Airtac SCJ40 Standard Cylinder SCJ40X225-20S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X225-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø40mm bore, 225mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke225 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X225-20S
The SCJ40X225-20S is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly in your hands. With a 40 mm bore and a nominal 225 mm stroke, it delivers 628 N of push force at 0.5 MPa, while the rear adjusting screw lets you shorten the stroke end by up to 20 mm without removing the cylinder—ideal for commissioning tweaks or format changeovers.
This model includes a built-in magnet (-S), so you can clamp CMSG/DMSG/EMSG reed or solid-state sensors directly onto the tie-rod barrel for reliable end-of-stroke detection. The 16 mm diameter piston rod and PT1/4 ports keep it compatible with standard AirTAC SCJ accessories, and the 21 mm air cushion at each end provides smooth deceleration across its 30-800 mm/s speed range.
Airtac SCJ40 Standard Cylinder SCJ40X225-20S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X225-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 225 mm |
| Stroke adjustment | Up to 20 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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 SCJ40 Standard Cylinder SCJ40X225-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×225 | Nominal (maximum) stroke length in mm. |
| -20 | 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 SCJ40 Standard Cylinder SCJ40X225-20S Is Used
Commissioning & Setup
Dial in the exact stroke end position during machine commissioning with the 20 mm adjustment screw, eliminating the need to shim or reposition the cylinder body.
Product Changeover
Quickly adapt a pusher or diverter station to a new product width on a packaging line by adjusting the stroke end, reducing downtime between production runs.
Wear Compensation
Take up mechanical play or seal compression over time in a clamping or pressing fixture by advancing the stroke end screw, maintaining consistent contact force.
Is the Airtac SCJ40 Standard Cylinder SCJ40X225-20S the Right Cylinder?
Step up to the SCJ50 bore for 982 N of push force at 0.5 MPa if this 40 mm cylinder’s 628 N is marginal for your load. For applications where the stroke never needs field adjustment, a fixed-stroke SC40X225 is a simpler, slightly shorter alternative. This SCJ40X225-20S is a direct dimensional replacement only for another AirTAC SCJ40 with a 225 mm nominal stroke, a 20 mm adjust range, PT ports, and the -S magnet option.
At a 225 mm stroke, rod deflection under side load is a real consideration. Ensure the load is guided externally or consider a guided cylinder if the rod tip must support any lateral force, to prevent premature seal wear and rod bending.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ 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 SCJ40 Standard Cylinder SCJ40X225-20S FAQ
A screw in the rear cap limits how far the piston can retract. By turning it, you can shorten the retracted stroke end by any amount up to 20 mm. It sets the physical stop position; it does not adjust force or speed. The full 225 mm stroke is available when the screw is fully backed out.
At 0.5 MPa, push force is 628 N and pull force is 528 N. At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N. The pull force is lower because the 16 mm piston rod reduces the effective area on the return side.
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