Kennametal 4131385 Hand Tap 1/4-20 Unc Plug 4-flute Hss

Product Description

The KENNAMETAL 4131385 is a 1/4-20 UNC straight flute hand tap designed for cutting internal threads in a range of ferrous materials. Built from high-speed steel with an oxide finish, this plug chamfer tap is suited for through-hole and blind-hole tapping where a gradual thread entry is required. It features 4 flutes for chip clearance and runs in a right-hand thread direction with a Class 3B fit tolerance at an H3 thread limit. Overall length is 2.5 inches with a 1 inch thread length. Licensed machinists, tool and die makers, and maintenance technicians use this tap for hand or machine tapping operations.

This tap is intended for use in cast iron, ductile iron, and steel workpieces. The plug chamfer configuration — typically 3 to 5 chamfered threads — makes it a general-purpose choice for starting in a pre-drilled hole and completing a full thread form. It fits standard tap wrenches and is appropriate for both production and maintenance tapping at 1/4-20 UNC specifications. The Series 5303S and 5305S designation identifies its place within the KENNAMETAL hand tap line.

Key Features

• 1/4-20 UNC right-hand thread, Class 3B fit at H3 thread limit
• Plug chamfer for general-purpose through-hole and blind-hole tapping
• High-speed steel construction with oxide surface finish for wear resistance
• 4-flute straight flute geometry for efficient chip evacuation
• 2.5 inch overall length with 1 inch thread length and 0.255 inch shank diameter
• Rated for cast iron, ductile iron, and steel material applications

Compatibility

Designed for use in cast iron, ductile iron, and steel. Compatible with standard 1/4-20 UNC tap wrench and machine tap holder setups. Part of the KENNAMETAL Series 5303S and 5305S hand tap family.

Installation Notes

Use appropriate cutting fluid for the workpiece material before tapping to reduce friction and extend tool life. Ensure the starter hole is drilled to the correct tap drill diameter for 1/4-20 UNC before beginning. Secure the workpiece fully before applying torque through the tap wrench. Back off periodically during tapping to break chips and prevent tap binding or breakage.