{"product_id":"hertel-mr34-0858-438-chucking-reamer-0-086-in-solid-carbide","title":"Hertel MR34-0858.438 Chucking Reamer 0.086 in Solid Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL MR34-0858.438 is a solid carbide chucking reamer designed to finish-ream precision holes to a No. 44 wire gauge diameter of 0.0860 inches. Built from solid carbide throughout, it delivers the rigidity and wear resistance needed for tight-tolerance work in hard or abrasive materials. The spiral flute geometry with a left-hand spiral direction promotes smooth chip evacuation while maintaining a right-hand cutting action. With an overall length of 1.9685 inches and an 11 mm flute length, this reamer is sized for close-quarter drilling operations. Machinists and tool-and-die professionals install this tool in CNC machining centers, drill presses, or manual lathes where repeatable hole sizing is critical.\u003c\/p\u003e\u003cp\u003eThis reamer is suited for precision hole finishing in ferrous and non-ferrous metals, plastics, and composites where a No. 44 wire gauge bore is required. The straight shank interfaces directly with standard chuck-style toolholders, making it a straightforward drop-in for production or repair work. Its bright, uncoated finish makes it appropriate for applications where coating buildup could compromise the tight diameter tolerance of 0.0000 to plus 0.0003 mm.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSolid carbide construction for superior hardness and wear resistance in demanding materials\u003c\/li\u003e\n\u003cli\u003eSpiral flute, left-hand helix with right-hand cutting direction for smooth chip flow\u003c\/li\u003e\n\u003cli\u003eNo. 44 wire gauge diameter — 0.0860 inches — with a tolerance of 0.0000 to plus 0.0003 mm\u003c\/li\u003e\n\u003cli\u003eStraight shank for direct chuck mounting without adapters\u003c\/li\u003e\n\u003cli\u003e4-flute design balances chip clearance with surface finish quality\u003c\/li\u003e\n\u003cli\u003eBright, uncoated finish — no risk of coating interference in tight-tolerance bores\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style precision chucking reamer for use in standard straight-shank chuck toolholders on CNC machining centers, drill presses, and manual lathes requiring a No. 44 wire gauge hole finish.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by qualified machinists or tool-and-die technicians. Secure the straight shank fully in a suitable chuck or collet holder before use, and verify runout with a dial indicator to protect the tight diameter tolerance. Power down and lock out the machine spindle before changing or inspecting the reamer. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain surface finish quality.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReamer Diameter (Wire Gauge)\u003c\/strong\u003e: No. 44\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReamer Diameter (Decimal Inch)\u003c\/strong\u003e: 0.0860 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter Tolerance\u003c\/strong\u003e: 0.0000 to plus 0.0003 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 1.9685 inches (50.00 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 11.00 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Spiral\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpiral Direction\u003c\/strong\u003e: Left Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight\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: Bright\/Uncoated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.1 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: MR34-0858.438\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51749449007410,"sku":"MR34-0858.438","price":275.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/9c4f9711592a3a571aff9d902b27f072.jpg?v=1788906232","url":"https:\/\/voomisupply.com\/products\/hertel-mr34-0858-438-chucking-reamer-0-086-in-solid-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}