The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X185-30 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. Ø40mm bore, 185mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X185-30 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, giving you up to 30 mm of fine-tuning range on the retract side without replacing the unit. At 0.5 MPa it delivers 628 N push and 528 N pull, making it a capable mid-force actuator for positioning and clamping tasks.
This 40 mm bore tie-rod cylinder uses a 16 mm diameter piston rod and PT1/4 ports, with a 21 mm air cushion at each end for smooth deceleration. Its body length A is 185 mm, and the rear adjusting screw lets operators dial in the exact stroke end position during commissioning or changeover.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X185-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 185 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. |
| ×185 | 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.
Fine-tune the retract position during initial machine setup without swapping cylinders or machining external stops, saving hours of mechanical adjustment.
Adjust the stroke end to take up mechanical wear in tooling or grippers over time, maintaining consistent clamping force and part contact without replacing components.
Quickly adapt the cylinder stroke for different product sizes on a packaging or assembly line, reducing downtime between batches.
Choose the SCJ40 when you need the mid-range force of a 40 mm bore but also require on-machine stroke adjustability. If your application needs more push force, stepping up to the 50 mm bore (SCJ50) provides 982 N at the same 0.5 MPa. For a simpler, fixed-stroke solution where adjustability is not required, the standard SC40 is a lighter and more compact alternative.
A direct replacement must match the 40 mm bore, 185 mm nominal stroke, and 30 mm adjustable range, with PT1/4 ports and basic mounting. For strokes of this length, ensure the rod is guided externally if significant side loads are present, 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 cylinder generates 628 N on the push stroke and 528 N on the pull stroke due to the single-rod design. The maximum push force at 0.9 MPa is 1130 N.
Yes, if you need the added benefit of a 30 mm stroke-end adjustment. It matches the SC40's bore, port size (PT1/4), and rod diameter (16 mm), but the overall body length is slightly longer to house the rear adjusting mechanism. Confirm the A dimension (185 mm) fits your machine.
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