Hertel R127905K Pipe Tap 1-1/4 11-1/2 Npt 5 Flute Hss

Product Description

The HERTEL R127905K is an interrupted thread pipe tap designed to cut 1-1/4 inch to 11-1/2 NPT internal pipe threads in metal workpieces. It is manufactured from high speed steel with a chrome plated finish that improves lubricity and chip evacuation during the tapping operation. The 5-flute interrupted thread design reduces cutting torque, lowers heat buildup, and helps break chips in tough or gummy materials. At 4 inches overall length with a 1.3125-inch shank diameter, this tap is sized for use in larger pipe thread applications where a rigid setup and proper tapping lubricant are essential. Machinists, pipefitters, and maintenance professionals working with 1-1/4 inch NPT fittings reach for this tap when threading steel, cast iron, or similar ferrous stock.

This tap is used wherever 1-1/4 inch NPT internal pipe threads must be cut or reconditioned in a shop or field environment. Typical applications include threading steel pipe flanges, manifolds, valve bodies, and pipe end fittings. The interrupted thread geometry makes it particularly well suited for through-hole tapping in materials that produce long, stringy chips. It performs in both manual tapping setups and machine tapping operations when used with a suitable tapping attachment and cutting fluid. Plumbers, pipefitters, and industrial maintenance technicians are the primary installers of this tool.

Key Features

• Interrupted thread geometry reduces cutting torque and breaks chips during through-hole tapping
• 5-flute configuration provides increased thread contact and cutting stability in larger pipe sizes
• Chrome plated finish improves surface lubricity and reduces built-up edge on the cutting faces
• High speed steel construction maintains hardness and edge retention at elevated cutting temperatures
• Regular hook geometry suits general-purpose ferrous and non-ferrous tapping applications
• 1.3125-inch shank diameter and 0.9840-inch square size accommodate standard large-tap holding equipment

Compatibility

Designed for cutting 1-1/4 inch to 11-1/2 NPT internal pipe threads in accordance with the NPT thread standard. Compatible with tapping handles, drill press tapping attachments, and CNC or manual tapping machines equipped to accept a 1.3125-inch shank diameter.

Installation Notes

This tap should be used by qualified machinists or pipefitters familiar with proper tapping procedures. Always secure the workpiece firmly and align the tap perpendicular to the drilled hole before beginning the cut. Apply a suitable cutting fluid throughout the operation to reduce heat and extend tool life. Back the tap off periodically to break and clear chips, and never force a tap that has seized — back it out immediately to avoid breakage.