Airtac SCJ50 Standard Cylinder SCJ50X50-20SH
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X50-20SH 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.
- BoreØ50 mm
- Nominal stroke50 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X50-20SH
The SCJ50X50-20SH is a 50 mm bore, single-rod, double-acting cylinder with a 50 mm nominal stroke and a rear adjusting screw providing a 20 mm field-adjustable range. It delivers 982 N of push force at 0.5 MPa, making it a strong mid-range actuator. This model is configured with high-temperature Viton (FKM) seals, extending the operating range from 0 to +150 °C, and a built-in magnet for direct mounting of CMSG/DMSG sensors.
Because the stroke end is set by the rear screw, you can fine-tune the piston stop position without removing the cylinder from the machine, which is ideal for commissioning and format changeovers. The 20 mm rod and PT1/4 ports handle standard pneumatic plumbing, and the adjustable air cushion decelerates the 50 mm bore piston smoothly. The body length A(SCJ) for this bore is 194 mm, slightly longer than the fixed-stroke SC version to house the adjustment mechanism.
Airtac SCJ50 Standard Cylinder SCJ50X50-20SH Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X50-20SH |
|---|---|
| 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.
Theoretical Output Force (Ø50mm)
| 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.
Model Code: Airtac SCJ50 Standard Cylinder SCJ50X50-20SH
| 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.
Where the Airtac SCJ50 Standard Cylinder SCJ50X50-20SH Is Used
End-Stop Calibration
The 20 mm rear adjustment screw allows operators to dial in the exact stroke end position during initial machine commissioning, compensating for assembly tolerances without needing custom shims or external hard stops.
High-Temperature Format Changeover
In heated packaging or forming tools, the Viton seals handle 0-150°C environments. The adjustable stroke lets a single cylinder adapt to different product sizes on a hot platen, reducing changeover time.
Sensor-Controlled Pressing
The built-in magnet enables clean CMSG/DMSG sensor mounting to confirm the piston has reached the adjusted end position, providing a reliable signal for a press or clamping sequence that requires fine depth control.
Is the Airtac SCJ50 Standard Cylinder SCJ50X50-20SH the Right Cylinder?
Choose the SCJ50X50-20SH when you need a mid-force actuator with a stroke that can be tweaked on the machine. If you need more force, step up to the 63 mm bore SCJ63, which provides 1559 N of push force at 0.5 MPa. For a fixed, non-adjustable stroke, the standard SC50 is a simpler alternative. This cylinder is a direct replacement for another AirTAC SCJ50 with a 50 mm stroke and 20 mm adjust range, using PT ports, basic mounting, a magnet, and Viton seals.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ50 Standard Cylinder SCJ50X50-20SH FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. The push force is higher because the single rod reduces the effective piston area on the return stroke. The maximum push force at the 0.9 MPa operating limit is 1767 N.
A screw in the rear cap sets the stroke end position, shortening the 50 mm nominal stroke by up to 20 mm. It is a mechanical end-stop, not a locking device. The piston will drift if air pressure is lost; for load holding without pressure, you must add an external rod lock or a pilot-operated check valve.
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