The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X45-30 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, 45mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X45-30 is a double-acting, single-rod pneumatic cylinder that puts fine stroke tuning directly on the machine. Its rear-cap adjusting screw gives you up to 30 mm of field-adjustable stroke-end reduction, so you can dial in the exact 45 mm maximum stroke without swapping cylinders or adding external hard stops.
With a 16 mm piston rod and a push force of 628 N at 0.5 MPa (1130 N at 0.9 MPa), this 40 mm bore actuator handles moderate positioning and clamping tasks. The body length A(SCJ) is 185 mm, and the adjustable air cushion decelerates the piston smoothly at both ends, protecting the end caps during high-cycle operation.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X45-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 45 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. |
| ×45 | 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 end-of-stroke position during machine commissioning without fabricating custom stops. The 30 mm adjustment range lets technicians quickly optimize the actuator throw for new tooling.
Quickly adapt a diverter gate or pusher to a new box size on a packaging line. The rear screw adjusts the stroke end in seconds, minimizing downtime between product runs.
Take up mechanical play or seal wear in a clamping fixture over time. A simple turn of the adjusting screw restores the precise clamping position without disassembling the linkage.
Choose this 40 mm bore when your application needs roughly 628 N of push force at standard plant air. If you require more force, stepping up to the 50 mm bore (SCJ50) provides 982 N of push at the same 0.5 MPa. For applications that do not require field-adjustable stroke, the fixed-stroke SC40 series offers a simpler, more compact alternative. A direct replacement must match the SCJ40 bore, 45 mm nominal stroke, 30 mm adjust range, PT port thread, and basic mounting style.
Adjustable-stroke checklist
The push force is 628 N at 0.5 MPa and 1130 N at 0.9 MPa. The pull force is lower due to the 16 mm rod area, delivering 528 N at 0.5 MPa. The stroke-adjust screw does not alter the cylinder's force output.
No. As a standard double-acting cylinder, it will drift or drop if air pressure is exhausted or the directional valve is centered. To hold a load without live pressure, you must add an external rod brake, a mechanical lock, or a pilot-operated check valve.
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