{"product_id":"accupro-4500380-screw-machine-drill-bit-21-64-in-carbide","title":"Accupro 4500380 Screw Machine Drill Bit 21\/64 in Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe ACCUPRO 4500380 is a screw machine length drill bit designed for high-performance drilling in demanding metalworking applications. Built from solid carbide and coated with TiAlN (titanium aluminum nitride), this bit delivers extended tool life and thermal resistance under heavy cutting conditions. It carries a 140-degree web-thinned point angle optimized for accurate entry and reduced thrust force. The overall length is 3.937 inches, with a straight cylindrical shank diameter of 0.3438 inches and a right-hand spiral flute configuration. Two regular spiral flutes provide efficient chip evacuation. Coolant-through capability supports high-speed machining where through-spindle coolant is available. Machinists, tool-and-die technicians, and CNC operators are the primary installers of this bit.\u003c\/p\u003e\n\u003cp\u003eThis drill bit is engineered for stainless steels as the primary workpiece material, making it well suited for production machining, fabrication shops, and maintenance environments where hard-to-machine alloys are common. The screw machine length format offers a shorter, more rigid profile compared to jobber-length bits, reducing deflection in close-tolerance drilling operations. It fits standard straight-shank drill chucks and collet holders in both manual and CNC machine tools. The 3xD flute-to-diameter ratio and R-thinned web geometry support consistent, repeatable hole quality at the 0.3281-inch diameter range.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSolid carbide construction for rigidity and wear resistance in stainless steel and hard alloys\u003c\/li\u003e\n  \u003cli\u003eTiAlN coating provides thermal resistance and extends cutting edge life at elevated temperatures\u003c\/li\u003e\n  \u003cli\u003e140-degree web-thinned point reduces entry thrust and improves centering accuracy\u003c\/li\u003e\n  \u003cli\u003eCoolant-through design supports through-spindle coolant delivery for heat management\u003c\/li\u003e\n  \u003cli\u003eScrew machine length body offers a shorter, stiffer profile that minimizes drill walk and deflection\u003c\/li\u003e\n  \u003cli\u003eRight-hand cut with regular spiral flutes for efficient chip removal in ferrous materials\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a direct-fit replacement for screw machine length drill bits with a 0.3438-inch straight cylindrical shank, compatible with standard drill chucks and collet systems accepting that shank diameter. Part of the ACCUPRO ASSC140-TA-CL series covering the 0.3000 to 0.3500 inch diameter range.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstall and remove drill bits only with the machine powered down and the spindle fully stopped. Verify that the chuck or collet holder is rated for the shank diameter before securing the bit. Use appropriate cutting fluid or confirm through-coolant pressure settings before initiating cuts in stainless steel. Inspect the cutting edge and coating condition before each use, as carbide tooling can chip if impacted or dropped.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter (Fractional)\u003c\/strong\u003e: 21\/64 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter (Decimal)\u003c\/strong\u003e: 0.3281 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.937 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 1.673 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.3438 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 140 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: TiAlN\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: Regular Spiral\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Web-Thinned (R-Thinned)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight Cylindrical\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Stainless Steels\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 3xD\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: ASSC140-TA-CL\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpecification Designation\u003c\/strong\u003e: ISO\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.17 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\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: ACCUPRO\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 4500380\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ACCUPRO","offers":[{"title":"Default Title","offer_id":51728141615410,"sku":"4500380","price":169.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/9f46e1efc38a2bac8dcda2787a85f41f.jpg?v=1788688676","url":"https:\/\/voomisupply.com\/products\/accupro-4500380-screw-machine-drill-bit-21-64-in-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}