The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X225-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø40mm bore, 225mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X225-50S is a double-acting, single-rod pneumatic cylinder featuring a rear-cap adjusting screw that provides a 50 mm field-adjustable stroke range, letting you fine-tune the stroke end position without swapping the cylinder. Its 40 mm bore delivers 628 N of push force at 0.5 MPa, making it a practical choice for medium-force applications where commissioning adjustments or format changeovers are frequent.
This model includes a built-in magnet (-S suffix), enabling direct mounting of CMSG, DMSG, or EMSG sensors along the tie-rod barrel for reliable end-of-stroke detection. The cylinder uses a 16 mm diameter piston rod, PT1/4 ports, and an M12x1.25 rod thread. Its adjustable air cushion decelerates the piston smoothly over the final 21 mm of travel.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X225-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 225 mm |
| Stroke adjustment | Up to 50 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×225 | Nominal (maximum) stroke length in mm. |
| -50 | 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.
The 50 mm adjusting screw allows engineers to dial in the exact stroke end position during machine commissioning, eliminating the need to stock multiple fixed-stroke cylinders for trial-and-error setups.
Ideal for packaging or sorting lines that handle different product sizes. The stroke can be quickly re-adjusted to accommodate a new box height or pallet width, reducing downtime between batches.
In clamping or pressing operations, the adjustable stroke can be used to take up mechanical wear on tooling or contact surfaces over time, maintaining consistent clamping force without replacing the actuator.
Step up to the 50 mm bore SCJ (982 N push at 0.5 MPa) if your load requires more force, or down to the 32 mm bore (402 N push) for lighter, more compact tasks. If your application does not require field-adjustable stroke, a fixed-stroke SC cylinder is a simpler, cost-effective alternative. For direct replacement, match the SCJ40 bore, a 225 mm nominal stroke, the -50 adjust range, PT1/4 ports, a basic mount, and the -S magnet option.
At a 225 mm stroke, ensure the rod is not subjected to significant side loads. If lateral forces are present, use an external linear guide or switch to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, the push force is 628 N and the pull force is 528 N. The maximum push force at 0.9 MPa is 1130 N. Note that pull force is lower due to the area of the 16 mm piston rod.
Yes, provided you match the 40 mm bore, PT1/4 ports, and basic mounting. The SCJ40X225-50S offers a nominal 225 mm stroke that is adjustable down by up to 50 mm, giving you more flexibility on the machine. It is a direct dimensional upgrade for an SC of the same bore and stroke.
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