Value Collection JY4838686 Straight Flute Tap 12-32 Unef

Product Description

The VALUE COLLECTION JY4838686 is a straight flute tap designed to cut 12-32 UNEF internal threads in a wide range of materials. Manufactured from high-speed steel with a bright, uncoated finish, this tap delivers consistent thread quality in ferrous and non-ferrous workpieces. The plug chamfer style features a gradual lead that distributes cutting load across several threads, making it well suited for through-hole tapping operations. With 4 flutes and an H3 thread limit, the JY4838686 produces 3B class-of-fit threads that meet standard assembly tolerances. Overall length is 2.375 inches. Licensed machinists, toolroom operators, and production line technicians use this tap with standard tapping machines, drill presses, or hand tap wrenches.

This tap is intended for threading 12-32 UNEF holes in production and maintenance applications. The 12-32 UNEF designation specifies a No. 12 major diameter with 32 threads per inch on the Unified Extra Fine thread series, commonly found in precision instrument work, thin-walled assemblies, and fine-adjustment fastener applications. The right-hand thread direction is standard for the majority of tapping operations. It is sold individually and is compatible with standard tap holders sized for the No. 12 tap shank.

Key Features

• 12-32 UNEF thread form with right-hand thread direction for standard tapping setups
• Plug chamfer distributes cutting load across multiple threads, reducing entry force in through-hole applications
• 4 straight flutes provide chip clearance and stability during the tapping cycle
• H3 thread limit ensures consistent 3B class-of-fit tolerances for standard assembly requirements
• High-speed steel construction offers durability across a broad range of workpiece materials
• Bright, uncoated finish allows easy inspection of the cutting edges before and after use

Compatibility

Designed as a standard replacement or production tap for applications requiring 12-32 UNEF internal threads. Fits standard tap holders and wrenches sized for No. 12 straight-shank taps.

Installation Notes

Installation is performed by machinists or toolroom technicians using a tapping machine, drill press with tapping attachment, or hand tap wrench. Always ensure the pilot hole is drilled to the correct tap drill diameter for 12-32 UNEF before starting the tap. Secure the workpiece firmly and apply appropriate cutting fluid to extend tool life and improve thread finish. Do not force the tap if resistance increases sharply — back off to clear chips before continuing.