Value Collection JY4870150 Straight Flute Tap 1-1/4-16 Uns

Product Description

The VALUE COLLECTION JY4870150 is a straight flute tap designed for cutting internal threads in a 1-1/4-16 UNS configuration. Built from high-speed steel with a bright, uncoated finish, this tap delivers reliable thread-cutting performance in ferrous and non-ferrous materials. The bottoming chamfer allows threads to be cut to the bottom of a blind hole, and the 3B class of fit ensures compatibility with standard tolerance assemblies. With six flutes and an H4 thread limit, it is suited for controlled, accurate thread production in machine shop and maintenance environments. Overall length is 4 inches. Installed by machinists, toolroom technicians, and maintenance mechanics.

This tap is used in applications requiring a 1-1/4-16 UNS right-hand thread in a blind-hole configuration where full thread depth to the bottom of the bore is required. The bottoming chamfer design makes it the final tap used in a three-tap sequence, following a taper and plug tap in harder materials, or used alone in pre-tapped or through-drilled setups. Typical applications include heavy equipment repair, tooling fixtures, and industrial machinery maintenance where UNS thread forms are specified.

Key Features

• Bottoming chamfer allows threading to the bottom of blind holes
• Six flutes provide chip clearance and consistent thread form
• High-speed steel construction for durability across a range of workpiece materials
• Bright uncoated finish suitable for use with standard cutting fluids
• H4 thread limit for controlled fit tolerance
• 3B class of fit meets standard internal thread tolerance requirements

Compatibility

Designed for cutting 1-1/4-16 UNS right-hand internal threads in blind-hole applications requiring a bottoming tap with a 3B class of fit and H4 thread limit.

Installation Notes

Installed by machinists and maintenance technicians using a tap wrench, tapping head, or CNC rigid tapping setup. Always ensure the workpiece is properly secured and the correct tap drill size for a 1-1/4-16 UNS thread is used before tapping. Apply an appropriate cutting fluid to reduce heat and extend tool life. For blind holes, clear chips periodically by reversing the tap to prevent chip packing and tap breakage.