Value Collection JY9039934 Straight Flute Tap 1-1/4-27 Uns

Product Description

The VALUE COLLECTION JY9039934 is a straight flute tap designed for cutting internal threads in materials where chip evacuation through the flute is manageable and controlled feed is practical. Configured in a 1-1/4-27 UNS thread form with a 6-flute geometry, this tap delivers a smooth cutting action suited to ferrous and non-ferrous metals. The bottoming chamfer style allows threading close to the bottom of a blind hole, making it the appropriate choice when full thread depth near the hole base is required. Manufactured from high-speed steel with a bright uncoated finish, it is a standard toolroom tap for machinists and maintenance technicians working to UNS thread specifications.

This tap is used in machining, maintenance, and repair operations where a 1-1/4-27 UNS thread form is specified. The bottoming chamfer is particularly suited to blind-hole applications in production and job-shop environments. The 3B class of fit designates a standard tolerance range for general-purpose internal thread engagement. Right-hand thread direction is standard for the majority of threaded fastener applications. The H4 thread limit indicates the ground-thread oversize allowance, providing guidance for pairing with the correct tap drill and achieving the desired fit with mating hardware.

Key Features

• 1-1/4-27 UNS thread form for specialized unified national special pitch applications
• 6-flute design provides more cutting edges and smoother finish per revolution compared to fewer-flute taps
• Bottoming chamfer allows threading to within 1-2 threads of blind hole bottom
• 3B class of fit meets standard tolerance requirements for general internal thread engagement
• H4 thread limit specifies controlled oversize for consistent fit with mating components
• High-speed steel construction provides durability across a range of workpiece materials

Compatibility

Designed as an OEM-style replacement or direct toolroom tap for applications requiring a 1-1/4-27 UNS internal thread with a 3B class of fit and H4 thread limit.

Installation Notes

This tap is installed by machinists and maintenance technicians using a tap wrench, tapping head, or CNC tapping cycle with appropriate speed and feed for the workpiece material. Always use cutting fluid or tapping compound to extend tool life and improve thread finish. Ensure the tap is properly aligned with the drilled hole before applying torque to prevent tap breakage or thread damage. Select the correct tap drill diameter for the desired thread engagement percentage before beginning the tapping operation.