Parker Pneumatic
4MAJ NFPA Aluminum Air Cylinder with Rod Lock

4MA series air cylinder fitted with Rod Lock.

  • Piston Rod Lock with standard manual release
  • Holding Forces to resist up to 100 psi input

The rod lock is a spring-activated type with air pressure release and clamps the piston rod to lock it into position. In the absence of an appropriate air signal, full holding force is applied to the piston rod. When a 60 PSI (or greater) air signal is present, the locking device is released. All rod locks include a manual override shaft to free the rod lock without air pressure during non-production activities.

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Bore/Stroke
  • 4MAJ Bore sizes – 1-1/2", 2", 2-1/2", 3-1/4", 4", 5", 6" and 8"
  • Strokes – available in any practical stroke length

Rods

  • Case-hardened, chrome plated carbon steel  (standard).
  • 17-4 PH stainless steel,chrome plated optional
  • Rod diameters – 5/8", 1", 1-3/8" and 1-3/4"

Installation

  • 4MAJ rod lock will operate in both directions, engaging with the same holding force.
  • 4MAJ can be mounted in any position.
  • Exhaust air from the rod lock can be piped away when there are demands for a contaminant-free environment.
  • 4MAJ is not intended for use in water service applications, or in environments that have high humidity levels and/or splashing fluids present.

Holding Considerations

  • Piston rod rotation is not allowed when the rod lock is engaged (not intended for torsional braking).
  • Rod lock is suitable for infrequent dynamic braking (emergency stops). Since the 4MAJ rod lock is designed for static applications, repeated dynamic stops will cause rod and/or bearing wear and reduce holding forces.
  • The rated holding force corresponds to static load conditions. If the rated value is exceeded, slipping and other problems may occur.
  • If personal safety is required, an unrelated, redundant safety system is recommended.


Operating pressure

  • Maximum 100 PSIG (6.9 Bar) air service, except for 2" bore with 1" rod (rated at 80 PSIG)
  • Minimum 60 PSIG (4.1 Bar) air pressure to release rod lock

Media:  dry, filtered air

Temperature range: -10°F to +165°F

Rod Lock Materials

  • Rod lock housing.......... Black anodized aluminum alloy
  • Rod lock wiper.............. Fluorocarbon
  • Manual override shaft... 416 stainless steel
  • Rod lock screws........... Black oxided steel alloy