Value Collection MSC-04910220 Straight Flute Tap 1/4-20

Product Description

The VALUE COLLECTION MSC-04910220 is a straight flute tap designed for cutting 1/4-20 UNC internal threads in a left-hand direction. Built from high-speed steel with a bright uncoated finish, this tap delivers consistent thread formation in a range of materials encountered in general machining and maintenance work. The taper chamfer eases entry into the workpiece and progressively distributes cutting load across the leading threads. With an H3 thread limit and a 3B class of fit, this tap produces threads that meet standard tolerance requirements for most mechanical assemblies. Machinists, maintenance technicians, and tool-and-die professionals are the primary users.

This tap suits applications where left-hand threads are required, such as counterclockwise-rotating shaft components, left-side wheel studs, or specialized fastener assemblies. The 1-inch thread length accommodates standard through-hole and shallow blind-hole applications in the 1/4-20 UNC size. It is appropriate for use in manual tapping handles or low-speed machine tapping setups where coolant-through tooling is not required.

Key Features

• Left-hand thread direction for counterclockwise thread applications
• Taper chamfer distributes cutting load for easier thread starting
• H3 thread limit provides controlled oversize tolerance for 3B class of fit
• 4 straight flutes for chip clearance in through-hole and open-chip environments
• High-speed steel construction for durability across common workpiece materials
• Bright uncoated finish suitable for use with cutting oils and standard tapping fluids

Compatibility

Designed as a standard replacement or supplemental tap for 1/4-20 UNC left-hand thread applications requiring a 3B class of fit and H3 thread limit in manual or low-speed machine tapping setups.

Installation Notes

Always secure the workpiece firmly before tapping and ensure the tap is aligned perpendicular to the hole to avoid thread distortion or tap breakage. Power down any machine spindle and verify zero rotation before changing or seating tooling. Apply an appropriate cutting fluid throughout the tapping operation to reduce heat buildup and extend tap life. Left-hand taps must be rotated counterclockwise to cut — confirm thread direction before beginning work.