The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X300-20S 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, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X300-20S is a 50 mm bore, double-acting single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke reduction. This model delivers 982 N of push force and 825 N of pull force at 0.5 MPa, scaling up to 1767 N of push thrust at the 0.9 MPa maximum operating pressure. The built-in magnet allows direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection without additional brackets.
With a 20 mm rod, PT1/4 ports, and an M16x1.5 rod thread, this cylinder fits a wide range of standard pneumatic connections. The adjustable cushion decelerates the piston smoothly, while the 300 mm nominal stroke suits medium-reach applications where fine-tuning the end position is critical. The body length A dimension is 194 mm, making it a compact tie-rod design that is not interchangeable with ISO 15552 profiles.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X300-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 300 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. |
| ×300 | 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 setup, the 20 mm adjusting screw lets technicians precisely set the stroke end without swapping cylinders or machining hard stops, speeding up the commissioning process.
On packaging lines, the adjustable stroke allows operators to quickly adapt the cylinder's end position for different box or product sizes, minimizing downtime between batches.
In clamping or pressing applications, the screw can be advanced to take up mechanical wear on tooling or seals, maintaining consistent clamping force and position over the cylinder's service life.
Choose the SCJ50X300-20S when you need to dial in the exact stroke end position during commissioning or product changeovers. If 982 N of push force is insufficient, stepping up to the 63 mm bore provides 1559 N at the same pressure; if space is tight, the 40 mm bore offers 628 N. For a fixed, non-adjustable stroke, the standard SC series is a simpler alternative. This model is a direct replacement for another AirTAC SCJ50X300-20S with PT ports, basic mounting, and a magnet.
At a 300 mm stroke, side-loading and rod buckling become important considerations. Ensure the load is guided externally or use a guided cylinder if significant radial forces are present. The built-in magnet simplifies sensor integration for sequence control, eliminating the need for external limit switches.
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 lower because the rod reduces the effective piston area on the retract side.
Yes, if you need the ability to adjust the stroke end. The SCJ50X300-20S matches the bore and nominal stroke of an SC50X300, but adds a rear adjusting screw. Ensure your mounting and porting (PT1/4) are compatible, and note the body length is slightly longer than the fixed-stroke version.
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