The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X400-10S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø50mm bore, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X400-10S is a 50 mm bore double-acting single-rod air cylinder with a field-adjustable stroke end, giving you up to 10 mm of fine-tuning on the retract position without swapping the unit. Its 20 mm diameter piston rod and PT1/4 ports deliver 982 N of push force at 0.5 MPa, making it a solid mid-range actuator for tasks where the stroke length needs to be dialed in precisely during commissioning or after wear.
This model includes a built-in magnet (-S suffix), so you can directly mount CMSG/DMSG/EMSG reed or solid-state sensors on the tie-rod barrel for reliable end-of-stroke detection. The standard TPU seals and PT threads keep it compatible with common filtered air systems, while the 21 mm air cushion at each end protects the cylinder from hard metal-to-metal impacts at speeds up to 800 mm/s.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X400-10S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 400 mm |
| Stroke adjustment | Up to 10 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.
| 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.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×400 | Nominal (maximum) stroke length in mm. |
| -10 | 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.
Fine-tune the retract end position by up to 10 mm during initial machine setup to perfectly align a stop point without needing to machine custom spacers or reposition the entire cylinder.
On a packaging line, use the 10 mm adjustment to take up mechanical play or seal wear in a pusher mechanism over time, maintaining consistent product placement without immediate cylinder replacement.
Quickly adjust the stroke end for a different product size on a small assembly fixture, using the sensor magnet to confirm the new position is reached every cycle.
Choose the SCJ50X400-10S when you need a 400 mm nominal stroke with the ability to shorten the retract end by up to 10 mm. If 982 N of push force at 0.5 MPa is insufficient, stepping up to the 63 mm bore (SCJ63) provides 1559 N; if it is more force than you need, the 40 mm bore (SCJ40) delivers 628 N. For applications that do not require on-machine stroke adjustment, a fixed-stroke SC50X400 cylinder is a simpler, more cost-effective alternative.
At 400 mm of stroke, be mindful of side loading on the 20 mm rod. If your application applies any radial force, use an external guide rail or switch to a guided cylinder to prevent rod bending and premature seal wear. This SCJ model is a direct replacement for another AirTAC SCJ50X400-10S with PT ports, a basic mount, and a magnet sensor.
Adjustable-stroke checklist
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. The pull force is always lower because the rod reduces the effective piston area on the retract side.
You can only replace it if the fixed-stroke SC was a 50 mm bore with a 400 mm stroke and PT ports, and you now need the 10 mm adjustable feature. The SCJ body is slightly longer to house the adjusting screw, so ensure you have the extra space. It is a direct match for another SCJ50X400-10S with a basic mount and magnet.
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