Value Collection MSC-04489423 Straight Flute Tap 1-1/4-7 Unc

Product Description

The VALUE COLLECTION MSC-04489423 is a straight flute tap designed for cutting 1-1/4-7 UNC internal threads in a range of workpiece materials. Built from high-speed steel with a bright, uncoated finish, this tap delivers reliable thread-cutting performance in production and maintenance machining environments. The taper chamfer eases entry into the hole and progressively engages the work material, reducing the torque required to start the cut. With four flutes and an H4 thread limit, it is suited for threading through-holes where chip clearance is managed by the straight flute geometry. Installation is performed by machinists and toolroom technicians using standard tapping heads, drill presses, or CNC machining centers.

This tap is used in general metalworking, manufacturing, and maintenance-repair-overhaul applications where 1-1/4-7 UNC coarse-thread fastener holes are required. The taper chamfer style makes it particularly appropriate for through-hole applications or as a starting tap in blind-hole sequences. The 3B class of fit produces standard tolerance internal threads compatible with 3A class external fasteners, meeting typical commercial and industrial assembly requirements.

Key Features

• 1-1/4-7 UNC coarse thread form with right-hand thread direction
• Taper chamfer for progressive thread engagement and reduced starting torque
• High-speed steel construction provides toughness across a broad range of workpiece materials
• Bright uncoated finish suitable for use with cutting fluid or tapping compound
• H4 thread limit for standard 3B class of fit internal threads
• Four straight flutes support chip evacuation in through-hole applications

Compatibility

Designed as a standard replacement or stocking tap for any application requiring 1-1/4-7 UNC taper taps with a 3B class of fit in high-speed steel.

Installation Notes

This tap should be installed and operated by a qualified machinist familiar with tapping speeds, feeds, and cutting fluid selection for the target workpiece material. Ensure the workpiece is securely fixtured and the tap is properly aligned with the pre-drilled pilot hole before engaging. Always apply appropriate cutting fluid or tapping compound to reduce heat and extend tap life. If re-tapping or chasing existing threads, inspect the hole for damage or debris before proceeding.