Explanation:

Dies:

• Threading dies are used to cut external threads on cylindrical workpieces.

Types of Dies:

The following are the different types of dies:

• Circular Split Die (Button die)
• Half Die
• Adjustable Screw Plate Die

• This has a slot cut to permit slight variations in size.
• When held in the diestock, variation in the size can be made by using the adjusting screws.
• This permits increasing or decreasing the depth of the cut.
• When the side screws are tightened the die will close slightly.
• For adjusting the depth of the cut, the center screw is advanced and locked in the groove.
• This type of die stock is called button pattern stock.

Half Die:

• Half dies are stronger in construction.
• Adjustments can be made easily to increase or decrease the depth of the cut.
• These dies are available in matching pairs and should be used together.
• By adjusting the screw of the diestock, the die pieces can be brought closer together or can be moved apart.
• They need a special die holder.

Adjustable Screw Plate Die:

• This is another type of a two-piece die similar to the half die.
• This provides greater adjustment than the split die.
• The two die halves are held securely in a collar by means of a threaded plate (guide plate) which also acts as a guide while threading.