The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X120-30S 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, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X120-30S is a double-acting, single-rod pneumatic cylinder that puts stroke-end tuning directly into your hands. Its rear-cap adjusting screw provides a 30 mm adjustable range, letting you dial in the exact stop position on the fly without swapping the cylinder or adding external hard stops. With a 16 mm piston rod and PT1/4 ports, it delivers 628 N of push force at a standard 0.5 MPa supply.
This model includes a built-in magnet (-S suffix), so you can clamp CMSG, DMSG, or EMSG reed and solid-state sensors directly onto the tie-rod barrel for precise, non-contact end-of-stroke sensing. The 21 mm air cushion at each end decelerates the piston smoothly, and the TPU seals keep it running reliably from -20 to +70 °C. It is a practical choice for commissioning trials, format changeovers, or any application where the mechanical stop needs fine adjustment over time.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X120-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 120 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. |
| ×120 | 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-arm tooling position during robotic cell commissioning. The 30 mm screw adjustment lets integrators dial in the exact stop point after the gripper is mounted, compensating for bracket tolerances without re-plumbing.
Quickly adjust a pusher or diverter stroke on a packaging line when switching between box sizes. The operator turns the rear screw to shorten the stroke end by up to 30 mm, avoiding the downtime of a full cylinder swap.
On a clamping or pressing fixture, use the adjustable stroke to take up mechanical wear in the tooling over thousands of cycles. A simple turn of the screw restores the original clamping gap without shims.
Choose this 40 mm bore when your application needs around 628 N of push force at 0.5 MPa. If you require more force, stepping up to the 50 mm bore provides 982 N of push at the same pressure. For a fixed, non-adjustable stroke, the standard SC series is a direct alternative. To replace this unit, match an SCJ cylinder with a 40 mm bore, 120 mm nominal stroke, and a 30 mm adjustment range, ensuring the PT port thread and the -S magnet option are specified. The basic mounting style requires no additional brackets, but FA front flange or LB foot mounts are available if your machine layout changes.
Adjustable-stroke checklist
At 0.5 MPa, it generates 628 N pushing and 528 N pulling. The push force is higher because the rod reduces the effective piston area on the return side. At the maximum operating pressure of 0.9 MPa, the push force reaches 1130 N.
Yes, provided the bore, nominal stroke, and port size match. The SCJ40X120-30S fits the same mounting footprint as the standard SC series, but adds a rear adjusting screw. Ensure you have clearance for the longer body length and order the same magnet and mounting type if you are reusing sensors or brackets.
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