Airtac SCJ50 Standard Cylinder SCJ50X140-40
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X140-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 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-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X140-40
The SCJ50X140-40 is a double-acting, single-rod pneumatic cylinder that puts 982 N of push force at 0.5 MPa (1767 N at 0.9 MPa) into a compact, field-adjustable package. Its rear-cap adjusting screw provides a 40 mm stroke-end reduction range, letting you fine-tune the piston stop position from 100 mm up to the full 140 mm nominal stroke without swapping the cylinder or adding external hard stops.
Built on the rugged SC tie-rod platform, this 50 mm bore unit uses a 20 mm diameter piston rod, PT1/4 ports, and a 21 mm air cushion to decelerate the load smoothly. The body length A(SCJ) is 194 mm, making it a direct fit for machinery where the stroke needs to be dialed in during commissioning or after tooling wear.
Airtac SCJ50 Standard Cylinder SCJ50X140-40 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X140-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 140 mm |
| Stroke adjustment | Up to 40 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 SCJ50X140-40
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×140 | Nominal (maximum) stroke length in mm. |
| -40 | 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 SCJ50X140-40 Is Used
Commissioning & Setup
The 40 mm adjustment range allows technicians to quickly dial in the exact end-of-stroke position during machine setup, eliminating the need to shim or reposition the cylinder mounting.
Product Changeover
On packaging or assembly lines running multiple product sizes, the adjustable stroke lets operators reset a stop or pusher position in seconds without tools, minimizing downtime between batches.
Wear Compensation
In clamping or pressing fixtures, the screw can be periodically advanced to take up for pad wear or material compression, maintaining consistent clamping force over the tooling's service life.
Is the Airtac SCJ50 Standard Cylinder SCJ50X140-40 the Right Cylinder?
Choose the SCJ50X140-40 when your application requires a stroke that can be precisely trimmed on the machine, such as for format changeovers or to compensate for part tolerance stack-up. If you need more force, stepping up to the 63 mm bore provides 1559 N of push force at the same 0.5 MPa pressure. For a fixed, non-adjustable stroke, the standard SC50 cylinder is a lighter and more economical alternative. A direct replacement must match the 50 mm bore, 140 mm nominal stroke, 40 mm adjust range, PT port thread, and basic mounting style.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ50X140-40 FAQ
The push force is 982 N at 0.5 MPa and 1767 N at the maximum operating pressure of 0.9 MPa. The pull force on the retract stroke is 825 N at 0.5 MPa due to the 20 mm piston rod reducing the effective piston area.
Yes, provided the mounting envelope can accommodate the slightly longer SCJ body. The SCJ50X140-40 is a direct dimensional match for an SCJ cylinder of the same bore and stroke. It is not a drop-in replacement for a shorter fixed-stroke SC cylinder, as the body length A(SCJ) is 194 mm.
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