Kennametal 5705422 Spiral Flute Tap 3/8-24 Unf Plug 3B

Product Description

The KENNAMETAL 5705422 is a spiral flute tap designed for threading 3/8-24 UNF internal threads in high-temperature alloys and nickel alloys. Built from powdered metal vanadium high speed steel and finished with an AlCrTiN coating, it handles the demanding cutting conditions those materials require. The plug chamfer provides a standard lead-in for through-hole and deeper blind-hole applications. With 3 left-hand spiral flutes at a 10-degree helix angle, the tool evacuates chips upward out of the hole — a key performance factor when working in gummy, work-hardening materials. Thread limit is H3 and class of fit is 3B.

This tap is suited for machining and production environments where high-temp alloy components require precise internal threads. Typical applications include aerospace, power generation, and industrial manufacturing where nickel-based alloys, Inconel, and similar S-grade materials are common. The AlCrTiN coating improves heat resistance and tool life at elevated cutting temperatures. The T690 series is engineered specifically for difficult-to-machine materials where standard HSS taps fail prematurely. Installation is performed on CNC machining centers or manual tapping fixtures. No coolant-through capability — external or flood coolant is the appropriate delivery method for this tool.

Key Features

• 3/8-24 UNF right-hand thread, 3B class of fit, H3 thread limit
• AlCrTiN coating for elevated heat and wear resistance in high-temp alloy cutting
• Left-hand spiral flutes with 10-degree helix angle for upward chip evacuation
• Plug chamfer for versatile through-hole and blind-hole threading
• Powdered metal vanadium high speed steel substrate for toughness and edge retention
• T690 series — engineered for primary workpiece material code S (high-temp and nickel alloys)

Compatibility

Designed for threading high-temperature alloys and nickel alloys (workpiece material code S). Fits standard 3/8-inch tap holders and collet chucks accepting a 0.381-inch shank diameter. No coolant-through adapter is required or applicable.

Installation Notes

Installation is performed by a machinist or toolroom technician on a CNC machining center, drill press, or dedicated tapping machine. Ensure the spindle and workpiece are fully secured before engaging the tap. Use appropriate flood or external coolant — this tool does not support coolant-through delivery. Inspect the tap for wear or chipping before each use; work-hardening alloys accelerate edge degradation if feeds and speeds are not optimized for the material.