{"product_id":"chicago-latrobe-54124-cobalt-drill-bit-letter-y-0-4040-in","title":"Chicago-latrobe 54124 Cobalt Drill Bit Letter Y 0.4040 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe CHICAGO-LATROBE 54124 is a cobalt jobber length drill bit sized to Letter Y (0.4040 inches) and built for demanding metalworking applications. The bit features a 135-degree split point that self-centers on contact, reducing walking and the need for a center punch. A titanium nitride (TiN) coating increases surface hardness and extends tool life in abrasive materials. The two-flute spiral design with a regular helix promotes efficient chip evacuation. At 5.25 inches overall length with a 3.875-inch flute length, it fits standard drill chucks and drill presses used in fabrication, MRO, and maintenance work. This is a heavy-duty, high-performance tool built to M42 cobalt high-speed steel standards.\u003c\/p\u003e\n\u003cp\u003eThe 54124 is designed for drilling stainless steel and steel, including difficult-to-machine alloys where standard HSS bits lose edge quickly. The TiN coating and M42 cobalt substrate handle the heat generated in stainless steel applications. A straight cylindrical shank with a 0.4040-inch diameter seats cleanly in keyed or keyless chucks. Typical install scenarios include structural fabrication shops, pipe fitting, and maintenance crews working on stainless fastener holes or precision-clearance bores. Conforms to DIN 338 and NAS 907 Type J standards.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eLetter Y size, 0.4040 inches decimal equivalent, with diameter tolerance of -0.0010 to 0.0000 inches\u003c\/li\u003e\n  \u003cli\u003e135-degree split point with web thinning for self-centering starts and reduced thrust\u003c\/li\u003e\n  \u003cli\u003eM42 cobalt high-speed steel construction for heat resistance in stainless steel and alloy steel\u003c\/li\u003e\n  \u003cli\u003eTitanium nitride (TiN) coating extends surface hardness and tool life\u003c\/li\u003e\n  \u003cli\u003eTapered web configuration with regular spiral flute for controlled chip evacuation\u003c\/li\u003e\n  \u003cli\u003eMeets DIN 338 and NAS 907 Type J standards; Series 2550 heavy-duty grade\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or direct-use drill bit for applications requiring a Letter Y (0.4040-inch) jobber length bit in stainless steel and steel. Compatible with standard straight-shank drill chucks on hand drills, drill presses, and CNC drilling equipment.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis bit is installed by machinists, fabricators, and maintenance technicians using standard keyed or keyless drill chucks. Secure the straight cylindrical shank fully in the chuck before operation and verify runout is within acceptable limits. Use appropriate cutting fluid or coolant when drilling stainless steel to manage heat buildup and extend tool life. Replace the bit if point geometry is visibly degraded, as a dull split point on stainless steel increases heat and work hardening risk.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Letter)\u003c\/strong\u003e: Y\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.4040 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Material\u003c\/strong\u003e: Cobalt (M42 HSS)\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\u003eFlute Type\u003c\/strong\u003e: Spiral, Regular Helix\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish\/Coating\u003c\/strong\u003e: Titanium Nitride (TiN)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 5.25 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 3.875 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.4040 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 1.375 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiameter Tolerance\u003c\/strong\u003e: -0.0010 to 0.0000 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered, Web-Thinned\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Stainless Steel, Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: DIN 338, NAS 907 Type J\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 2550\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.8 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: CHICAGO-LATROBE\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 54124\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CHICAGO-LATROBE","offers":[{"title":"Default Title","offer_id":51748700258610,"sku":"54124","price":41.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/53321611ae18189069a461cf323e8448.jpg?v=1788896952","url":"https:\/\/voomisupply.com\/products\/chicago-latrobe-54124-cobalt-drill-bit-letter-y-0-4040-in","provider":"Voomi Supply","version":"1.0","type":"link"}