Dies & Die Nuts

Dies

Are usually round and are used for cutting external threads. They can be held in a Die Stock for hand operation or in a Die Holder for use by machine.

Dies are usually split which enables adjustment for precision, and also to extend the life of the die as it wears. They can also be solid which makes them fixed.

Taper thread dies (NPT, BSPT) are usually solid. The lead at the front (etched) face is normally 3 pitches, for standard threading, and 2 pitches at the back

face for closer threading, or soft materials.

Die Nuts

Die Nuts are hexagonal, for turning with a wrench or spanner, and are usually used for repairing damaged threads.


Many of the practices employed in tapping also apply to threading with dies. If you do encounter problems the following may help:-

Die Breaks

Work piece diameter too big

Speed too high

Die misaligned

Work piece not chamfered

Die over-adjusted

Die Wears Quickly

Wrong rake angle for material

Speed too hight

Incorrect feed rate

Poor finish (one flank)

Incorrect feed rate

Poor finish (Both flanks)

Clearance holes blocked

Bar diameter too big

Speed too low

Work piece not champhered

Incorrect or lack of lubricant

Wrong rake angle for material

Cold welding

Work piece diameter too big

Speed too low

Incorrect or lack of lubricant

Wrong rake angle for material

Clearance holes blocked

Thread undersize

Die Misaligned

Speed too low

Incorrect or lack of lubricant

Thread oversize

Pulling off too hard

Die chipping

Clearance holes blocked

Work piece not champhered

Bar diameter too big

Speed too high

If you have any questions about any of our engineering tools, please call us on 01527 520 580

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