4MAJ Series Tie Rod Cylinders, 1-1/2" to 8" Bore Sizes, Rod Lock Option | Parker NFPA




  • Industry leading NFPA interchangeable rod lock cylinder with flexible construction
  • Rod lock holding force equivalent to cylinder outpuit force at 100 PSI
  • Manual override feature standard on all configurations
  • Cushions - standard and adjustable at both ends
  • Strokes available in any practical stroke length

Operating Information:

Operating pressure -

  • 100 PSI (7 bar) maximum air pressure, except 2" bore with 1" rod, rated at 80 PSI
  • 60 PSI (4.1 bar) minimum air pressure to release rod lock

Temperature range -

  • Standard seals: -10°F to 165°F
  • Fluorocarbon seals: -10°F to 250°F

General Specifications:

  • Bore sizes - 1-1/2", 2", 2-1/2", 3-1/4", 4", 5", 6" and 8"
  • Rod diameters - 5/8", 1", 1-3/8" and 1-3/4"
  • Single or double rod ends
  • 4 standard rod end styles; specials available
  • 17 standard mounting styles

Material Specs Options and Modifications Mounting Styles


Material Specifications for Standard Temperatures and Applications

Head and Cap Black anodized aluminum alloy
Head and Cap Screws Zinc plated steel alloy
Cylinder Body Clear anodized aluminum alloy
Piston Rod Case-hardened, chrome plated carbon steel
Rod Lock Housing Black anodized aluminum alloy
Rod Lock Wiper Fluorocarbon
Rod Lock Screws Black oxidized steel alloy
Manual Override Shaft 416 stainless steel
Rod Seal Carboxylated nitrile (Nitroxile)
Rod Wiper Molythane
Rod Bearing (Gland) Bronze alloy
Piston Aluminum alloy
Piston Seals Carboxylated nitrile (Nitroxile)
Piston Bearing Composite (for standard piston); MolyGard™ (for aluminum piston)
Magnetic Ring Plastic-bound magnetic material
Piston Fastener Piston rod for aluminum piston
O-Rings Nitrile
End Seals Nitrile
Cushion Seals Urethane
Cushion Needle Valves Stainless steel
Tie-Rods/Studs Blackened carbon steel 1018 (some mounts)
Tie-Rod Nuts Steel alloy, SAE J995 Grade 8 (some mounts)

Options and Modifications:

  • Piston bumper seals
  • Piston bumpers (1/4" thick)
  • Port and cushion adjust relocation
  • Port thread styles
  • Multiple ports
  • Adjustable sensors
  • Linear position sensing option (LPSO)
  • Double rod end
  • Stop tube
  • Mixed mountings
  • Round tube and tie rod construction
  • Shock absorber on cap end
  • Hydro-Check unit for smooth hydraulic control
  • Air cylinder/valve combination (ACVB)
  • Rod end modifications

(For a guided verseion of the 4MAJ Series, see the HB series page.)

Mounting Styles - Dimensions (Small Bore, Up to 5"):

Mounting Styles - Dimensions (Large Bore, 6" & 8"):


Available Pneumatic Cylinder Styles

Tie-rod air cylinder - non-rotating Tie Rod Cylinders
Round Body Cylinders
Compact Cylinders
Guided Cylinders
Rodless Cylinders


Quote by Part Number Help with Cylinder Identification

Engineering & Product Selection Information

Pneumatic Product Selection

  • Pneumatic Actuators & Air Cylinders
  • Pneumatic Cylinders
  • Automation Products: rotary actuators, grippers, slide tables, rotary tables, escapement
  • Actuator Accessories: Linear alignment couplers, flow controls, air oil tanks, rodlocks, electronic sensors, shock absorbers

Application Engineering Data


California Prop 65 Warning WARNING: These products can expose you to chemicals including lead and/or DEHP and/or carbon black, which are known to the State of California to cause cancer or birth defects or other reproductive harm.  For more information go to www.P65Warnings.ca.gov