{"product_id":"osg-1757701-spiral-point-tap-1-4-28-unf-plug-h3","title":"Osg 1757701 Spiral Point Tap 1\/4-28 Unf Plug H3","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 1757701 is a spiral point plug tap designed for threading 1\/4-28 UNF internal threads in demanding materials. Built from powdered metal and finished with a steam oxide coating, it delivers added lubricity and corrosion resistance compared to uncoated high-speed steel taps. The plug chamfer distributes cutting force across several leading threads, making it well-suited for through-hole applications. With an H3 thread limit and 3B class of fit, this tap produces threads within the tolerance range required for standard fastener assemblies. Machinists, tool-and-die technicians, and maintenance mechanics use this tap for production and repair work in metals that demand higher tool toughness and wear resistance.\u003c\/p\u003e\u003cp\u003eThis tap is rated for use in hardened steel, stainless steel, high-nickel alloy, titanium, alloy steel, and die steel. Its spiral point geometry pushes chips ahead of the cut, keeping the flute path clear in through-hole setups. The right-hand cutting direction and standard shank make it compatible with conventional tap handles, tapping heads, and CNC rigid tapping setups. Series 312 designation places it within OSGs standard catalog of inch-series spiral point taps for trade and production environments.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e1\/4-28 UNF thread form, right-hand cut, H3 thread limit\u003c\/li\u003e\n\u003cli\u003ePlug chamfer for through-hole threading applications\u003c\/li\u003e\n\u003cli\u003ePowdered metal construction for increased toughness in difficult alloys\u003c\/li\u003e\n\u003cli\u003eSteam oxide coating improves lubricity and reduces galling on stainless and high-nickel materials\u003c\/li\u003e\n\u003cli\u003e3-flute spiral point design pushes chips forward, reducing clogging in through-holes\u003c\/li\u003e\n\u003cli\u003eNo coolant-through requirement; suitable for use with cutting oil or tapping fluid\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eRated for threading hardened steel, stainless steel, high-nickel alloy, titanium, alloy steel, and die steel. Designed for through-hole tapping in 1\/4-28 UNF applications across production machining and maintenance repair operations.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis tap is installed by machinists or maintenance technicians using a tap handle, tapping fixture, or CNC tapping head set to right-hand rotation. Always apply an appropriate cutting fluid or tapping compound before starting the thread to extend tool life and reduce the risk of tap breakage, especially in stainless steel and high-nickel alloys. Back out periodically when hand-tapping to break and clear chips. Inspect the tap for chipping or wear before each use; a damaged tap should not be returned to service.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/4-28 UNF\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNF\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChamfer Type\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\u003eMaterial\u003c\/strong\u003e: Powdered Metal\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: 2.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.62 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.255 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: 312\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.033 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: 1757701\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51747723673906,"sku":"1757701","price":56.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/e65ab8f5c0621567fe13d495027bd604.jpg?v=1788884675","url":"https:\/\/voomisupply.com\/products\/osg-1757701-spiral-point-tap-1-4-28-unf-plug-h3","provider":"Voomi Supply","version":"1.0","type":"link"}