{"product_id":"hertel-52440708-cobalt-drill-bit-no-21-135-degree-split-point","title":"Hertel 52440708 Cobalt Drill Bit No. 21 135 Degree Split Point","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HERTEL 52440708 is a cobalt threaded-shank drill bit designed for drilling into high-tensile-strength metals where standard HSS bits fail or wear prematurely. It carries a No. 21 wire size designation with a decimal diameter of 0.1590 inches and an overall length of 1.25 inches. The 135-degree split point geometry self-centers on contact, reducing the need for a center punch and minimizing walking on hard or curved surfaces. A web-thinned, tapered-web construction lowers thrust requirements, and the oxide coating improves surface hardness and lubricity. This bit is sized for production and maintenance environments where precise hole diameter and clean entry matter.\u003c\/p\u003e\n\u003cp\u003eThis bit is built for use in high-tensile-strength metals including alloy steels, stainless, and similar hard materials encountered in aerospace, industrial fabrication, and mechanical assembly work. The 1\/4-28 threaded shank mates with compatible quick-change or threaded-shank drill holders used in production setups. With a flute length of 0.5625 inches (9\/16 inches) and a short overall length of 1.25 inches, it is suited to confined spaces and close-tolerance drilling operations where a longer bit would flex or chatter. It conforms to NAS 965 Type D specification, making it appropriate for aerospace and defense maintenance applications.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCobalt construction with oxide coating for extended tool life in hard metals\u003c\/li\u003e\n  \u003cli\u003e135-degree split point self-centers and reduces walking on entry\u003c\/li\u003e\n  \u003cli\u003eWeb-thinned, tapered web reduces axial thrust during drilling\u003c\/li\u003e\n  \u003cli\u003e1\/4-28 threaded square shank for use with compatible threaded-shank holders\u003c\/li\u003e\n  \u003cli\u003eShort OAL of 1.25 inches improves rigidity in tight clearance applications\u003c\/li\u003e\n  \u003cli\u003eMeets NAS 965 Type D specification\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with threaded-shank drill holders accepting a 1\/4-28 shank thread. Intended for general-purpose drilling in high-tensile-strength metals per NAS 965 Type D specification.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstall and remove this bit only with the drill press or power tool fully de-energized and the chuck or holder confirmed stationary. Ensure the threaded shank is fully engaged and seated in the holder before operation. Use appropriate cutting fluid or lubricant when drilling hard or stainless alloys to prevent work hardening and premature bit wear. Right-hand cutting direction only  -  do not run in reverse.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Wire)\u003c\/strong\u003e: No. 21\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.1590 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\u003eOverall Length\u003c\/strong\u003e: 1.25 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 0.5625 inches (9\/16 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Square Threaded\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Thread Size\u003c\/strong\u003e: 1\/4-28\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Spiral\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpiral Type\u003c\/strong\u003e: 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: Cobalt\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Finish\/Coating\u003c\/strong\u003e: Oxide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Application\u003c\/strong\u003e: High-Tensile Strength Metal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpecification\u003c\/strong\u003e: NAS 965 Type D\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBit Type\u003c\/strong\u003e: Short\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.15 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: HERTEL\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 52440708\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51742210064690,"sku":"52440708","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/5fce6d6869e4381078e7a70a78a31210.jpg?v=1788835916","url":"https:\/\/voomisupply.com\/products\/hertel-52440708-cobalt-drill-bit-no-21-135-degree-split-point","provider":"Voomi Supply","version":"1.0","type":"link"}