The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X400-10S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø40mm bore, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X400-10S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the piston's stop position by up to 10 mm without replacing the unit. Its 40 mm bore delivers 628 N of push force at 0.5 MPa, making it a solid mid-range actuator for tasks that need a repeatable, tweakable end point.
A built-in magnet (the -S suffix) runs the full stroke length, so CMSG, DMSG, or EMSG reed and solid-state sensors clamp directly onto the tie-rod barrel for end-of-stroke or mid-stroke position feedback. The cylinder body length A is 185 mm, and the 16 mm diameter piston rod threads M12x1.25 for standard knuckle attachments.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X400-10S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 400 mm |
| Stroke adjustment | Up to 10 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. |
| -10 | 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 10 mm rear screw lets technicians dial in the exact stroke end on a new machine without cutting brackets or adding shims, speeding up initial runoff.
On a packaging line, quickly adjust the push stroke for a different box size by turning the rear screw, avoiding a cylinder swap and minimising downtime.
In clamping or pressing fixtures, the adjustable stroke takes up pad wear over time, maintaining consistent contact force without reprogramming the machine.
Choose the SCJ40 when you need to dial in a precise stop during commissioning or after tooling wear—its 10 mm adjustment screw shortens the stroke end without external hard stops. If you need more force, the SCJ50 pushes 982 N at the same 0.5 MPa; for a lighter, more compact solution, the SCJ32 provides 402 N. This model is a direct replacement for another AirTAC SCJ40X400-10S with a PT port and basic mounting. For a 400 mm stroke, ensure the rod is not subjected to high side loads; if lateral forces are present, add an external linear guide or switch to a guided cylinder. When position sensing is not required, the standard SCJ40X400-10 without the magnet is the equivalent fixed-stroke alternative.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder produces 628 N pushing and 528 N pulling. The push force is higher because the single rod reduces the piston area on the return side. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1280 N.
Yes, if you need the ability to fine-tune the stroke end. The SCJ40X400-10S matches the mounting footprint of an SC40X400 but adds a rear adjusting screw. Ensure your replacement matches the 400 mm nominal stroke, PT port thread, and basic mounting style.
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