Value Collection JY4843405 Straight Flute Tap 7/16-40 Uns

Product Description

The VALUE COLLECTION JY4843405 is a straight flute tap designed to cut internal threads in through-holes and shallow blind holes. It features a 7/16-40 UNS thread form with a plug chamfer, meaning the first few threads are tapered to ease entry and distribute the cutting load over multiple teeth. Built from high-speed steel with a bright uncoated finish, this tap is suited for threading operations in a range of workpiece materials where coolant-through capability is not required. The H3 thread limit holds close tolerances for a 3B class of fit. Overall length is 3-5/32 inches, making it compatible with standard tap holders and machines used in general metalworking and maintenance environments.

This tap is intended for machinists, tool-and-die makers, and maintenance technicians who need to produce or restore 7/16-40 UNS internal threads. The UNS designation indicates a Unified National Special thread, which appears in precision instrument work, specialty fastener applications, and equipment repair where a non-standard thread pitch is specified. The plug chamfer makes this tap a practical choice for through-hole threading and for starting threads in blind holes where sufficient depth is available. It is used in manual tapping, drill press setups, and CNC tapping operations at appropriate speeds for HSS tooling.

Key Features

• 7/16-40 UNS thread form with right-hand thread direction
• Plug chamfer distributes cutting load for easier thread entry
• 4 straight flutes for chip clearance in general-purpose threading
• H3 thread limit holds 3B class of fit tolerances
• High-speed steel construction for durability across common workpiece materials
• Bright/uncoated finish — no additional coating to affect thread tolerance buildup

Compatibility

Designed as a standard replacement or production tap for applications requiring a 7/16-40 UNS internal thread with a 3B class of fit.

Installation Notes

Tapping should be performed by a qualified machinist following standard tapping procedures. Ensure the workpiece is securely fixtured and the tap is properly aligned before beginning the cut to avoid tap breakage or thread damage. Apply an appropriate cutting fluid for the workpiece material even though this tap does not have coolant-through capability. Back the tap out periodically to clear chips when working in blind holes.