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Safety Handbook for Hydraulic Punch

Hydraulic punches are designed to perforate metal with round, square or oblong holes. They are designed to work on mild steel, non-ferrous metals and some plastics (non-shattering). Hydraulic punches may be powered by hand pumps, air/ hydraulic, gas, or electric driven pumps which develop up to 10,000 psi (700 bar).


  • Do not exceed the maximum punch limits as shown on the tool decal, instruction sheets or catalog.
  • Protect punch and die sets. Return to storage case after use.
  • Keep punch and dies clean. Lubrication is not required, but will extend punch and die life.
  • Use only Enerpac oil in punch and pump.
  • Always match punch and die correctly. Install dies with larger opening facing down.
  • Cracked, chipped, or worn punches and dies should be replaced immediately.

1. Remove the punch by using the pin tool or spanner wrench to loosen the punch retainer.
2. Use an allen wrench to remove the set screw in the lower jaw of the punch frame. Remove the die from the frame.
3. Install dies with larger openings facing down or away from the punch.
4. Tighten the set screw.
5. Caution: Indexing slots are used with square and oblong dies to keep them aligned with the matching punch.
6. I mportant : Square or oblong punches must be installed using the square key provided with the punch. The square key must engage the slot of the punch plunger. Do not use the square key with round punches.
7. Install the punch with the long stem facing downward.
8. Before using the punch make sure that the set screw and cap nut are tightened securely.
9. Advance the punch through the die and check for proper alignment. The punch must pass freely through the die. Minor adjustments to the die are possible by loosening the set screw and repositioning the die, then re-tightening the set screw.

IMPORTANT: During punching operation, periodically check the cap nut to ensure that the punch remains tight. Remove the slugs from the punch to prevent damage.

Dry stripping is a principal cause of punch failure. Lubrication will facilitate easy punching and will significantly prolong the life of the punch.

Click the following link to view the entire Safety Seminar Handbook