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Marks Pryor Low Stress Punches


The choice of the professional engineer, hardened and tempered to precise limits to give long life and maximum safety. Especially for use in the Aircraft, Nuclear and Gas industries or where reduced stress marking is required

Pryor Lowstress Punches are manufactured from quality controlled Chromium Tool Steel allied to precise heat treatment, giving a hardness of 58-62 Rockwell 'C' at the character and 32-40 Rockwell 'C' at the striking end.

Suitable for marking material up to 38 Rockwell 'C'

For guidance on hardness of material to be marked click here

Nickel plated for rust protection

Heavy Duty Punches

Available in two character styles, continious line or dot formation
Pryor Lowstress Punches appear as shown
Heavy Duty Punches
To produce a readable impression
Heavy Duty Punches
Pryor Lowstress Punches are manufactured with special rounded characters

The diagram shows the effect on the crystalline structure of material being marked with a sharp faced character
A lowstress impression helps avoid premature cracking, by eliminating the stress concentration at the bottom of the indentation


Ministress Punches have special rounded, continious line characters for low stress marking.


The Punch Safety Grip firmly holds all sizes of Pryor Punch and allows a hard blow to be struck without the risk of jarring or damaging the fingers of the user.