Value Collection MSC-04916201 Straight Flute Tap 5/8-18 Unf

Product Description

The VALUE COLLECTION MSC-04916201 is a straight flute tap designed to cut internal 5/8-18 UNF threads in a left-hand direction. Built from high-speed steel (HSS) with a bright, uncoated finish, this tap is suited for threading operations where standard coatings are not required. It features a taper chamfer for gradual thread engagement on entry, reducing the load at the start of the cut. With 4 flutes and an H3 thread limit, it holds close dimensional tolerances appropriate for a 3B class of fit. Overall length is 3-13/16 inches with a thread length of 1-13/16 inches, making it a standard proportion for this thread size.

This tap is used in machine shops, maintenance operations, and manufacturing environments where left-hand 5/8-18 UNF threaded holes are required. Left-hand taps are specified when the application demands counter-rotation resistance or where assembly design calls for reverse-thread fastening. The taper chamfer style makes this tap well suited for through-hole tapping where the tap can advance freely past the bottom of the hole. Machinists, tool and die makers, and maintenance technicians working on mechanical assemblies are the primary users of this tool.

Key Features

• Left-hand thread direction for reverse-thread applications
• Taper chamfer provides gradual entry and reduced starting load
• 4 flutes with H3 thread limit for consistent 3B class of fit tolerances
• High-speed steel construction for durability across a range of workpiece materials
• Bright, uncoated finish — no coating buildup to affect thread form accuracy
• Standard tap proportions suitable for use in manual and machine tapping setups

Compatibility

Designed as a standard replacement or production tap for any application requiring a left-hand 5/8-18 UNF internal thread with a 3B class of fit.

Installation Notes

This tap should be installed in a tap wrench, tapping head, or CNC tapping attachment appropriate for its shank size. Secure the workpiece before tapping and ensure the pilot hole diameter is correct for 5/8-18 UNF thread engagement. Apply cutting fluid appropriate for the workpiece material to extend tap life and improve thread finish. Because this is a left-hand tap, rotation direction must be reversed from standard right-hand tapping procedures.