Airtac SCJ50 Standard Cylinder SCJ50X250-30
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X250-30 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, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke250 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X250-30
This SCJ50X250-30 adjustable-stroke cylinder delivers a push force of 982 N at 0.5 MPa, making it a robust solution for mid-range pneumatic applications. The defining feature is its rear-cap adjusting screw, which provides a 30 mm field-adjustable range to precisely set the stroke end position without swapping the cylinder or adding external hard stops.
Built on a 50 mm bore with a 20 mm piston rod and PT1/4 ports, this tie-rod cylinder uses an air cushion length of 21 mm for smooth deceleration. The body length A(SCJ) is 194 mm, providing a compact envelope for its 250 mm nominal stroke. It operates within a standard pressure range of 0.15 to 1.0 MPa and a speed range of 30 to 800 mm/s.
Airtac SCJ50 Standard Cylinder SCJ50X250-30 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X250-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 250 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 SCJ50X250-30
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×250 | 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 SCJ50X250-30 Is Used
Commissioning & Setup
Technicians can dial in the exact 250 mm stroke end-stop on a new assembly line using the 30 mm adjustment screw, eliminating the need to fabricate custom shims or mechanical stops.
Product Format Changeover
On a packaging line, the stroke can be quickly shortened by up to 30 mm to accommodate a different box size, reducing changeover time without replacing the 50 mm bore cylinder.
Wear Compensation
In a clamping or pressing operation, the adjustable stroke can be extended slightly over time to compensate for wear on tooling or contact surfaces, maintaining consistent clamp force with the 982 N output.
Is the Airtac SCJ50 Standard Cylinder SCJ50X250-30 the Right Cylinder?
Choose the SCJ50X250-30 when your application requires fine-tuning the end-of-stroke position during commissioning or for format changes. If you need a higher force output, stepping up to the 63 mm bore delivers 1559 N of push force at the same 0.5 MPa pressure. For applications that do not require stroke adjustment, the fixed-stroke SC50 series is a more economical alternative.
To replace this model, match the 50 mm bore, 250 mm nominal stroke, and 30 mm adjustment range. Ensure the port thread is PT and the mounting style is basic. For strokes of this length, be mindful of side loading on the 20 mm rod; if the load is not guided externally, consider adding a guide rod or switching to a guided cylinder to prevent rod bending and premature seal wear.
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 SCJ50X250-30 FAQ
At an operating pressure of 0.5 MPa, the push force is 982 N and the pull force is 825 N. The pull force is lower due to the area of the 20 mm piston rod. At the maximum operating pressure of 0.9 MPa, the push force reaches 1767 N.
A screw mechanism in the rear cap limits how far the piston can retract. By turning this screw, you can shorten the retracted stroke end by up to 30 mm from the nominal 250 mm. It is a mechanical stop for position control, not a force or speed regulator.
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