Value Collection MSC-04910303 Straight Flute Tap 1/4-28 Unf

Product Description

The VALUE COLLECTION MSC-04910303 is a straight flute tap designed to cut internal left-hand threads in metalworking and machining applications. Built from high-speed steel with a bright/uncoated finish, it produces a 1/4-28 UNF thread form to a 3B class of fit with an H3 thread limit. The taper chamfer — typically 7 to 10 threads — eases entry and makes this tap a practical choice for through-hole threading operations. With a 1 inch thread length and a 2.5 inch overall length, it fits standard tap handles and machine tool holders used in shop and field environments. Machinists, tool and die technicians, and maintenance mechanics are the primary users.

This tap is suited for threading operations in steel, aluminum, cast iron, and similar materials where a left-hand thread form is required. Left-hand taps are commonly specified for applications where standard right-hand thread rotation would loosen a fastener under working loads, such as certain spindle assemblies, turnbuckles, and mechanical linkages. The 1/4-28 UNF designation makes it appropriate for fine-pitch thread work in both production and repair settings across industrial, automotive, and general maintenance environments.

Key Features

• Left-hand thread direction for applications requiring reverse thread orientation
• 1/4-28 UNF thread form with 3B class of fit for standard tolerance internal threads
• H3 thread limit for consistent fit with plated or coated fasteners
• Taper chamfer for guided entry and reduced starting torque in through-hole applications
• High-speed steel construction for durability across common ferrous and non-ferrous materials
• Bright/uncoated finish with no coolant-through requirement, compatible with standard cutting fluids

Compatibility

Designed as an OEM-style replacement or standard-stock straight flute tap for use in any tap handle, T-handle, or machine tapping setup that accepts a 1/4-28 UNF left-hand tap with standard shank dimensions.

Installation Notes

This tap is installed and operated by machinists and maintenance mechanics using hand tap wrenches, T-handles, or machine tool holders. Always secure the workpiece before tapping and use an appropriate cutting fluid to reduce heat and extend tool life. Back the tap out periodically to clear chips, particularly in blind-hole applications. Inspect the tap for chipping or wear before each use — a damaged tap can seize in the hole and damage the workpiece.