{"product_id":"chicago-latrobe-41774-jobber-drill-bit-letter-d-tin-hss","title":"Chicago-latrobe 41774 Jobber Drill Bit Letter D Tin Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe CHICAGO-LATROBE 41774 is a jobber-length drill bit sized to Letter D, designed for high-performance drilling in ferrous metals and hard alloys. Built from High Speed Steel (HSS) with a Titanium Nitride (TiN) coating, the bit delivers extended tool life and reduced heat buildup compared to uncoated HSS. The 135-degree split point promotes self-centering and reduces walking on hard surfaces, eliminating the need for a center punch in most setups. Overall length is 4 inches with a flute length of 2.75 inches and a straight cylindrical shank diameter of 0.25 inches. Classified as a heavy-duty grade bit, it meets NAS 907 Type B standards and suits demanding production and maintenance environments.\u003c\/p\u003e\u003cp\u003eThe 41774 is intended for drilling cast iron, stainless steel, and carbon steel in both shop and field applications. The two-flute spiral configuration evacuates chips efficiently, making it well-suited for through-hole drilling in structural steel, fabrication work, and MRO maintenance tasks. The web-thinned, tapered web design reduces thrust requirements, which is especially beneficial when drilling stainless steel or other work-hardening materials. A licensed machinist, millwright, or experienced tradesperson would typically deploy this bit in a drill press, CNC machine, or heavy-duty hand drill.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eLetter D size with 135-degree split point for self-centering and reduced thrust\u003c\/li\u003e\n\u003cli\u003eTiN coating extends wear resistance and reduces friction during cutting\u003c\/li\u003e\n\u003cli\u003eHigh Speed Steel construction rated for cast iron, stainless steel, and carbon steel\u003c\/li\u003e\n\u003cli\u003eWeb-thinned tapered web reduces required feed force on tough materials\u003c\/li\u003e\n\u003cli\u003eMeets NAS 907 Type B specification for heavy-duty grade performance\u003c\/li\u003e\n\u003cli\u003eRight-hand spiral flute design promotes efficient chip evacuation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a jobber-length replacement or production bit compatible with standard 0.25-inch straight-shank drill chucks. Primary workpiece materials are cast iron, stainless steel, and steel per Series 150ASP-TN application data.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eSecure the straight cylindrical shank firmly in a keyed or keyless chuck rated for the shank diameter before use. De-energize and lock out any machine tool before changing bits, per standard lockout\/tagout procedures. Apply cutting fluid when drilling stainless steel or other work-hardening alloys to minimize heat buildup and prolong coating life. Avoid excessive feed pressure, which can cause premature point wear or bit breakage in hard materials.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size\u003c\/strong\u003e: Letter D\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length (OAL)\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 2.75 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 135 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Split Point\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Spiral\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered Web-Thinned\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: High Speed Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish\/Coating\u003c\/strong\u003e: Titanium Nitride (TiN)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrade\u003c\/strong\u003e: Heavy Duty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 150ASP-TN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Materials\u003c\/strong\u003e: Cast Iron, Stainless Steel, Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: NAS 907 Type B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.5 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: CHICAGO-LATROBE\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 41774\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CHICAGO-LATROBE","offers":[{"title":"Default Title","offer_id":51732112212274,"sku":"41774","price":16.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/40c328d383aaf44828da56d6b970c3e4.jpg?v=1788739332","url":"https:\/\/voomisupply.com\/products\/chicago-latrobe-41774-jobber-drill-bit-letter-d-tin-hss","provider":"Voomi Supply","version":"1.0","type":"link"}