{"product_id":"cleveland-c58581-spiral-flute-tap-3-8-16-unc-plug-hss","title":"Cleveland C58581 Spiral Flute Tap 3\/8-16 Unc Plug Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe CLEVELAND C58581 is a spiral flute tap designed for cutting internal threads in blind holes. It runs a 3\/8-16 UNC thread profile with a plug chamfer lead, making it well suited for through-start threading applications that require a fast, efficient chip evacuation path. Built from high speed steel (HSS) with a bright, uncoated finish, the tap holds an H3 thread limit and a 3B class of fit, delivering consistent tolerance control in production and maintenance threading work. The 52-degree helix angle drives chips up and out of the flute, which is critical when threading blind holes where chip packing causes tap breakage and poor thread quality. Licensed machinists, toolroom technicians, and general maintenance trades use this tap with standard tap handles or CNC tapping equipment.\u003c\/p\u003e\n\u003cp\u003eThe C58581 is rated for threading alloy tool steel, carbon steel, and stainless steel. The three-flute, right hand spiral flute geometry with a fast flute style suits applications in metal fabrication shops, maintenance facilities, and job shops where blind hole threading is routine. With an overall length of 2.938 inches and a thread length of 0.75 inches, the tap fits standard tap holders sized for 3\/8-inch shanks. The 3B class of fit is appropriate for general-purpose fastener applications requiring a standard tolerance threaded hole.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e3\/8-16 UNC thread profile with plug chamfer for guided thread entry\u003c\/li\u003e\n  \u003cli\u003e52-degree helix angle promotes upward chip evacuation in blind holes\u003c\/li\u003e\n  \u003cli\u003eH3 thread limit with 3B class of fit for consistent tolerance control\u003c\/li\u003e\n  \u003cli\u003eHigh speed steel construction for durability across ferrous material applications\u003c\/li\u003e\n  \u003cli\u003eRight hand flute and right hand thread, fast flute style for efficient cutting\u003c\/li\u003e\n  \u003cli\u003eBright uncoated finish suitable for use with standard cutting fluids\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eRated for use in alloy tool steel, carbon steel, and stainless steel. Part of Cleveland Series 1093 and 1094. Designed for standard 3\/8-inch tap holders and compatible CNC or manual tapping equipment accepting that shank size.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis tap is installed by a machinist or maintenance technician using a T-handle tap wrench, tap driver, or CNC tapping head. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter for a 3\/8-16 UNC thread before starting. Apply an appropriate cutting fluid for the workpiece material, particularly when tapping stainless steel, to reduce heat buildup and extend tap life. Never force a spiral flute tap through chip packing in a blind hole — back off periodically to clear flutes and prevent breakage.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 3\/8-16\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 3\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Style\u003c\/strong\u003e: Fast\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHelix Angle\u003c\/strong\u003e: 52 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChamfer\u003c\/strong\u003e: Plug\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Right Hand\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\u003eThreads per Inch\u003c\/strong\u003e: 16\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.75 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.938 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.318 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNeck Length\u003c\/strong\u003e: 0.51 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Length\u003c\/strong\u003e: 0.4375 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 0.286 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\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication\u003c\/strong\u003e: Blind Hole Threading\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Application\u003c\/strong\u003e: Alloy Tool Steel, Carbon Steel, Stainless Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 1093, 1094\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.1333 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: CLEVELAND\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: C58581\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CLEVELAND CONTROLS","offers":[{"title":"Default Title","offer_id":51693322862898,"sku":"C58581","price":55.93,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/be6e6a6e84e5b6aca98d36ec938733d7.jpg?v=1788310617","url":"https:\/\/voomisupply.com\/products\/cleveland-c58581-spiral-flute-tap-3-8-16-unc-plug-hss","provider":"Voomi Supply","version":"1.0","type":"link"}