Airtac SCJ50 Standard Cylinder SCJ50X125-50
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X125-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø50mm bore, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke125 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X125-50
The SCJ50X125-50 is a double-acting, single-rod pneumatic cylinder that puts 982 N of push force at 0.5 MPa behind a 20 mm diameter piston rod. Its defining feature is a rear-cap adjusting screw that lets you shorten the stroke end by up to 50 mm without removing the cylinder, giving you a true field-adjustable working range from 75 mm to the full 125 mm nominal stroke.
Built on the proven SC tie-rod platform, this 50 mm bore unit uses PT1/4 ports and an M16x1.5 rod thread. The adjustable air cushion (21 mm long) decelerates the piston smoothly, and the body length A(SCJ) is 194 mm. At the maximum operating pressure of 0.9 MPa, it delivers 1767 N of push force, suiting it to clamping, pressing, and positioning tasks where the final stroke length must be dialled in during commissioning or changeover.
Airtac SCJ50 Standard Cylinder SCJ50X125-50 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X125-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 50 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 SCJ50X125-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×125 | Nominal (maximum) stroke length in mm. |
| -50 | 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 SCJ50X125-50 Is Used
Commissioning & Setup
Dial in the exact stroke end position during machine bring-up. The 50 mm adjustment range allows engineers to compensate for stack-up tolerances in tooling and fixtures without swapping cylinders.
Product Format Changeover
Quickly adapt a pusher or stop cylinder to a new product size on a packaging or assembly line. Operators can adjust the stroke end stop in seconds to handle different box widths or pallet sizes.
Wear Compensation
As gripper pads, press tools, or brake linings wear down, the rear adjusting screw can be turned to extend the effective stroke, maintaining consistent contact pressure and cycle timing without mechanical rework.
Is the Airtac SCJ50 Standard Cylinder SCJ50X125-50 the Right Cylinder?
Choose the SCJ50 when you need the 50 mm bore's force class—982 N push at 0.5 MPa—and the ability to fine-tune the stroke end. If your application requires a fixed, non-adjustable stroke, the standard SC50 series is a simpler, cost-effective alternative. For higher force, step up to the SCJ63 bore, which provides 1559 N of push at the same pressure. The direct replacement match is another AirTAC SCJ adjustable-stroke cylinder with a 50 mm bore, 125 mm nominal stroke, a 50 mm adjust range, PT port thread, and basic mounting. For strokes of 125 mm, side-loading is generally low, but if the rod must push an unguided load, consider an external guide rail to prevent bending and premature seal wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-50)
- ✓ 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 SCJ50X125-50 FAQ
At the standard 0.5 MPa operating pressure, it generates 982 N of push force and 825 N of pull force. The maximum push force at 0.9 MPa is 1767 N. The pull force is lower because the 20 mm piston rod reduces the effective piston area on the retract side.
Yes, if you need the adjustable stroke feature. The SCJ50X125-50 has the same 50 mm bore, PT1/4 ports, and basic mounting interface as the SC50. The body is slightly longer to house the adjusting screw, but the rod thread (M16x1.5) and cushion design are identical. Ensure the 50 mm adjustment range suits your process.
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