Kennametal 1542893 Hand Tap 5/8-11 Unc Bottoming Hss

Product Description

The KENNAMETAL 1542893 is a 5/8-11 UNC bottoming hand tap designed for threading operations in cast iron and non-ferrous metals. Manufactured from high-speed steel with a bright uncoated finish, this right-hand tap features four straight flutes and a bottoming chamfer for cutting threads to the bottom of a blind hole. Overall length is 3.81 inches with a thread length of 1.813 inches and a shank diameter of 0.48 inches. It carries a Class 3B fit and H3 thread limit, making it suited for close-tolerance threading work in production and maintenance environments. Licensed machinists and tool-and-die professionals are the primary users.

This tap is intended for hand tapping applications in materials such as cast iron and non-ferrous metals. The bottoming chamfer allows threads to be cut as close as possible to the bottom of a blind hole, which is the critical requirement in many precision machining setups. It is a standard UNC 5/8-11 configuration, fitting common threading tasks across manufacturing, MRO, and repair operations. The Series 5305 and 5303 designation covers both standard and related variants in the KENNAMETAL tap lineup.

Key Features

• Bottoming chamfer for threading to the bottom of blind holes
• High-speed steel construction for durability across cast iron and non-ferrous metals
• Four straight flutes for efficient chip evacuation in through and blind hole applications
• Bright uncoated finish — no coating to chip or delaminate during service
• Class 3B fit with H3 thread limit for close-tolerance applications
• Right-hand thread direction, standard UNC 5/8-11 configuration

Compatibility

Designed as an OEM-style hand tap for 5/8-11 UNC threading operations in cast iron and non-ferrous metal workpieces. Compatible with Series 5305 and 5303 applications per KENNAMETAL specifications.

Installation Notes

Hand tap installation should be performed by a qualified machinist or tradesperson using an appropriate tap wrench sized for the shank diameter. Always ensure the workpiece is securely fixtured and apply cutting fluid rated for the workpiece material before tapping. Back the tap out periodically to clear chips and prevent binding, especially in blind holes. Do not apply excessive torque, as high-speed steel taps can fracture if forced against an obstruction.