Value Collection JY4841409 Straight Flute Tap 5/16-40 Uns

Product Description

The VALUE COLLECTION JY4841409 is a straight flute plug tap designed for cutting 5/16-40 UNS internal threads in a range of materials. Manufactured from high-speed steel with a bright/uncoated finish, this tap delivers reliable thread-cutting performance in production and maintenance applications. It features 4 straight flutes, an H3 thread limit, and a 3B class of fit, making it suitable for standard tolerance threading work where clean, accurate threads are required. The overall length is 2-23/32 inches. Right-hand thread direction is standard. This tool is used by machinists, maintenance technicians, and tool-room professionals.

The JY4841409 is suited for threading operations on ferrous and non-ferrous metals where through-hole or short blind-hole tapping is performed. The plug chamfer style — typically 3 to 5 chamfered threads — allows the tap to start easily in a pre-drilled hole while cutting full threads quickly. It is commonly used in job shops, industrial maintenance settings, and manufacturing environments where UNS thread forms are specified. The 5/16-40 thread specification is a Unified National Special thread, applied in applications requiring a finer pitch than standard UNS coarse series at this diameter.

Key Features

• 5/16-40 UNS thread form cuts Unified National Special threads at a fine pitch
• 4 straight flutes for consistent chip formation in through-hole and short blind-hole applications
• Plug chamfer style for easy starting and efficient full-thread cutting
• H3 thread limit for standard tolerance control on 3B class of fit threads
• High-speed steel construction provides durability across a broad range of workpiece materials
• Bright/uncoated finish — no coating buildup to affect thread tolerance

Compatibility

Designed for use in standard tapping chucks, tap holders, and manual tap wrenches that accept straight-shank taps. Suitable for 5/16-40 UNS thread applications requiring a 3B class of fit.

Installation Notes

This tap is installed and operated by machinists or maintenance technicians using a tap wrench, tapping head, or CNC tapping attachment. Always ensure the workpiece is secured and the pilot hole is drilled to the correct tap drill diameter for 5/16-40 UNS threads before beginning the tapping operation. Use appropriate cutting fluid for the workpiece material to extend tap life and improve thread quality. Do not force the tap — back off periodically to break chips when tapping by hand.