Value Collection MSC-04489613 Straight Flute Tap 1-1/2-6 Unc

Product Description

The VALUE COLLECTION MSC-04489613 is a straight flute bottoming tap designed for cutting internal threads in pre-drilled holes where a full thread must be formed close to the bottom of a blind hole. Manufactured from high-speed steel with a bright uncoated finish, this tap cuts a 1-1/2-6 UNC right-hand thread to a 3B class of fit with an H4 thread limit. It features 4 flutes and a 3-inch thread length with an overall length of 6.375 inches. Machinists and toolroom technicians use this tap in manual or machine tapping operations on steel, cast iron, aluminum, and similar machinable materials.

This tap is suited for production and maintenance machining environments requiring a coarse unified thread in larger-diameter workpieces. Its bottoming chamfer — typically 1 to 2 thread leads — allows threading to the bottom of a blind hole, making it the final tap in a tapping sequence when full thread depth is required. It is appropriate for use in machine shops, repair facilities, and industrial manufacturing settings working with 1-1/2-inch coarse-thread fastener specifications.

Key Features

• 1-1/2-6 UNC thread form, right-hand cut, for coarse unified threads in larger-diameter applications
• Bottoming chamfer for threading to the bottom of blind holes
• 3B class of fit with H4 thread limit for standard tolerance internal threads
• 4 straight flutes for chip clearance in through and shallow blind-hole applications
• High-speed steel construction provides durability across a range of machinable metals
• Bright uncoated finish — suitable for use with cutting fluids on ferrous and non-ferrous materials

Compatibility

Designed as an OEM-style replacement or standard tooling selection for any application requiring a 1-1/2-6 UNC bottoming tap with a 3B class of fit.

Installation Notes

This tap is installed by machinists using a tap wrench, tapping head, or CNC rigid-tapping setup. Always ensure the pilot hole is drilled to the correct tap drill diameter for a 1-1/2-6 UNC thread before tapping. Use appropriate cutting fluid for the workpiece material to extend tool life and improve thread quality. When tapping blind holes, clear chips frequently to prevent tap breakage.