{"product_id":"robbjack-t12-403-08-square-end-mill-1-4-in-4-flute-carbide","title":"Robbjack T12-403-08 Square End Mill 1\/4 in 4 Flute Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ROBBJACK T12-403-08 is a solid carbide square end mill from the T12-403 series, designed for precision milling operations in metalworking and machining environments. It features a 1\/4 inch cutting diameter, a 5\/16 inch length of cut, and a 3\/8 inch straight cylindrical shank. With 4 flutes and a 30-degree helix angle, it delivers efficient chip evacuation and stable cutting performance. The stub length configuration and 2-1\/2 inch overall length make it well-suited for applications where rigidity and close-tolerance milling are priorities. This end mill is uncoated and centercutting, allowing both peripheral and plunge cutting. It is rated under the Tuffy material grade, indicating toughness for demanding cuts.\u003c\/p\u003e\u003cp\u003eThis end mill is intended for use in CNC machining centers and manual milling machines where precise slotting, profiling, and pocketing are required. The right-hand cut and right-hand spiral flute geometry is standard for conventional mill spindle setups. Its stub length and solid carbide construction make it appropriate for short-reach finish and semi-finish operations in ferrous and non-ferrous materials. Machinists and CNC operators in job shops, toolrooms, and production environments will find this end mill applicable to a wide range of common milling tasks.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e1\/4 inch cutting diameter with a plus 0.001 \/ minus 0.000 inch tolerance for precise fitment\u003c\/li\u003e\n\u003cli\u003eSolid carbide construction in the Tuffy material grade for toughness in demanding cuts\u003c\/li\u003e\n\u003cli\u003e4-flute spiral design with a 30-degree helix angle for smooth chip flow and surface finish\u003c\/li\u003e\n\u003cli\u003eCentercutting geometry supports direct plunge entry into workpiece material\u003c\/li\u003e\n\u003cli\u003eRight-hand cut and right-hand flute direction compatible with standard mill spindle rotation\u003c\/li\u003e\n\u003cli\u003eStub length at 2-1\/2 inch OAL provides added rigidity and reduced deflection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard replacement or direct-use solid carbide square end mill for CNC machining centers and manual mills accepting a 3\/8 inch straight cylindrical shank. Part of the ROBBJACK T12-403 series.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified machinist or CNC operator. Ensure the machine spindle is fully stopped and the tool is secured in a clean, properly sized collet or end mill holder before tightening. Verify runout with a dial indicator before engaging the cut. Follow shop safety protocols and machine manufacturer guidelines for spindle speeds and feed rates appropriate to the workpiece material.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter\u003c\/strong\u003e: 0.250 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 0.3125 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.375 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnd Mill Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: Tuffy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHelix Angle\u003c\/strong\u003e: 30 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Spiral\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\u003eFlute Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentercutting\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength Type\u003c\/strong\u003e: Stub\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter Tolerance\u003c\/strong\u003e: plus 0.001 \/ minus 0.000 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter Tolerance\u003c\/strong\u003e: minus 0.0001 \/ minus 0.0002 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length Tolerance\u003c\/strong\u003e: plus 0.060 \/ minus 0.060 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.125 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: T12-403\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: ROBBJACK\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: T12-403-08\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ROBBJACK","offers":[{"title":"Default Title","offer_id":51972399563058,"sku":"T12-403-08","price":123.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/8a1adbc6e07e2e0a5c895be993822866_694e31b1-e66f-4834-aa69-a0014bf2ecba.jpg?v=1789967587","url":"https:\/\/voomisupply.com\/products\/robbjack-t12-403-08-square-end-mill-1-4-in-4-flute-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}