Airtac SCJ50 Standard Cylinder SCJ50X140-30
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X140-30 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, 140mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke140 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X140-30
The SCJ50X140-30 is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly into the rear cap. With a 50 mm bore and a 20 mm piston rod, it delivers 982 N of push force at 0.5 MPa, while the 30 mm rear adjusting screw lets you shorten the effective stroke from the 140 mm nominal maximum without removing the cylinder from the machine.
A 21 mm air cushion decelerates the piston quietly near end of travel, and the PT1/4 port keeps flow rates high for cycle speeds up to 800 mm/s. The tie-rod body (A length 194 mm) is compatible with FA, LB, and TC mounting brackets, giving you a compact, field-configurable actuator for format-change or commissioning tasks.
Airtac SCJ50 Standard Cylinder SCJ50X140-30 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X140-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 140 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 SCJ50X140-30
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×140 | 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 SCJ50X140-30 Is Used
Commissioning & Setup
Field technicians adjust the 30 mm rear screw to fine-tune the end position during initial machine bring-up, eliminating the need to shim or swap fixed-stroke cylinders.
Format Changeover
On packaging or filling lines, operators quickly reset the stroke end for different product sizes without disconnecting air lines or removing the cylinder from the guarded area.
Wear Compensation
The adjustable stop takes up mechanical wear in gripper or clamp linkages over time, maintaining precise end positioning without replacing the actuator.
Is the Airtac SCJ50 Standard Cylinder SCJ50X140-30 the Right Cylinder?
Choose the SCJ50X140-30 when you need to dial in a stroke end position repeatedly on a 50 mm bore platform. If 982 N push at 0.5 MPa is marginal, stepping up to a 63 mm bore (1559 N push) adds force without a large footprint increase; if you need less force and a lighter assembly, the 40 mm bore (628 N push) may suffice. For applications where the stroke is never changed, the fixed-stroke SC50X140 is a simpler, lower-cost alternative.
Direct replacement must match bore (50 mm), nominal stroke (140 mm), 30 mm adjustable range, PT port thread, and the SCJ mounting style. If you are adding a magnet, specify SCJ50X140-30S. For strokes of 300 mm or longer, evaluate side-load and rod deflection; an external guide or a guided cylinder is recommended when the rod supports a transverse load.
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 SCJ50X140-30 FAQ
At 0.5 MPa the cylinder generates 982 N pushing force and 825 N pulling force (the difference is due to the 20 mm single rod). At the maximum operating pressure of 1.0 MPa, push force reaches 1963 N.
Yes, if you need the 30 mm adjustable stroke feature. The SCJ50X140-30 shares the same bore, nominal stroke, port size (PT1/4), and mounting accessories (FA/LB/TC) as the SC series, but the body is slightly longer to house the rear adjusting screw. Ensure your machine clearance accommodates the extra length.
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