The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X350-30 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, 350mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X350-30 is a double-acting, single-rod pneumatic cylinder with a rear adjusting screw that provides up to 30 mm of stroke-end adjustment, giving you a true field-tunable 320–350 mm working range. With a 40 mm bore and 16 mm piston rod, it delivers 628 N of push force at 0.5 MPa (1130 N at 0.9 MPa), making it a solid mid-force actuator for applications that need commissioning flexibility or periodic end-stop recalibration.
This tie-rod cylinder uses PT1/4 ports, an M12x1.25 rod thread, and a 21 mm air cushion to decelerate the piston quietly. The body length A(SCJ) is 185 mm, and the standard TPU seals handle -20 to +70 °C with filtered air. The rear screw only sets the stroke end position—it does not alter the bore force or speed, and it is not a locking device.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X350-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 350 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. |
| ×350 | 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.
During machine bring-up, the 30 mm rear adjust lets technicians dial in the exact end position for a 350 mm stroke pusher or stop without re-plumbing or swapping cylinders, cutting setup time.
On packaging lines that handle multiple box sizes, the adjustable stroke end quickly resets a 40 mm bore gate or diverter to match a new product width, avoiding mechanical stop changes.
In a woodworking clamp or press fixture, the screw compensates for pad wear over thousands of cycles, maintaining consistent clamp force without reprogramming the PLC or changing the cylinder.
Choose this 40 mm bore when the 32 mm bore's 402 N push at 0.5 MPa is marginal but a 50 mm bore (982 N) would be oversized for your fixture. The SCJ adjustable stroke is the right pick when you expect to fine-tune the end position during commissioning, changeover, or wear take-up; if your stroke is permanently fixed, the standard SC40X350 saves cost. For a drop-in replacement, match the 40 mm bore, 350 mm nominal stroke, -30 adjust range, PT port thread, and basic mounting.
At 350 mm of stroke, rod buckling and side-load bending become real concerns. If the load is not guided externally or the mounting is not perfectly aligned, consider adding an external guide rail or switching to a guided cylinder to protect the rod and bearing from premature wear.
Adjustable-stroke checklist
At 0.5 MPa, push force is 628 N and pull force is 528 N (pull is lower because the 16 mm rod reduces the piston area on the return side). At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N. The adjusting screw does not change these force values.
Yes, if you need the adjustable stroke feature. The SCJ40X350-30 shares the same 40 mm bore, 350 mm nominal stroke, PT1/4 ports, and basic mounting footprint as the SC series. Just confirm the slightly longer body length A(SCJ) of 185 mm fits your machine envelope and that the -30 adjust range covers your stroke-end variation.
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