{"product_id":"hertel-66693839-jobber-drill-bit-letter-j-tin-hss","title":"Hertel 66693839 Jobber Drill Bit Letter J Tin Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL 66693839 is a letter-J jobber-length drill bit designed for production holemaking in metal, wood, and composite materials. It is manufactured from high speed steel with a titanium nitride (TiN) coating that extends cutting life and reduces heat buildup at the cutting edge. The split point at 135 degrees starts on contact without a center punch and reduces walking on flat or curved surfaces. With an overall length of 4.125 inches and a flute length of 2.875 inches, it fits standard drill chucks and drill press spindles. This is a heavy-duty grade bit suited for shop, field, and maintenance use.\u003c\/p\u003e\u003cp\u003eThe 66693839 is used wherever a 0.2770-inch (letter J) hole is required. Typical applications include metalworking, fabrication, HVAC equipment assembly, plumbing rough-in, electrical panel work, and general maintenance tasks. The jobber-series length is the standard choice for through-hole and blind-hole work in materials of moderate thickness. A straight-cylindrical shank with a diameter of 0.2770 inches seats directly in keyless or keyed chucks across most portable drills, drill presses, and mill collets.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e135-degree split point starts on contact and reduces drill walking without center punching\u003c\/li\u003e\n\u003cli\u003eTiN coating increases surface hardness and extends tool life compared to uncoated HSS\u003c\/li\u003e\n\u003cli\u003eHigh speed steel construction handles steel, aluminum, cast iron, and most plastics\u003c\/li\u003e\n\u003cli\u003eWeb-thinned, tapered web design reduces thrust and improves chip evacuation\u003c\/li\u003e\n\u003cli\u003eRegular spiral, 2-flute configuration clears chips efficiently in through-hole and blind-hole applications\u003c\/li\u003e\n\u003cli\u003eHeavy-duty grade construction rated to NAS specification\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard jobber-length drill bit with a straight-cylindrical shank; fits any keyed or keyless drill chuck or collet sized for a 0.2770-inch shank diameter.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstall and remove the bit only when the drill or drill press is powered off and at a full stop. Secure the shank fully into the chuck with no less than the minimum recommended grip depth for the chuck model in use. Use cutting fluid or coolant when drilling ferrous metals to preserve coating life, except where the tool is used in a dry-cutting setup rated for TiN-coated tooling. Worn or chipped bits should be replaced rather than reground without proper relief-angle tooling.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Letter)\u003c\/strong\u003e: J\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.2770 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 4.125 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 2.875 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.2770 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\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\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 (Regular)\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\u003eDrill Bit Material\u003c\/strong\u003e: High Speed Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: TiN (Titanium Nitride)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Grade\u003c\/strong\u003e: Heavy Duty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification Designation\u003c\/strong\u003e: NAS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble Margin\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize Range\u003c\/strong\u003e: 0.2500 to 0.3000 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.12 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: HERTEL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 66693839\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51739410727218,"sku":"66693839","price":17.02,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/5f496ffd90a8646c5df924a87a0ec424.jpg?v=1788814280","url":"https:\/\/voomisupply.com\/products\/hertel-66693839-jobber-drill-bit-letter-j-tin-hss","provider":"Voomi Supply","version":"1.0","type":"link"}