The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X25-20 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø50mm bore, 25mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X25-20 is a 50 mm bore double-acting single-rod cylinder with a 25 mm nominal stroke and a 20 mm rear adjusting screw, giving you field-adjustable stroke-end control for commissioning and fine-tuning. It delivers 982 N of push force at 0.5 MPa (1767 N at 0.9 MPa) and 825 N pull, using a 20 mm diameter piston rod and PT1/4 ports.
This tie-rod cylinder features an adjustable air cushion (21 mm long) to decelerate the piston smoothly. The body length A(SCJ) is 194 mm, making it a compact choice when you need to dial in the exact end position on the machine without adding external hard stops.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X25-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 25 mm |
| Stroke adjustment | Up to 20 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. |
| ×25 | Nominal (maximum) stroke length in mm. |
| -20 | 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.
Dial in the exact stroke end position during machine commissioning without swapping cylinders or machining spacers. The 20 mm rear screw lets technicians fine-tune the stop point quickly on the factory floor.
When packaging lines switch between product sizes, the adjustable stroke lets operators reset the push or clamp position in minutes. No need to stock multiple fixed-stroke cylinders for each format.
In high-cycle pick-and-place or pressing operations, mechanical wear can shift the effective stroke. The rear adjuster takes up the slack, restoring precise positioning without dismantling the actuator.
Step up to a 63 mm bore (SCJ63, 1559 N push at 0.5 MPa) if you need more force, or down to 40 mm (628 N) for a lighter, faster actuator. The SCJ is the right pick when you need to adjust the stroke end in the field; if your stroke is fixed and never changes, the standard SC series saves cost. For replacement, match an SCJ with 50 mm bore, 25 mm nominal stroke, 20 mm adjust range, PT ports, and the same mounting style. If your stroke exceeds 300 mm, consider an external guide or a guided cylinder to protect the 20 mm rod from side-load bending.
Adjustable-stroke checklist
At 0.5 MPa, push force is 982 N and pull force is 825 N. At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N. The theoretical maximum at 1.0 MPa is 200 kgf. Because it is a single-rod cylinder, push force is always greater than pull force.
A rear-cap screw lets you shorten the stroke end by up to 20 mm, so the 25 mm nominal stroke can be reduced in the field. Choose SCJ when you need to fine-tune the end position during setup, format changes, or wear take-up. If your stroke is fixed and never needs adjustment, the standard SC fixed-stroke cylinder is the more economical choice.
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