In this article we would like to introduce you to dies, combination dies and hexagon die nuts.
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For the production of external threads according to ISO standards for metric standard threads from M1 – M 68 and for metric fine threads M1 – M56, round dies in pre-slit design (form B) are used. For the outside diameters d=16 mm and d= 20 mm the dies have three chip holes, for larger versions four or more chip holes. The dies can be used on both sides, because the gates are on both sides.
Round Die EN ( alt = DIN 223 )
Dies with the same outer diameter of d = 25 mm for sizes M3 M4 M5 M6 M8 M10 M12 are called combination dies. They deviate from the DIN standard in their outside diameter. This means that the user only needs one die holder in the size 25 x 9 mm for the sizes M3-M12. (see also: Threading tool sets in combination design)
Hexagon cutting nuts are used for assembly work and for re-cutting threads in materials with low and medium tensile strength. The standardized wrench dimensions of the hexagon allow the use of ring or open-end wrenches as operating tools. The hexagonal outer surfaces are burnished to be abrasion-resistant and corrosion-resistant.
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.
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HEXAGON DIE NUTS SPLIT DIESHexagon 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.
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.