CPB","price":82.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/db5f728b8860dc8ee4d4d0f37cd5e95f.jpg?v=1790013741","url":"https:\/\/voomisupply.com\/products\/heli-coil-8cpb-hand-sti-tap-1-2-13-unc-h3-plug-chamfer","provider":"Voomi Supply","version":"1.0","type":"link"}