{"product_id":"osg-1430501-spiral-flute-tap-5-16-18-unc-bottoming-hss","title":"Osg 1430501 Spiral Flute Tap 5\/16-18 Unc Bottoming Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 1430501 is a spiral flute bottoming tap designed to cut internal threads in a wide range of ferrous and non-ferrous materials. It produces a 5\/16-18 UNC right-hand thread to a 3B class of fit, with an H3 thread limit for consistent dimensional accuracy. The 50-degree helix angle on the three flutes efficiently evacuates chips up and out of the hole, making this tap well suited for blind-hole applications where chip packing is a common concern. Manufactured from high-speed steel and finished with a steam oxide coating, it offers improved lubricity and corrosion resistance during cutting operations. Machinists, tool-and-die tradespeople, and maintenance mechanics rely on this style of tap for production threading and repair work.\u003c\/p\u003e\u003cp\u003eThe OSG 1430501 is appropriate for threading blind holes in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. The bottoming chamfer allows threads to be cut close to the bottom of a hole, making it the preferred choice when thread engagement depth is limited by workpiece geometry. It is used in both manual tapping operations and CNC tapping with synchronous feed control. The Series 107 designation places this tap within a well-established OSG product family used across general machining, maintenance, and fabrication environments.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e5\/16-18 UNC thread form with 3B class of fit and H3 thread limit for controlled tolerance\u003c\/li\u003e\n\u003cli\u003eBottoming chamfer allows threading to near the bottom of blind holes\u003c\/li\u003e\n\u003cli\u003e50-degree helix angle promotes upward chip evacuation in blind-hole applications\u003c\/li\u003e\n\u003cli\u003eHigh-speed steel construction provides toughness across a broad range of workpiece materials\u003c\/li\u003e\n\u003cli\u003eSteam oxide coating improves lubricity and reduces galling during cutting\u003c\/li\u003e\n\u003cli\u003eRight-hand flute direction matches right-hand thread for standard tap wrench and machine spindle use\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. Coolant-through is not supported on this tap.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis tap is installed and operated by a licensed machinist or qualified maintenance mechanic using a tap wrench, tapping stand, or CNC machine with rigid or synchronous tapping capability. Before tapping, ensure the pilot hole is drilled to the correct tap drill diameter for a 5\/16-18 UNC thread and that the workpiece is securely fixtured. Apply cutting fluid appropriate for the workpiece material to extend tool life and improve thread quality. Do not reverse a bottoming tap into a hole that still has uncut material, as this risks tap breakage.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 5\/16-18\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClass of Fit\u003c\/strong\u003e: 3B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: H3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChamfer\u003c\/strong\u003e: Bottoming\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\u003eHelix Angle\u003c\/strong\u003e: 50 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: High-Speed Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: Steam Oxide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.719 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.78 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: 1.129 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSquare Length\u003c\/strong\u003e: 0.375 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 0.238 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 107\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.045 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: OSG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 1430501\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51743706317106,"sku":"1430501","price":53.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/8ce670c977dc6737ff09f02ce40f63c6.jpg?v=1788849363","url":"https:\/\/voomisupply.com\/products\/osg-1430501-spiral-flute-tap-5-16-18-unc-bottoming-hss","provider":"Voomi Supply","version":"1.0","type":"link"}