Value Collection JY4838744 Straight Flute Tap 12-40 Uns

Product Description

The VALUE COLLECTION JY4838744 is a straight flute tap designed for cutting internal threads in a 12-40 UNS thread form. Built from high-speed steel with a bright, uncoated finish, it delivers reliable performance in a wide range of ferrous and non-ferrous materials. The plug chamfer style provides a moderate lead-in of several threads, making it well suited for through-hole tapping applications. With 4 flutes and an H2 thread limit, it holds tight tolerance on a 3B class of fit, the standard fit class for most general-purpose threaded assemblies. Overall length is 2.375 inches. This tap is intended for right-hand thread cutting and does not require coolant-through capability.

This tap is used in machining, maintenance, and repair environments where a 12-40 UNS thread is required. The 12-40 UNS designation is an Unified National Special thread form, used when standard coarse or fine pitches do not meet design requirements. Typical applications include precision instrument work, small fastener repair, and specialty assembly tasks across industrial, aerospace, and mechanical maintenance settings. It is sold individually and suited for both production and bench work where a plug-style tap is the preferred starting point.

Key Features

• 12-40 UNS thread form for specialty unified national special thread cutting
• Plug chamfer provides moderate lead-in for efficient through-hole tapping
• 4-flute design supports chip clearance and thread form accuracy
• H2 thread limit holds 3B class of fit tolerance for general-purpose assemblies
• High-speed steel construction handles a broad range of work materials
• Bright, uncoated finish for straightforward inspection and compatibility with common cutting fluids

Compatibility

Designed as a straight flute tap for right-hand 12-40 UNS threaded holes in through-hole tapping applications across general machining and maintenance repair operations.

Installation Notes

This tap is installed by machinists and maintenance technicians using a tap wrench, tapping head, or machine spindle. Always ensure the workpiece is securely fixtured and the tap is properly aligned to the hole axis before beginning the cut. Apply an appropriate cutting fluid for the work material to extend tool life and improve thread quality. Back the tap out periodically to break and clear chips, and never force a tap against resistance to avoid breakage.