Value Collection 557u 7 Taper Pin Reamer Size 7 Hss

Product Description

The VALUE COLLECTION 557u 7 is a size 7 taper pin reamer designed for hole enlarging, finishing, and shaping operations in metal fabrication and precision machining applications. Built from high-speed steel (HSS), it delivers the hardness and wear resistance needed for consistent performance in general-purpose reaming. The reamer features a spiral flute geometry with a left-hand spiral direction and right-hand cutting direction, which helps pull chips away from the cutting zone and reduces chatter. The small end diameter measures 0.3297 inches and the large end measures 0.422 inches, following a 1:48 taper rate standard for size 7 taper pins.

This taper pin reamer is suited for machine shops, tool rooms, and maintenance environments where taper pin holes must be sized or finished to precise tolerances. It is appropriate for use in manual or CNC-controlled setups where a square shank drive is available. The 4.4375-inch flute length provides adequate cutting surface for through-hole and blind-hole applications within its size range. Machinists and toolroom technicians working on general-purpose hole finishing will find this reamer compatible with standard taper pin sizing conventions.

Key Features

• Size 7 taper pin geometry with a 1:48 taper rate for standard fitment
• High-speed steel construction for durability in general-purpose machining
• Spiral flute, left-hand helix with right-hand cut to control chip evacuation
• Bright/uncoated finish — suitable for use with cutting fluids
• Square shank drive for positive engagement in standard holders
• 4.4375-inch flute length and 6.3125-inch overall length for versatile reach

Compatibility

Designed as an OEM-style replacement or standard tooling option for applications requiring a size 7 taper pin reamer with a 1:48 taper rate and square shank drive.

Installation Notes

Secure the square shank firmly in the appropriate holder or tap wrench before use and ensure the workpiece is clamped to prevent movement during reaming. Apply a suitable cutting fluid for the workpiece material to extend tool life and improve finish quality. Always start with a properly drilled pilot hole sized for the small end diameter before advancing the reamer. Allow the reamer to cut at controlled feed pressure — forcing the tool can cause chatter, deflection, or premature edge wear.