Value Collection JY4842241 Straight Flute Tap 3/8-27 Uns

Product Description

The VALUE COLLECTION JY4842241 is a bottoming straight flute tap designed to cut 3/8-27 UNS internal threads in through-holes and blind holes where full thread depth to the bottom is required. Machined from high-speed steel with a bright uncoated finish, this tap delivers reliable performance in general threading applications on ferrous and non-ferrous materials. It features 4 straight flutes and is ground to an H3 thread limit, providing consistent tolerance control within a 3B class of fit. Overall length is 2-15/16 inches. Right-hand threading direction. Suitable for manual tapping and low-speed machine tapping operations.

This tap is intended for machinists, tool and die makers, maintenance technicians, and production shop personnel performing threading operations that require a bottoming chamfer — typically 1 to 2 thread lead — to achieve full thread engagement close to the bottom of a blind hole. The 3/8-27 UNS thread form is commonly found in specialized mechanical assemblies, pipe fittings, and instrument connections that do not conform to standard UN or NPT thread series. No coolant-through capability; suited for use with cutting fluid applied externally.

Key Features

• Bottoming chamfer (1-2 thread lead) allows threading close to the bottom of blind holes
• 4 straight flutes for efficient chip evacuation in through-hole and shallow blind-hole applications
• High-speed steel construction provides wear resistance for general-purpose threading
• Bright uncoated finish suitable for use with a wide range of cutting fluids
• H3 thread limit ground for consistent 3B class of fit tolerance
• Right-hand thread direction; standard operation on conventional tapping equipment

Compatibility

Designed for cutting 3/8-27 UNS right-hand internal threads. Compatible with standard tap wrenches, T-handle tap holders, and machine tapping chucks sized for 3/8-inch shank tooling.

Installation Notes

Threading operations should be performed by qualified machinists or maintenance technicians familiar with hand and machine tapping procedures. Secure the workpiece firmly before tapping and ensure the tap is started square to the hole to prevent cross-threading or tap breakage. Apply an appropriate cutting fluid for the workpiece material throughout the operation. When using a bottoming tap in a blind hole, always follow a taper or plug tap to pre-form threads before finishing with this bottoming tap.