Value Collection 556U 4 Taper Pin Reamer Size 4 Hss

Product Description

The VALUE COLLECTION 556U 4 is a straight-flute taper pin reamer designed to enlarge, finish, and shape tapered holes to accept standard number 4 taper pins. Manufactured from high-speed steel with a bright, uncoated finish, it delivers reliable cutting performance in general-purpose machining applications. The reamer features a 0.2071-inch small end diameter tapering to a 0.2604-inch large end diameter at a 1:48 taper rate, with a 2.5625-inch flute length and a 4.0625-inch overall length. The square shank measures 0.2656 inches in diameter for positive drive in a matching holder. Right-hand cutting direction is standard.

This reamer is suited for machine shops, toolrooms, and maintenance operations where taper pin holes must be accurately sized or reconditioned. It handles hole enlarging, hole finishing, and hole shaping tasks in ferrous and non-ferrous metals. The general-purpose rating makes it appropriate for both production runs and one-off repair work. Machinists and tool-and-die tradespeople install and use this reamer with drill presses, milling machines, or manually operated tap wrenches when precise taper pin fit is required.

Key Features

• Number 4 taper pin size with a 1:48 taper rate for consistent, repeatable fitment
• High-speed steel construction provides durability across a wide range of workpiece materials
• Straight flute geometry suited for general-purpose hole finishing and shaping
• Bright, uncoated finish allows easy inspection of cutting edge condition
• Square shank design ensures positive drive and prevents slippage in the holder
• Right-hand cutting direction compatible with standard machine spindle rotation

Compatibility

Designed as a general-purpose replacement or addition for toolroom and machining setups requiring a standard number 4 taper pin reamer with a 1:48 taper rate and straight flute geometry.

Installation Notes

Secure the square shank firmly in a compatible tap wrench, drill press chuck, or machine spindle holder before use. Always clamp the workpiece securely and apply appropriate cutting fluid to extend tool life and improve finish quality. Advance the reamer slowly and evenly to avoid chatter or oversizing the tapered bore. Inspect cutting edges before each use and remove any chips or debris from the flutes between passes.