The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X50-50S 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, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X50-50S delivers 628 N of push force at 0.5 MPa, making it a solid mid-range actuator for light assembly and packaging tasks. Its 50 mm rear-end adjustment screw lets you fine-tune the stroke end position across the full nominal stroke, eliminating the need for external hard stops during commissioning or format changes.
This model includes a built-in magnet, so you can directly mount CMSG/DMSG/EMSG sensors on the tie-rod barrel for reliable end-of-stroke detection. The 16 mm diameter piston rod and PT1/4 port ensure a robust connection, while the 21 mm air cushion at each end provides smooth deceleration in high-speed applications up to 800 mm/s.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X50-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 50 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. |
| ×50 | 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.
Perfect for test rigs and prototyping where the final stroke length is determined during setup. The 50 mm adjustment screw allows engineers to dial in the exact stopping point without swapping cylinders.
Ideal for ejecting parts from a mold or fixture where the ejection distance needs fine-tuning to prevent part damage. The adjustable stroke provides precise control over the ejection force application point.
Used on packaging conveyors to push products onto a side lane. The adjustable stroke compensates for wear on the gate mechanism over time, ensuring a consistent, full-open position without reprogramming.
Choose the SCJ40X50-50S when you need a compact 40 mm bore with the flexibility to adjust the stroke end on the fly. If your force requirement grows, stepping up to the 50 mm bore provides a substantial jump to 982 N of push force at the same 0.5 MPa pressure. For applications that don't require stroke adjustment, the fixed-stroke SC40X50 is a simpler, cost-effective alternative.
This cylinder is a direct replacement for any AirTAC SCJ40X50-50S with a PT port and basic mounting. The built-in magnet is essential for sensor feedback; if your machine uses CMSG/DMSG switches, ensure the replacement also carries the -S suffix to maintain compatibility.
Adjustable-stroke checklist
The rear cap contains a screw that limits how far the piston can retract. By turning this screw, you can shorten the retracted stroke end by up to 50 mm from its nominal 50 mm stroke. This is a mechanical stop adjustment, not a force or speed control.
At 0.5 MPa, the push force is 628 N, and the pull force is 528 N. The pull force is lower because the 16 mm piston rod reduces the effective area on the return stroke. This is standard for a single-rod cylinder.
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