Airtac SCJ50 Standard Cylinder SCJ50X120-30TC
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X120-30TC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø50mm bore, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke120 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X120-30TC
The SCJ50X120-30 is a double-acting, single-rod pneumatic cylinder that puts fine stroke-end adjustment directly on the machine. A rear-cap screw lets you dial the end position back by up to 30 mm, making it ideal for commissioning trials or format changeovers where the exact stop point needs to be tuned without swapping the cylinder. With a 50 mm bore and 20 mm piston rod, it delivers 982 N of push force at 0.5 MPa and up to 1767 N at the maximum operating pressure of 0.9 MPa.
This model ships with a centre trunnion (TC) mount and the matching TCM1 bracket, allowing the cylinder to pivot as it strokes—perfect for swinging or articulating loads. The body length A(SCJ) is 194 mm plus stroke, and the adjustable air cushion decelerates the piston smoothly at each end. Ports are PT1/4, and the rod thread is M16x1.5. The 120 mm nominal stroke is well within the 1200 mm maximum standard stroke for this bore.
Airtac SCJ50 Standard Cylinder SCJ50X120-30TC Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X120-30TC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 120 mm |
| Stroke adjustment | Up to 30 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 SCJ50X120-30TC
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×120 | Nominal (maximum) stroke length in mm. |
| -30 | 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 SCJ50X120-30TC Is Used
Commissioning & Setup
The 30 mm rear screw adjustment allows technicians to quickly dial in the exact stroke end position during machine commissioning without removing the cylinder or adding external hard stops.
Format Changeovers
On packaging or assembly lines that switch between product sizes, the adjustable stroke lets operators reset the pusher or stopper position in seconds, reducing downtime between batches.
Wear Compensation
In clamping or pressing fixtures, the stroke can be incrementally extended over time to compensate for tooling or pad wear, maintaining consistent contact force without replacing the actuator.
Is the Airtac SCJ50 Standard Cylinder SCJ50X120-30TC the Right Cylinder?
Choose the SCJ50X120-30 when you need a 50 mm bore cylinder with a field-adjustable stroke end and a pivoting trunnion mount. If your force requirement is lower, stepping down to the 40 mm bore (628 N push at 0.5 MPa) saves space; for more force, the 63 mm bore provides 1559 N. The 30 mm adjustment range is useful for absorbing tolerance stack-up or fine-tuning the end position after installation.
For a direct replacement, match an AirTAC SCJ adjustable-stroke cylinder with a 50 mm bore, 120 mm nominal stroke, a 30 mm adjust range, PT ports, and the TC centre trunnion mount (order with F-SC50TC and TCM1 bracket). If your application does not require stroke adjustability, a fixed-stroke SC cylinder with the same bore and mounting is a simpler alternative. At 120 mm stroke, rod bending from side loads is minimal, but for any off-axis force, an external guide rail is recommended.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-30)
- ✓ 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 SCJ50X120-30TC FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N (the difference is due to the single 20 mm rod). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1964 N.
A rear-cap adjusting screw shortens the stroke end by up to 30 mm, setting a new mechanical stop position. Pick the SCJ when you need to fine-tune the stroke on the machine for setup, changeovers, or wear take-up. Choose a fixed-stroke SC if the stroke length is permanently fixed and you want a simpler, lower-cost cylinder.
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