Value Collection JY63328751 Straight Flute Tap 5/8-40 Uns

Product Description

The VALUE COLLECTION JY63328751 is a straight flute tap designed to cut 5/8-40 UNS internal threads in a variety of workpiece materials. Built from high-speed steel (HSS) with a bright, uncoated finish, this tap delivers reliable thread cutting performance in both production and maintenance machining environments. The plug chamfer — typically 3 to 5 threads of lead — makes it well suited for through-hole applications where the tap can pass fully through the material. With 4 flutes and a right-hand thread direction, it operates with standard right-hand tap wrenches or machine setups. The H3 thread limit ensures dimensional consistency and proper fit for UNS 5/8-40 threaded assemblies.

This tap is intended for machinists, toolmakers, and maintenance technicians working with non-standard UNS thread forms. The 5/8-40 UNS designation covers fine-pitch threading applications where standard Unified National thread series pitches do not apply. It is appropriate for use in manual tapping operations with a tap wrench or in CNC and manual machine tool setups where coolant-through is not required. Typical applications include toolroom work, fixture fabrication, and specialty mechanical assemblies requiring fine UNS threading.

Key Features

• 5/8-40 UNS thread form — fine-pitch non-standard unified thread for specialty applications
• High-speed steel (HSS) construction for durability across a range of workpiece materials
• Plug chamfer provides 3 to 5 thread lead, optimized for through-hole tapping
• 4-flute design offers balanced cutting action and good chip clearance
• H3 thread limit ensures consistent tolerance and proper mating thread fit
• Bright/uncoated finish — no coating buildup interference in critical thread dimensions

Compatibility

Designed for use in through-hole applications requiring 5/8-40 UNS right-hand internal threads. Compatible with standard tap wrench drives and machine tap holders suitable for the 5/8-inch tap shank size.

Installation Notes

This tap should be installed and operated by a qualified machinist or toolroom technician. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter for a 5/8-40 UNS thread before tapping. Apply appropriate cutting fluid for the workpiece material to reduce heat and extend tap life. Do not force the tap if resistance increases — back off to clear chips and prevent tap breakage.