{"product_id":"osg-1400105100-thread-forming-tap-4-40-unc-bottoming","title":"Osg 1400105100 Thread Forming Tap 4-40 Unc Bottoming","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 1400105100 is a thread forming tap designed for cold-forming internal threads without cutting, eliminating chips and reducing the risk of tap breakage in blind holes. Built from cobalt high-speed steel with a bright finish, this bottoming-style tap in the HY-PRO NRT series produces Class 2B threads to a Thread Limit of H5. The 4-40 UNC designation means 40 threads per inch on a No. 4 diameter fastener. With an overall length of 1.875 inches and a tapping depth of 0.559 inches, it is suited for tight workspaces where a standard chamfer would leave too many unformed threads near the bottom of a blind hole. Machinists and toolroom techs are the primary users.\u003c\/p\u003e\n\u003cp\u003eThis tap is engineered for blind hole threading applications across a broad range of workpiece materials, including alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum. The bottoming chamfer of 1 to 1.5 chamfered threads allows the forming action to begin as close to the bottom of a blind hole as possible. It is commonly used in precision machining, maintenance and repair operations, and production environments where chipless thread forming is preferred for strength and hole integrity.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eThread forming (chipless) design eliminates chip evacuation concerns in blind holes\u003c\/li\u003e\n  \u003cli\u003eCobalt HSS construction provides heat and wear resistance for tough materials including hardened steel and stainless steel\u003c\/li\u003e\n  \u003cli\u003eBottoming chamfer (1 to 1.5P) maximizes usable thread depth in blind holes\u003c\/li\u003e\n  \u003cli\u003eH5 thread limit holds Class 2B fit for consistent, accurate thread geometry\u003c\/li\u003e\n  \u003cli\u003eRight-hand thread direction, 4-40 UNC at 40 threads per inch\u003c\/li\u003e\n  \u003cli\u003eNo coolant-through requirement simplifies tooling setup\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use in blind hole threading applications on alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum workpieces. Material Application Codes P and N confirm suitability for steel and non-ferrous material groups. Part of the OSG Series 14001 HY-PRO NRT line.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThread forming taps require a properly sized forming tap drill hole, which is typically larger than a standard cut tap drill size for the same thread — consult an OSG or industry forming tap drill chart for the correct pilot hole diameter before tapping. Apply a suitable tapping fluid or cutting oil rated for the workpiece material to reduce friction during the forming process. Secure the workpiece and use a calibrated tapping head or reversible drill press to maintain axial alignment and avoid galling. Do not use thread forming taps in through-hole applications where chip-clearing geometry would normally be specified.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 4-40\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThreads per Inch\u003c\/strong\u003e: 40\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChamfer\u003c\/strong\u003e: Bottoming\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChamfered Threads\u003c\/strong\u003e: 1 to 1.5P\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClass of Fit\u003c\/strong\u003e: 2B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Limit\u003c\/strong\u003e: H5\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Cobalt\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Bright\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 1.875 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.295 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTapping Depth\u003c\/strong\u003e: 0.559 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.141 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Size\u003c\/strong\u003e: 0.110 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSquare Length\u003c\/strong\u003e: 0.1875 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication\u003c\/strong\u003e: Blind Hole Threading\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Application\u003c\/strong\u003e: Alloy Steel, Aluminum, Carbon Steel, Die Steel, Hardened Steel, Stainless Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: HY-PRO NRT (14001)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.01 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: OSG\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 1400105100\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51752699429170,"sku":"1400105100","price":35.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/7959fc02f92cc3c24f6b648da3b9221d.jpg?v=1788929816","url":"https:\/\/voomisupply.com\/products\/osg-1400105100-thread-forming-tap-4-40-unc-bottoming","provider":"Voomi Supply","version":"1.0","type":"link"}