Hertel G837633 Extension Tap 8-32 Unc 3 Flute Hss

Product Description

The HERTEL G837633 is an extension tap designed for cutting internal 8-32 UNC threads in applications where standard-length taps cannot reach. Built from high-speed steel (HSS) with a bright, uncoated finish, this tap features a plug chamfer for progressive thread engagement and three flutes for chip evacuation. The H3 thread limit provides a controlled tolerance fit for 2B class-of-fit threads, making it suitable for production and maintenance threading operations. At 6 inches overall length, it extends reach into deep bores or recessed features without requiring a tap extension holder. Machinists and maintenance technicians use this tap in manual tapping and low-speed machine tapping setups.

This tap is suited for threading operations in metal fabrication shops, maintenance and repair environments, and production facilities where 8-32 UNC internal threads are required in deep or hard-to-reach workpieces. The reduced shank design allows the tap to be chucked in standard tap wrenches or drill press chucks. The plug chamfer, with its moderate lead-in, works in through-holes and moderately deep blind holes. It is a general-purpose choice for ferrous and non-ferrous materials where HSS performance is appropriate.

Key Features

• 8-32 UNC thread form with H3 thread limit for consistent 2B class-of-fit tolerances
• 6 inch overall length provides extended reach into deep or recessed features
• Three-flute design promotes chip clearance during threading
• Plug chamfer allows progressive thread engagement suitable for through-holes and moderate-depth blind holes
• High-speed steel construction provides toughness for manual and low-speed machine tapping
• Reduced shank diameter compatible with standard tap wrenches and chuck holders

Compatibility

Designed as a standard-fitment extension tap for 8-32 UNC threading applications where a 6 inch overall length is required. Compatible with tap wrenches and machine holders accepting a 0.123 inch shank diameter.

Installation Notes

Extension taps are installed and operated by machinists or maintenance technicians using appropriate tap wrenches or tapping heads. Always ensure the workpiece is securely clamped and the tap is aligned perpendicular to the hole before threading begins. Use a cutting fluid appropriate for the workpiece material to reduce friction and extend tool life. Back the tap out periodically to break and clear chips, particularly in deeper holes.