The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X225-30S 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. Ø40mm bore, 225mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X225-30S is a 40 mm bore double-acting single-rod cylinder from the AirTAC SCJ family, featuring a 30 mm rear-cap adjusting screw that lets you fine-tune the stroke end position on the machine without swapping the cylinder. Its 16 mm diameter rod delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it a practical choice for mid-range pneumatic tasks where the final stop point needs field adjustment.
This model includes a built-in magnet (-S suffix), so CMSG/DMSG/EMSG reed or solid-state sensors can be clamped directly onto the tie-rod barrel for reliable end-of-stroke sensing. The body length A(SCJ) is 185 mm, and the adjustable air cushion decelerates the piston smoothly. With a PT1/4 port and M12x1.25 rod thread, it drops into standard pneumatic circuits and offers a 21 mm cushion length for consistent end-of-stroke damping.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X225-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 225 mm |
| Stroke adjustment | Up to 30 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.
| 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.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×225 | 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.
The 30 mm adjustable stroke lets technicians dial in the exact stop position during machine commissioning, eliminating the need to shim or reposition the cylinder body for small end-point corrections.
On packaging or assembly lines, quickly adjust the stroke end to accommodate different product sizes or pallet patterns without mechanical rework, reducing changeover time.
In clamping or pressing fixtures, the screw can be advanced slightly over time to compensate for tooling or pad wear, maintaining consistent contact force without replacing the actuator.
Choose the SCJ40X225-30S when you need a 40 mm bore with 628 N of push force at 0.5 MPa and the ability to shorten the stroke end by up to 30 mm for commissioning or format changes. If your load requires more force, step up to the 50 mm bore SCJ series, which provides 982 N of push at the same pressure. For applications that do not need field-adjustable stroke, the fixed-stroke SC40 cylinder is a simpler, more economical alternative.
This cylinder is a direct replacement for another AirTAC SCJ40 adjustable-stroke unit with a 225 mm nominal stroke, 30 mm adjust range, PT ports, basic mounting, and a built-in magnet. At this 225 mm stroke, ensure the rod is not subjected to significant side loads; if lateral forces are present, add an external guide rail or consider a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this 40 mm bore cylinder generates 628 N of push force on the piston side and 528 N of pull force on the rod side. At the maximum operating pressure of 1.0 MPa, the push force reaches 1130 N.
It can replace an SC40 if you need the field-adjustable stroke feature, but the SCJ body is slightly longer to accommodate the rear adjusting screw. Ensure the same bore, port size (PT1/4), and mounting style. For a direct SCJ replacement, match the 225 mm nominal stroke and 30 mm adjust range.
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