The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X175-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø40mm bore, 175mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X175-50 is a 40 mm bore, double-acting single-rod pneumatic cylinder that puts field-adjustable stroke control directly on the machine. Its rear-cap adjusting screw provides up to 50 mm of stroke-end reduction, letting you fine-tune the 175 mm nominal stroke without swapping the cylinder or adding external hard stops. The 16 mm diameter piston rod and PT1/4 ports deliver a push force of 628 N at 0.5 MPa, rising to 1130 N at the 0.9 MPa maximum operating pressure.
Built on the proven SC tie-rod platform, this SCJ variant adds a compact adjusting mechanism that adds minimal length to the standard 185 mm body dimension. The adjustable air cushion decelerates the piston smoothly at both ends, and the cylinder operates reliably on 40 µm filtered air across a -20 to +70 °C temperature range. It is a practical choice when commissioning trials, format changeovers, or wear take-up demand on-the-fly stroke trimming.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X175-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 175 mm |
| Stroke adjustment | Up to 50 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. |
| ×175 | Nominal (maximum) stroke length in mm. |
| -50 | 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.
During machine bring-up, the 50 mm adjustment range lets technicians dial in the exact end position for a 40 mm bore actuator without iterative cylinder swaps, speeding up line start.
On packaging or assembly conveyors handling multiple product sizes, operators can quickly reset the stroke end to match a new box height or part dimension using only a wrench on the rear screw.
In clamping or pressing fixtures where tooling or pads wear over time, the adjustable stroke end takes up the slack, maintaining consistent contact force without reprogramming the PLC or adding shims.
Step up to the 50 mm bore SCJ50 series if your application needs more force—the 50 mm bore delivers 982 N of push at 0.5 MPa compared to this 40 mm model's 628 N. For lighter, more compact installations, the 32 mm bore SCJ32 provides 402 N push at the same pressure. If your stroke is fixed and you never need field adjustment, the standard SC40 fixed-stroke cylinder offers a simpler, slightly shorter package. For a direct replacement, match an SCJ40 with a 175 mm nominal stroke, 50 mm adjustment range, PT ports, and the same basic mounting configuration. At 175 mm stroke, rod deflection under side load is generally manageable, but if your tooling imposes significant lateral force, consider an external guide rail or a guided cylinder to protect the rod bearing and seal.
Adjustable-stroke checklist
At 0.5 MPa, the 40 mm bore generates 628 N of push force and 528 N of pull force (the pull is lower because the 16 mm rod reduces the effective piston area on the return stroke). At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N.
The rear-cap screw mechanically limits how far the piston can retract, shortening the stroke end by up to 50 mm from the 175 mm nominal maximum. It sets a physical end stop only—it does not lock the piston in place. If air pressure is lost or the valve centres, the rod can drift. For position holding without live pressure, add an external rod lock or pilot-operated check valve.
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