Airtac SCJ50 Standard Cylinder SCJ50X225-75
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X225-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø50mm bore, 225mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke225 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X225-75
The SCJ50X225-75 delivers a nominal 225 mm stroke with a 75 mm rear adjusting screw, letting you fine-tune the stroke end position anywhere from 150 mm to 225 mm without swapping the cylinder. With a 50 mm bore and 20 mm piston rod, it generates 982 N of push force at 0.5 MPa and up to 1767 N at 0.9 MPa, making it a strong mid-range actuator for applications where the end-stop needs regular tweaking.
This double-acting, single-rod cylinder uses PT1/4 ports and an M16x1.5 rod thread. Its 21 mm air cushion at each end decelerates the piston smoothly, and the tie-rod construction keeps service straightforward. The body length A(SCJ) is 194 mm, slightly longer than a fixed-stroke SC to house the adjusting mechanism.
Airtac SCJ50 Standard Cylinder SCJ50X225-75 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X225-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 225 mm |
| Stroke adjustment | Up to 75 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 SCJ50X225-75
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×225 | Nominal (maximum) stroke length in mm. |
| -75 | 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 SCJ50X225-75 Is Used
Format Changeover on Packaging Lines
Adjust the 75 mm screw to quickly reset the pusher stroke end when switching between box sizes, eliminating the need to swap out the cylinder or reposition mechanical hard stops.
Commissioning & Proof-of-Concept Rigs
Fine-tune the stroke end in small increments during machine bring-up. The 225 mm nominal stroke gives generous working range, while the screw lets you dial in the exact stop position without re-machining brackets.
Wear Compensation in Clamping Fixtures
As clamp pads or tooling wear down over time, the 75 mm adjustment range lets operators restore the correct clamping stroke end in seconds, maintaining consistent part holding force without disassembly.
Is the Airtac SCJ50 Standard Cylinder SCJ50X225-75 the Right Cylinder?
Choose the SCJ50X225-75 when you need a 50 mm bore's force class (982 N push at 0.5 MPa) but must dial in the stroke end during commissioning or changeover. If your load requires more push, step up to the 63 mm bore (1559 N at 0.5 MPa); for a lighter, more compact solution, the 40 mm bore provides 628 N. If the stroke never needs field adjustment, the fixed-stroke SC50 is a simpler, cost-effective alternative.
For a drop-in replacement, match the 50 mm bore, 225 mm nominal stroke, 75 mm adjust range, PT1/4 port thread, and basic mounting. Since the stroke exceeds 200 mm, check for side loads—if the rod sees any lateral force, add an external linear guide or consider 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 (-75)
- ✓ 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 SCJ50X225-75 FAQ
The cylinder delivers 982 N pushing force and 825 N pulling force at 0.5 MPa. At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N. The rear adjusting screw only sets the stroke end position within a 75 mm range; it does not alter the bore diameter, piston area, or output force.
Yes, this is a direct form-and-function replacement for any AirTAC SCJ50 adjustable-stroke cylinder with a 225 mm nominal stroke and 75 mm adjust range, provided the port thread is PT. Ensure the mounting style matches—this basic version has no bracket, so order an FA, LB, or TC mount kit separately if your existing cylinder uses one.
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