Value Collection JY9039728 Straight Flute Tap 3/4-20 Unef

Product Description

The VALUE COLLECTION JY9039728 is a straight flute tap designed to cut 3/4-20 UNEF internal threads in a left-hand direction. Manufactured from high-speed steel (HSS) with a bright, uncoated finish, this tap is built for thread-cutting applications where dimensional accuracy and tool durability are required. The plug chamfer style provides a gradual lead-in with moderate starting ease, making it suitable for through-hole and moderately deep blind-hole threading. With 4 flutes and an H3 thread limit, it is appropriate for use in a range of materials where standard tolerance threading is specified. Machinists and toolroom professionals are the primary users of this tap.

This tap is intended for use in metalworking and machining environments where 3/4-20 UNEF left-hand threads are required. Left-hand taps are used in applications where counter-rotation or left-hand fastener assemblies are specified, such as in tooling, fixtures, or mechanical assemblies that require reverse-thread engagement. The 2-inch thread length and 4-1/4-inch overall length suit standard machine tap holders and tapping arms in shop environments.

Key Features

• 3/4-20 UNEF thread size with left-hand thread direction for reverse-thread applications
• High-speed steel construction for durability in general metalworking
• Plug chamfer with 3 to 5 thread lead-in for balanced starting and cutting performance
• 4-flute design for efficient chip clearance in through-hole threading
• H3 thread limit for standard tolerance class fits
• Bright/uncoated finish suitable for use with cutting fluid in a variety of workpiece materials

Compatibility

Designed as a standard straight flute machine tap compatible with 3/4-inch tap holders, tapping heads, and tapping arms configured for UNEF left-hand thread cutting operations.

Installation Notes

Installation and use of this tap should be performed by qualified machinists using appropriate tapping fluid or cutting oil to extend tool life and improve thread quality. Ensure the workpiece is securely fixtured and the tap is properly aligned before engagement to avoid tap breakage. Always confirm the tap holder and spindle are configured for left-hand rotation before use. Follow applicable shop safety procedures when operating tapping equipment.