The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X400-50 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, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X400-50 is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly on the machine. Its rear-cap adjusting screw provides up to 50 mm of adjustment, letting you dial in the exact end position 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 0.5 MPa, making it a solid choice for mid-force applications where commissioning trials or format changes demand quick, repeatable setup.
This 40 mm bore cylinder has a 400 mm nominal stroke and uses an adjustable air cushion (21 mm long) to decelerate the piston smoothly. The body length A(SCJ) is 185 mm, and the maximum standard stroke for this bore is 1200 mm. Operating pressure spans 0.15–1.0 MPa, with a proof pressure of 1.5 MPa, and the standard TPU seals work reliably from -20 to +70 °C.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X400-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 400 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. |
| ×400 | 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.
The 50 mm adjustment screw lets technicians fine-tune the stroke end during initial machine bring-up without fabricating custom stops, cutting cycle time and reducing setup scrap.
In clamping or pressing fixtures, the adjustable stroke compensates for pad wear or material thickness variation over thousands of cycles, maintaining consistent contact force.
On packaging or sorting lines, operators can quickly reset the cylinder's end position for different product sizes, slashing changeover time compared to swapping fixed-stroke cylinders.
Select the SCJ40X400-50 when you need a 400 mm stroke with the ability to shorten the end position by up to 50 mm in the field. If your force requirement is lighter, the 32 mm bore (402 N push at 0.5 MPa) saves space; for heavier loads, step up to the 50 mm bore (982 N push at 0.5 MPa). Because this is a 400 mm stroke, be mindful of side loads—consider an external guide rail or a guided cylinder if the rod must support off-axis weight. A fixed-stroke SC cylinder is a better pick only when the stroke never needs adjustment after installation.
For a direct replacement, match an AirTAC SCJ adjustable-stroke cylinder with a 40 mm bore, 400 mm nominal stroke, and a 50 mm adjustment range (-50). The port thread must be PT, the mounting style must be basic (or match your existing FA/LB/TC bracket), and the magnet option must be absent unless your existing unit carries the -S suffix.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N (the pull force 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.
Yes, if the mounting envelope allows for the slightly longer SCJ body. The SCJ40X400-50 matches the 40 mm bore and 400 mm stroke, but adds a rear adjusting screw for a 50 mm adjustable range. Ensure your port thread (PT), mounting style, and sensor requirements align—this model does not include a magnet, so you would need the -S suffix for CMSG/DMSG sensors.
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