Value Collection 557u 1 Taper Pin Reamer Size 1 Hss

Product Description

The VALUE COLLECTION 557u 1 is a taper pin reamer designed to enlarge, finish, and shape taper pin holes to precise dimensional tolerances. Built from high speed steel with a bright, uncoated finish, it delivers reliable cutting performance in general-purpose machining applications. The reamer features a spiral flute geometry with a left-hand spiral direction and right-hand cutting direction, a combination that reduces chatter and produces a smoother hole finish. The small end diameter measures 0.1447 inches and the large end measures 0.1798 inches, conforming to the Number 1 taper pin standard at a 1:48 taper rate. A 3/16-inch square shank ensures positive drive in standard machine spindles and holders.

This reamer is suited for machine shops, maintenance departments, and tool rooms performing taper pin hole work on ferrous and non-ferrous workpieces. Typical applications include fitting taper pins in mechanical assemblies such as shaft-to-hub connections, linkages, and fixtures where a precise taper fit is required. The 557u 1 is a general-purpose tool appropriate for use in drill presses, lathes, or manual operation with a tap wrench when working in tighter access conditions.

Key Features

• High speed steel construction for durability across general-purpose machining tasks
• Spiral flute design with left-hand spiral and right-hand cut reduces chatter and improves hole finish
• Number 1 taper pin size with a 1:48 taper rate for standard taper pin fitment
• Small end diameter 0.1447 inches, large end diameter 0.1798 inches
• 3/16-inch square shank provides positive drive and easy holder retention
• Bright, uncoated finish suitable for use with standard cutting fluids

Compatibility

Designed as a standard replacement or stock tooling option for Number 1 taper pin reaming operations where a 1:48 taper rate and high speed steel construction are specified.

Installation Notes

This tool is installed and operated by machinists or tool room personnel. Before use, secure the workpiece firmly and ensure the reamer is properly seated in the spindle or tap wrench to prevent runout. Always apply an appropriate cutting fluid to extend tool life and improve surface finish. Do not force the reamer through the workpiece; feed at a steady, controlled rate to avoid tool deflection or breakage.