Value Collection JY4874061 Straight Flute Tap 1-1/2-8 Uns

Product Description

The VALUE COLLECTION JY4874061 is a straight flute tap designed to cut 1-1/2-8 UNS internal threads in a range of workpiece materials. With 6 flutes and a bottoming chamfer, this tap is suited for threading holes that require threads cut close to the bottom of a blind bore. Constructed from high-speed steel (HSS) with a bright/uncoated finish, the JY4874061 offers reliable cutting performance in general machining applications. The H5 thread limit provides the controlled oversize tolerance required for plated or close-tolerance threaded assemblies. Installation is performed by machinists and toolroom technicians using standard tapping equipment.

This tap is used in machine shop, maintenance, and production environments where 1-1/2-8 UNS bottoming threads are required. The straight flute design makes it appropriate for threading short-chipping or brittle materials. With a thread length of 3 inches and an overall length of 6-3/8 inches, the tap fits standard tapping heads and CNC machine spindles configured for large-diameter threading operations. Right-hand thread direction is standard for conventional fastener and fitting assemblies.

Key Features

• Bottoming chamfer allows threading to the bottom of blind holes
• 6-flute design provides even cutting load distribution on large-diameter threads
• High-speed steel construction supports use across a wide range of workpiece materials
• H5 thread limit maintains controlled oversize tolerance for close-fit threaded assemblies
• Bright/uncoated finish for general-purpose tapping without coating compatibility concerns
• No coolant-through design — compatible with flood or manual lubrication setups

Compatibility

Designed as a general-purpose straight flute tap for 1-1/2-8 UNS right-hand threaded applications in standard tapping heads, drill press setups, and CNC machining centers capable of accommodating the 6-3/8-inch overall length.

Installation Notes

This tap is installed and operated by machinists using appropriate tapping heads, tapping attachments, or CNC rigid-tap cycles. Always ensure the workpiece is securely fixtured and the spindle speed is set to a value appropriate for the workpiece material and tap diameter before beginning the threading operation. Apply cutting fluid or tapping oil to reduce heat and extend tool life. Do not force a bottoming tap into a hole without first clearing chips, as chip packing in blind bores can cause tap breakage.