Hertel R837650K Nut Tap 1/2-20 Unf 4 Flute Hss

Product Description

The HERTEL R837650K is a straight-flute nut tap designed for cutting 1/2-20 UNF internal threads in through-hole applications. Manufactured from high-speed steel with a chrome finish, this tap delivers consistent thread geometry across high-volume production and maintenance work. It features 4 flutes and carries an H3 thread limit, which supports standard tolerance fits for 1/2-20 UNF fastener assemblies. Overall length is 7 inches, with a thread length of 1.875 inches. Machinists, tool-and-die technicians, and maintenance mechanics use nut taps in production tapping operations where nuts or thin workpieces are threaded continuously and the tap passes fully through the part.

This tap is suited for threading operations on ferrous and non-ferrous materials in both shop and field maintenance settings. Its 7-inch overall length allows the finished nut to clear the shank during continuous tapping, reducing interruptions in production runs. Typical applications include threading hex nuts, coupling nuts, and other thin fastener stock. The chrome finish provides surface hardness and lubricity, helping to reduce friction and chip adhesion during cutting.

Key Features

• 1/2-20 UNF thread form for fine-pitch unified national fastener applications
• H3 thread limit for controlled tolerance fits
• 4-flute geometry supports chip clearance in through-hole tapping
• High-speed steel construction withstands heat generated in production tapping
• Chrome finish reduces friction and resists chip buildup on cutting edges
• 7-inch overall length allows finished nuts to clear the shank during tapping cycles

Compatibility

Designed as a standard nut tap for 1/2-20 UNF thread applications. Compatible with tapping heads, CNC tapping attachments, and manual tap handles configured for straight-shank taps.

Installation Notes

Nut taps are installed and operated by machinists or maintenance mechanics using appropriate tapping equipment. Always secure the workpiece before beginning the tapping cycle and use a cutting fluid compatible with the workpiece material to extend tap life. Inspect the tap for chipping or wear before each use. Do not force a tap that has stopped advancing, as this may indicate chip packing or tap binding that can cause breakage.