The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X50-30H 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, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X50-30H is a 40 mm bore, double-acting, single-rod pneumatic cylinder that lets you fine-tune the stroke end position by up to 30 mm via a rear-cap adjusting screw. With a nominal 50 mm stroke and a 16 mm diameter piston rod, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it a versatile actuator for applications where the end-stop needs dialling in during commissioning or changeover.
This variant is built with Viton (FKM) seals, extending the operating temperature range from the standard -20–70°C up to 0–150°C. The body length A is 185 mm, and it uses a PT1/4 port with an M12x1.25 rod thread. The adjustable cushion decelerates the piston smoothly, while the stroke-end screw provides a hard, repeatable stop without the need for external hardware.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X50-30H |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 50 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. |
| ×50 | 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-stop position during machine installation without swapping cylinders or machining external stops, cutting setup time significantly.
The Viton seals allow reliable operation in ovens or near heat sources up to 150°C, pushing light fixtures or actuating dampers where the stroke must be precisely dialled in.
As tooling or gripper pads wear, the 30 mm adjustment screw can be turned to recover the exact stroke end position, maintaining process consistency without replacing parts.
Choose the SCJ40 when you need to adjust the stroke end on the fly—ideal for format changes or wear take-up. If 628 N of push force at 0.5 MPa is insufficient, step up to the SCJ50, which provides 982 N. For applications that don't require field adjustability, the fixed-stroke SC40 is a simpler, more cost-effective alternative. To replace this unit, match the 40 mm bore, 50 mm nominal stroke, 30 mm adjustment range, PT1/4 port thread, and Viton seal material exactly.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The maximum push force at the 0.9 MPa operating limit is 1130 N. The pull force is lower because the 16 mm rod reduces the effective piston area on the return stroke.
Yes, if you need the ability to adjust the stroke end. The SCJ40X50-30H has the same 40 mm bore, PT1/4 ports, and M12x1.25 rod thread as an SC40, but the body is slightly longer to house the adjusting screw. Ensure the 30 mm adjustment range suits your application.
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