The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X200-20 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, 200mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X200-20 brings field-adjustable stroke control to the 40 mm bore class, delivering 628 N of push force at 0.5 MPa (1130 N at 0.9 MPa). Its rear-cap adjusting screw provides a 20 mm shortening range, letting you dial in the exact stroke end position during commissioning or after mechanical wear—without dismounting the cylinder or adding external hard stops.
Built on a proven tie-rod platform with a 16 mm diameter piston rod and PT1/4 ports, this double-acting single-rod cylinder includes an adjustable air cushion (21 mm length) for smooth deceleration. The body length A(SCJ) is 185 mm, making it a compact solution when space is tight but stroke precision matters.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X200-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 200 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. |
| ×200 | 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.
Technicians can back out the rear screw to incrementally extend the stroke while aligning tooling, then lock it at the perfect position—no need to swap cylinders or fabricate shims.
On packaging lines, the 20 mm adjust range lets operators quickly reset a pusher or gate stroke for a new box size, minimizing downtime between production runs.
As gripper pads or end-effector tooling wears down, the stroke can be extended slightly via the adjusting screw to maintain consistent contact force and part engagement.
Choose the SCJ40X200-20 when you need to fine-tune a 200 mm stroke by up to 20 mm on the machine. If your force requirement grows, step up to the 50 mm bore SCJ50 series which delivers 982 N push at 0.5 MPa. For applications where the stroke never needs field adjustment, the fixed-stroke SC40X200 reduces complexity and cost. This model is a direct replacement for another AirTAC SCJ40X200-20 with PT ports and basic mounting; ensure the -20 adjust range matches your setup. At 200 mm stroke, rod bending is generally not a concern for axial loads, but if you are pushing an offset load, consider an external guide rail to protect the rod and bearing.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, it generates 628 N pushing and 528 N pulling (the difference is due to the 16 mm single rod). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1280 N.
Yes, the SCJ40X200-20 shares the same bore, port size (PT1/4), and mounting footprint as the SC series. The body is slightly longer to house the adjusting screw, so verify you have clearance at the rear cap. The adjustable stroke is a pure mechanical upgrade for fine-tuning the end position.
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