Value Collection JY4910287 Straight Flute Tap 1/4-28 Unf

Product Description

The VALUE COLLECTION JY4910287 is a straight flute tap designed to cut 1/4-28 UNF internal threads in a left-hand direction. Built from high-speed steel with a bright/uncoated finish, it features four flutes and a plug chamfer for standard through-hole and blind-hole threading operations. The H3 thread limit keeps the finished thread within 3B class of fit tolerances, making it suitable for general-purpose fastener applications where a reliable thread form is required. Overall length is 2.5 inches. Machinists, tool and die makers, and maintenance technicians use this tap in manual tap handles or low-speed machine setups.

This tap is intended for use in metalworking and maintenance environments where left-hand threaded fasteners must be cut or repaired. Typical applications include threading steel, aluminum, and other machinable materials to accept left-hand 1/4-28 UNF fasteners. The plug chamfer style requires a pre-drilled hole of the correct tap drill size and is suited for both through-hole threading and starting threads in a blind hole before finishing with a bottoming tap.

Key Features

• Left-hand thread direction for applications requiring reverse-thread fasteners
• 1/4-28 UNF thread form with 3B class of fit tolerance
• H3 thread limit for consistent fit with standard UNF fasteners
• Plug chamfer style for general through-hole and blind-hole use
• High-speed steel construction provides durability across a range of machinable metals
• Bright/uncoated finish with no coolant-through feature — suitable for hand tapping and light machine use

Compatibility

Designed as a standard replacement or supplemental tap for 1/4-28 UNF left-hand thread applications in manual tap handles and compatible low-speed tapping machines accepting straight-shank taps.

Installation Notes

A licensed machinist or experienced technician should verify the correct tap drill diameter before use to achieve proper thread engagement. Power down any machine tool completely before mounting or removing the tap. Use appropriate cutting fluid for the workpiece material to extend tap life and improve thread quality. Left-hand taps must be turned counterclockwise to cut — confirm thread direction before beginning to avoid workpiece damage.