The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X50-20 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, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X50-20 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, offering a 20 mm adjustment range via a rear-cap screw. At 0.5 MPa, it delivers 982 N of push force and 825 N of pull force, making it a capable mid-bore actuator for tasks that need precise end-position tuning without swapping the cylinder.
With a 20 mm rod, PT1/4 ports, and a 21 mm air cushion, this tie-rod cylinder is built for flexible integration. The body length (A dimension) is 194 mm, providing a compact footprint for its 50 mm bore. The screw adjusts only the stroke end position, not the force or speed, allowing operators to dial in the exact stopping point during commissioning or format changes.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X50-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 50 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. |
| ×50 | 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.
During machine commissioning, the 20 mm adjustment screw lets technicians quickly dial in the exact stroke end position to align with tooling or stops, eliminating the need to shim or reposition the cylinder body.
On packaging or sorting lines, operators can adjust the stroke end to accommodate different product sizes or box heights without mechanical modifications, reducing downtime between production runs.
In clamping or pressing fixtures, the adjustable stroke end can be periodically advanced to compensate for pad or tooling wear, maintaining consistent clamping force and part contact without replacing components.
Choose the SCJ50X50-20 when you need to fine-tune the stroke end position by up to 20 mm on the machine. If your application requires a fixed, non-adjustable stroke, the standard SC50X50 is a simpler, cost-effective alternative. For higher push force at the same pressure, step up to the 63 mm bore (1559 N push at 0.5 MPa); for a lighter, more compact solution, the 40 mm bore provides 628 N.
A direct replacement must match the 50 mm bore, 50 mm nominal stroke, 20 mm adjustment range, PT ports, and basic mounting. This model uses the standard TPU seal and has no magnet. If you need piston position sensing, order the -S variant to accept CMSG/DMSG sensors.
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 1.0 MPa, the theoretical push force reaches 2000 N (200 kgf). The pull force is lower due to the 20 mm rod reducing the piston area on the return stroke.
Yes, if you need the adjustable stroke feature. The SCJ50X50-20 has the same bore, nominal stroke, and port size as an SC50X50, but includes a rear adjusting screw that adds 21 mm to the overall length. Ensure the 20 mm adjustment range covers your stroke-end variation requirement.
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