Sutton T444 3/8 x 24 TPI Forming Tap Single Coolant Groove - HSSE - Bright - ISO 529

The Sutton T444 is a forming (roll) tap with single coolant groove for UNF threads, made from premium grade high speed steel (HSSE) with a bright finish. This listing covers 4 sizes from 1/4 x 28 TPI to 1/2 x 20 TPI.

A forming tap has no flutes and does not cut: it rolls the thread by displacing the metal, so it makes no chips and suits blind and through holes. Forming needs more machine power because of the torque involved, the rolled thread is stronger than a cut thread because the grain structure stays uniform through the thread form, and the tapping drill size differs from that of a cutting tap.

The tap is built to ISO 529: short machine tap construction.

Where this product is used

• For cold forming of threads in materials with good flow characteristics.
• Through or blind holes.
• Depths up to approx. 1.5 x d1.

Design features

• Premium grade high speed steel (HSSE). The vanadium grade gives high wear resistance and toughness for most tapping applications.
• Bright finish for general purpose applications.
• ISO 529 construction, short machine tap construction.

Sizes

Dimensions are in millimetres. Item numbers are the Sutton catalogue numbers. If you are not sure which tapping drill to use, try our tap drill size selector.

Key specifications