Airtac SCJ50 Standard Cylinder SCJ50X300-40
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X300-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø50mm bore, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke300 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X300-40
The SCJ50X300-40 delivers a push force of 982 N at 0.5 MPa and 1767 N at the maximum operating pressure of 0.9 MPa, making it a capable mid-bore actuator for moderate transfer and pressing tasks. Its 40 mm rear adjusting screw lets you fine-tune the stroke end position without removing the cylinder, which is especially useful during commissioning or when a machine runs multiple product formats.
This double-acting, single-rod cylinder uses a 20 mm diameter piston rod and PT1/4 ports, with a 21 mm air cushion at each end to decelerate the load smoothly. The tie-rod body has an overall length of 194 mm plus stroke, keeping the assembly rigid while still being straightforward to service.
Airtac SCJ50 Standard Cylinder SCJ50X300-40 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X300-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 40 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
Model Code: Airtac SCJ50 Standard Cylinder SCJ50X300-40
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×300 | Nominal (maximum) stroke length in mm. |
| -40 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Where the Airtac SCJ50 Standard Cylinder SCJ50X300-40 Is Used
Multi-Format Packaging
Adjust the push stroke end by up to 40 mm when switching between different box or tray sizes on a packaging line, eliminating the need for mechanical stops or cylinder swaps.
Press-Fit Depth Control
Fine-tune the insertion depth of a bearing or bushing during setup. The 40 mm adjustment range allows operators to dial in the exact press depth after measuring the first-off part.
Wear Take-Up on Stops
Compensate for wear on a mechanical end stop or tooling pad over time. The rear screw can be advanced slightly to restore the original stroke end position without changing the cylinder.
Is the Airtac SCJ50 Standard Cylinder SCJ50X300-40 the Right Cylinder?
Choose the SCJ50X300-40 when you need a 50 mm bore with a nominal 300 mm reach and the ability to dial the stroke back by up to 40 mm on the machine. If the push force is marginal, stepping up to the 63 mm bore provides 1559 N at 0.5 MPa; if the force is more than enough, the 40 mm bore offers 628 N and a lighter, more compact package. For a fixed-stroke application where no field adjustment is needed, the standard SC50X300 is a simpler and slightly shorter alternative.
At a 300 mm stroke, side-loading and rod buckling become important considerations. If the load is not guided externally, add a guide rail or consider a guided cylinder to protect the rod and bearing from bending moments. A direct replacement must match the 50 mm bore, 300 mm nominal stroke, 40 mm adjustment range, PT port thread, and the basic mounting configuration.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ50 Standard Cylinder SCJ50X300-40 FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 1767 N. Because this is a single-rod cylinder, the pull force is lower due to the area taken up by the 20 mm rod.
Yes, provided the mounting and port thread match. The SCJ body is slightly longer to house the adjusting screw, but the bore, rod, and port size are identical. You gain the ability to shorten the stroke end by up to 40 mm without changing the cylinder.
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