What is The Difference Between a Hexagon Die Nut and a Standard Split Die?

If you need to cut or repair a thread and you have never done it before, it is important to understand the difference between these two types of dies.

HEXAGON DIE NUTS	SPLIT DIES

Hexagon Die Nuts

Hexagon die nuts are generally the fitting to use when repairing a damaged male thread. Unlike split dies, they are not adjustable.

Hexagon die nuts can be turned using a standard spanner, wrench or socket. They are occasionally used to cut new threads in difficult to reach locations where there is no room to use the standard split die method.

Split Dies

A split die is generally used to cut a new male thread onto a piece of bar, such as you would find on a bolt.

The split die fits into a die holder, called a die stock. It is held in place by three securing screws. On the initial cut, the centre screw which is aligned with the split in the die is fully screwed in. This opens up the die as far as it can go, making the initial cut easier as the die is not cutting the full depth of the screw thread first time around.

After the first cut, the screw is released slightly to close the die, allowing a deeper thread to be cut.

Cutting oil should always be used in conjunction with dies and die nuts.