Value Collection JY63328421 Spiral Flute Tap 1/2-20 Unf

Product Description

The VALUE COLLECTION JY63328421 is a spiral flute tap designed for cutting 1/2-20 UNF internal threads in a wide range of non-ferrous and light metals. Built from high-speed steel with a bright, uncoated finish, this tap features four right-hand spiral flutes with a 45-degree helix angle that evacuates chips up and out of the hole during the tapping operation. The bottoming chamfer geometry allows threading to be carried nearly to the bottom of a blind hole. Overall length is 3.375 inches. It is sized to a 3B class of fit and an H3 thread limit, making it suitable for general-purpose threaded assemblies that require a standard tolerance fit.

This tap is intended for use in materials including aluminum, brass, copper, magnesium, and zinc die cast. The fast-flute spiral design and 45-degree helix angle make it particularly effective in gummy or ductile materials where chip packing in straight-flute taps is a concern. It is suited for both manual tapping and CNC or turret machine applications where controlled feed rates can be maintained. Coolant-through capability is not supported on this tap, so external cutting fluid application is recommended when tapping at higher speeds or in tighter tolerance work.

Key Features

• 1/2-20 UNF thread size with H3 thread limit and 3B class of fit for standard tolerance assemblies
• Bottoming chamfer for threading close to the bottom of blind holes
• 45-degree right-hand spiral flutes evacuate chips upward, reducing packing in ductile materials
• High-speed steel construction provides good wear resistance across non-ferrous applications
• Bright, uncoated finish — compatible with most cutting fluids and oils
• Right-hand thread direction; overall length 3.375 inches

Compatibility

Designed for tapping 1/2-20 UNF threads in aluminum, brass, copper, magnesium, and zinc die cast workpieces. Suitable for use with standard 1/2-20 tap holders and tapping chucks that accept the appropriate shank diameter for this tap size.

Installation Notes

This tap should be installed by a machinist or tooling professional familiar with threading operations. Secure the workpiece fully before beginning the tapping cycle, and ensure proper alignment to avoid tap breakage. Apply a suitable cutting fluid or tapping oil to extend tool life and improve thread finish, particularly in copper and aluminum. When tapping blind holes, confirm the hole depth provides adequate clearance beyond the required thread depth before advancing the tap.