{"product_id":"value-collection-557u-4-taper-pin-reamer-size-4-hss","title":"Value Collection 557u 4 Taper Pin Reamer Size 4 Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION 557u 4 is a Size 4 taper pin reamer designed for hole enlarging, hole finishing, and hole shaping operations in precision machining and tool-and-die work. Constructed from high speed steel (HSS) with a bright\/uncoated finish, this reamer features a left-hand spiral flute with right-hand cutting action, which helps pull chips away from the cutting zone during use. The small end diameter is 0.2071 inches and the large end diameter is 0.2604 inches, with a taper rate of 1:48. Overall length is 4.0625 inches with a flute length of 2.5625 inches. A square shank with a diameter of 0.2656 inches provides positive drive in a standard tap wrench or machine holder.\u003c\/p\u003e\n\u003cp\u003eThis reamer is suited for general-purpose use in job shops, toolrooms, and maintenance environments where taper pin holes must be sized or finished to accept standard Size 4 taper pins. Typical applications include fitting taper pins in shaft collars, gears, and mechanical assemblies where precise alignment and secure retention are required. The 1:48 taper conforms to the standard taper pin series, making it appropriate for both new hole preparation and rework of existing taper pin bores.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSize 4 taper pin geometry with a 1:48 taper rate for standard taper pin fitment\u003c\/li\u003e\n  \u003cli\u003eHigh speed steel construction provides durability across a range of workpiece materials\u003c\/li\u003e\n  \u003cli\u003eLeft-hand spiral flute with right-hand cut promotes chip evacuation and smooth finish\u003c\/li\u003e\n  \u003cli\u003eBright\/uncoated finish suitable for general-purpose machining applications\u003c\/li\u003e\n  \u003cli\u003eSquare shank (0.2656 inches diameter) for positive drive in tap wrenches and machine spindles\u003c\/li\u003e\n  \u003cli\u003e4.0625-inch overall length with 2.5625-inch flute length for adequate reach in typical assemblies\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a general-purpose replacement and standard-use reamer for Size 4 taper pin applications conforming to the 1:48 taper pin series.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eTaper pin reamers are typically operated by machinists or maintenance technicians using a tap wrench for hand reaming or a drill press and milling machine for machine reaming. Secure the workpiece fully before reaming and apply cutting fluid appropriate for the workpiece material to extend tool life and improve surface finish. Advance the reamer gradually, clearing chips frequently, and avoid applying side pressure that could cause taper misalignment. Always verify fit with the actual taper pin before final assembly.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTaper Pin Size\u003c\/strong\u003e: 4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSmall End Diameter\u003c\/strong\u003e: 0.2071 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLarge End Diameter\u003c\/strong\u003e: 0.2604 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTaper Rate\u003c\/strong\u003e: 1:48\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 2.5625 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 4.0625 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.2656 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Square\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\u003eTool Material\u003c\/strong\u003e: High Speed Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Bright\/Uncoated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 557U\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: VALUE COLLECTION\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 557u 4\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51693877788978,"sku":"557u 4","price":102.86,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/701e7bece35ed2fba75b3e08237755ff.jpg?v=1788318437","url":"https:\/\/voomisupply.com\/products\/value-collection-557u-4-taper-pin-reamer-size-4-hss","provider":"Voomi Supply","version":"1.0","type":"link"}