Value Collection JY66556648 Straight Flute Tap 3/4-27 Uns

Product Description

The VALUE COLLECTION JY66556648 is a straight flute tap designed to cut internal threads in through-holes and blind holes where a bottoming chamfer is required to thread close to the bottom of a bore. Ground from high-speed steel (HSS) with a bright, uncoated finish, this tap handles a 3/4-27 UNS thread form with a 4-flute configuration and a right-hand thread direction. The H3 thread limit provides consistent tolerance control for a 3B class of fit, making it suitable for precision threading applications in metalworking, maintenance, and production environments. Licensed machinists and tool-and-die technicians are the primary users.

This tap is used in machining operations that require a 3/4-27 UNS thread — a thread form common in pipe fittings, hydraulic components, and specialty fastener applications. The bottoming chamfer (typically 1 to 2 threads of lead) allows threading to within a few threads of the bottom of a blind hole, making it especially useful in repair work and close-tolerance assemblies. It is suited for use in both manual tapping and low-speed machine tapping setups where coolant-through tooling is not required.

Key Features

• Bottoming chamfer for threading close to the bottom of blind holes
• 4-flute straight flute design for stable cutting in short-chipping materials
• High-speed steel construction provides good wear resistance for general machining
• Bright, uncoated finish — no coating buildup risk in tight tolerance bores
• H3 thread limit ensures consistent 3B class of fit
• Right-hand thread direction, no coolant-through required

Compatibility

Designed for cutting 3/4-27 UNS internal threads with a 3B class of fit in standard tapping chucks, tap holders, and manual tap wrenches sized for 3/4-inch shank tooling.

Installation Notes

This tap is installed by a machinist or maintenance technician using a tap wrench, tapping head, or CNC tap holder rated for the shank size. Always secure the workpiece before tapping and ensure the tap is properly aligned to avoid thread damage or tap breakage. Apply appropriate cutting fluid for the material being tapped. When using a bottoming tap, a spiral-point or taper tap should be used first to establish the thread before finishing with this bottoming tap in blind-hole applications.