The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X150-20S 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, 150mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X150-20S delivers 628 N of push force at 0.5 MPa and 528 N on the pull stroke, making it a capable mid-bore actuator for tasks that need a tuneable end position. Its 16 mm diameter piston rod and 21 mm air cushion provide stable deceleration, while the rear adjusting screw lets you shorten the nominal 150 mm stroke by up to 20 mm without removing the cylinder from the machine.
This model includes a built-in magnet (-S suffix), so CMSG, DMSG, or EMSG sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke sensing. The body length A(SCJ) is 185 mm, and the standard PT1/4 port keeps plumbing simple. With a maximum operating thrust of 1130 N at 0.9 MPa, it handles clamping, pressing, and positioning jobs where the final stroke length needs on-site fine-tuning.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X150-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 150 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.
| 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. |
| ×150 | 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.
Fine-tune the stroke end position by up to 20 mm during initial machine setup, eliminating the need to shim or reposition the cylinder body.
Adjust the rear screw to take up mechanical play in tooling or gripper jaws over time, maintaining consistent clamping force without replacing the actuator.
Quickly adapt the stopping point for pushers or diverters when switching between product sizes on a packaging line, using the built-in magnet for position confirmation.
Choose the SCJ40 bore when your application needs roughly 628 N of push force at standard shop air. If you require more force, stepping up to the SCJ50 bore gives you 982 N of push at the same 0.5 MPa pressure. For applications that do not require stroke adjustment, the fixed-stroke SC40 series offers a simpler, lower-cost alternative. When replacing an existing SCJ40X150-20S, match the bore, nominal 150 mm stroke, 20 mm adjust range, PT1/4 thread, and the magnet option to maintain sensor compatibility. For strokes of 150 mm, rod deflection is typically not a concern under axial loading, but any significant side load should be managed with an external guide rail.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder provides 628 N of push force and 528 N of pull force. The maximum push force at the 0.9 MPa operating limit is 1130 N. Because it is a single-rod cylinder, the pull force is always lower due to the rod area.
A screw in the rear cap sets the stroke end position. You can shorten the 150 mm nominal stroke by up to 20 mm in the field. This adjusts only the mechanical stop point—it does not change the cylinder's force or speed.
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