Value Collection 557U 8 Taper Pin Reamer Size 8 Hss

Product Description

The VALUE COLLECTION 557U 8 is a size 8 taper pin reamer designed for hole enlarging, hole finishing, and hole shaping operations in metal fabrication and mechanical assembly work. Built from high-speed steel with a bright, uncoated finish, this reamer features a spiral flute geometry with left-hand spiral direction and right-hand cutting action. The small end diameter measures 0.3971 inches and the large end measures 0.5050 inches, following a 1:48 taper rate. With a 7/16-inch square shank, this tool seats securely in standard tap wrenches and reamer holders. Machinists and tool-and-die professionals reach for this style of reamer when fitting taper pins in hubs, shafts, and mechanical joints.

This taper pin reamer is suited for general-purpose use in job shop, maintenance, and production environments. Typical applications include enlarging and finishing tapered holes to accept standard size 8 taper pins in mechanical assemblies such as shaft collars, couplings, and linkage components. The 1:48 taper rate conforms to standard taper pin geometry, making this reamer appropriate wherever a properly fitted, removable taper pin connection is required.

Key Features

• High-speed steel construction for general-purpose reaming in a range of workpiece materials
• Size 8 taper pin geometry with 1:48 taper rate and 0.3971-inch small end to 0.5050-inch large end
• Spiral flute design with left-hand spiral and right-hand cut for smooth chip evacuation
• 7/16-inch square shank for positive drive in standard tap wrenches and holders
• Bright, uncoated finish suitable for use with cutting fluid in standard shop conditions
• 5.1875-inch flute length provides ample cutting surface for through-hole and deep-hole applications

Compatibility

Designed as an OEM-style replacement or standard tooling option for size 8 taper pin reaming applications conforming to the 1:48 standard taper pin specification.

Installation Notes

This reamer is installed and operated by machinists and tool-and-die technicians using a standard tap wrench or reamer holder matched to the 7/16-inch square shank. Secure the workpiece before reaming and apply appropriate cutting fluid to extend tool life and improve finish quality. Feed the reamer steadily with consistent hand pressure; do not force or reverse the cutter under load. Always wear appropriate eye protection and follow shop safety procedures when operating hand reamers.