The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X250-50STC 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. Ø50mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCJ50X250-50STC is a double-acting, single-rod tie-rod cylinder with a field-adjustable stroke end, offering up to 50 mm of adjustment via the rear-cap screw. With a 50 mm bore and 20 mm rod, it delivers 982 N of push force at 0.5 MPa, making it a robust choice for applications requiring mid-range force and on-the-fly stroke tuning.
This model comes equipped with a built-in magnet for direct mounting of CMSG/DMSG/EMSG sensors and a centre trunnion (TC) mount, supplied with the TCM1 bracket, allowing the cylinder to pivot for swinging loads. The body length A(SCJ) is 194 mm, and the pneumatic cushion is 21 mm, providing reliable end-of-stroke deceleration.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X250-50STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 50 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. |
| ×250 | 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.
Quickly adjust the end-stop for different product sizes on a packaging or labeling line without swapping the cylinder or adding mechanical stops, reducing downtime between batches.
Fine-tune the actuator's stroke end position during initial machine commissioning to perfectly align with mating tooling or fixtures, eliminating the need for precise custom-stroke orders.
In high-cycle sorting gates or diverters, the 50 mm adjustment screw can be used to take up mechanical wear in linkages or contact surfaces over time, maintaining consistent operation.
Choose the SCJ50X250-50STC when you need a 50 mm bore cylinder with a nominal 250 mm stroke that can be finely adjusted down by up to 50 mm on the machine, perfect for commissioning and format changes. If more force is required, step up to the 63 mm bore which provides 1559 N of push at 0.5 MPa; for a lighter, more compact solution, the 40 mm bore offers 628 N. This trunnion-mounted unit is ideal for pivoting applications, but if a fixed, surface-mounted installation is needed, consider the same model with an LB foot mount.
For replacement, match this unit with another AirTAC SCJ adjustable-stroke cylinder of 50 mm bore, 250 mm nominal stroke, a 50 mm adjust range, PT ports, centre trunnion (TC) mount, and a built-in magnet. At a 250 mm stroke, ensure the rod is adequately supported against side loads; if the application introduces significant lateral force, an external guide rail or a switch to a guided cylinder is necessary to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this 50 mm bore cylinder provides a push force of 982 N. The pull force is 825 N, as the 20 mm rod reduces the effective piston area on the retract stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 200 kgf.
No. As a standard double-acting pneumatic cylinder, the SCJ50X250-50STC will not hold its position if air pressure is lost or the directional valve is centered. The piston can drift or drop under load. The adjustable stroke screw only sets the end position and does not act as a lock. If load holding is required without live pressure, you must add an external rod brake or a pilot-operated check valve.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.