Value Collection SM25N40 Taper Pin Reamer 4/0 Hss

Product Description

The VALUE COLLECTION SM25N40 is a taper pin reamer designed for hole enlarging, hole finishing, and hole shaping operations on taper pin bores. Built from high-speed steel (HSS) with a bright, uncoated finish, this reamer features a spiral flute with left-hand spiral direction and right-hand cutting direction. The small end diameter is 0.0869 inches and the large end diameter is 0.1142 inches, sized for a 4/0 taper pin. The taper rate is 1:48. Machinists and toolroom professionals use this reamer to prepare or refine taper pin holes to precise dimensional tolerances in general-purpose metalworking applications.

This reamer is suited for general-purpose machine shop and maintenance work where taper pin holes must be cut or finished to match 4/0 taper pin specifications. It fits standard straight-shank tool holders and drill presses, milling machines, or lathes. The 1.3125-inch flute length and 2.3125-inch overall length make it appropriate for shallow-to-moderate depth taper pin bore work in both production and maintenance-repair environments.

Key Features

• High-speed steel construction for general-purpose metalworking durability
• Spiral flute geometry with left-hand spiral and right-hand cut for smooth chip evacuation
• Small end diameter of 0.0869 inches and large end diameter of 0.1142 inches for 4/0 taper pin sizing
• 1:48 taper rate for accurate taper pin bore finishing
• Bright, uncoated finish suitable for a wide range of workpiece materials
• Straight shank at 0.125 inches diameter fits standard collets and chucks

Compatibility

Designed as a general-purpose replacement and standard-fit taper pin reamer for 4/0 taper pin applications in straight-shank tool holders across drill presses, lathes, and milling machines.

Installation Notes

This tool is installed by a machinist or toolroom technician into a compatible straight-shank collet or drill chuck. Ensure the machine spindle is fully stopped and the workpiece is securely clamped before tool engagement. Use appropriate cutting fluid for the workpiece material to extend tool life and achieve the intended surface finish. Follow shop safety protocols and applicable machine guarding requirements when operating rotating cutting tools.