Balax 10804-010 Extension Thread Forming Tap 4-40 Hss

Product Description

The BALAX 10804-010 is an extension thread forming tap designed for cutting 4-40 UNC internal threads in applications where standard-length taps cannot reach. With an overall length of 4 inches and a thread length of 9/16 inches, this tap is built for deep-hole or obstructed-access tapping operations. It is manufactured from high-speed steel with a bright, uncoated finish and carries an H4 thread limit for close-tolerance work. The bottoming chamfer style allows threading to the bottom of blind holes. Machinists and maintenance technicians in HVAC, electrical, and light fabrication use this tap for precision thread forming in ferrous and non-ferrous materials where chip removal is not a concern.

This tap is suited for production and maintenance environments requiring 4-40 UNC threads in recessed or extended-reach locations. The thread forming design displaces material rather than cutting it, producing stronger threads with no chips generated. The right-hand flute direction and bottoming chamfer make it appropriate for blind-hole tapping in sheet metal, aluminum, and similar low-carbon materials. It fits standard tap holders compatible with the 0.1410-inch shank diameter and 0.1100-inch square drive.

Key Features

• Thread forming (chipless) design produces stronger threads and eliminates chip extraction from blind holes
• Bottoming chamfer allows threading to the full depth of blind holes
• 4-inch overall length provides extended reach for deep or obstructed tapping locations
• H4 thread limit for close-tolerance 2B and 3B class of fit applications
• High-speed steel construction for durability across a range of workpiece materials
• Bright, uncoated finish suitable for use with standard tapping fluids

Compatibility

Designed as an OEM-style replacement or direct-use extension tap for applications requiring 4-40 UNC thread forming with a bottoming chamfer and extended reach; fits tap holders accepting a 0.1410-inch shank diameter with a 0.1100-inch square drive.

Installation Notes

Thread forming taps require adequate lubrication with an appropriate tapping fluid for the workpiece material. Power down any associated machinery and secure the workpiece before tapping operations begin. Use a tap holder or CNC tool holder matched to the 0.1410-inch shank to avoid runout. Do not use thread forming taps in cast iron or brittle materials, as these require cutting-style taps.