The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X120-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø40mm bore, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X120-40 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 40 mm adjustment range, letting you fine-tune the stroke end position without removing the cylinder or adding external hard stops—ideal for commissioning trials and format changeovers on packaging or assembly lines.
This double-acting, single-rod cylinder uses a 16 mm diameter piston rod and PT1/4 ports, with a 21 mm air cushion at each end for smooth deceleration. The SCJ body length A measures 185 mm, and the tie-rod construction keeps service straightforward. The standard stroke of 120 mm is well within the 1200 mm maximum for this bore, so lead times are typically short.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X120-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 120 mm |
| Stroke adjustment | Up to 40 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. |
| -40 | 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.
Dial in the exact push stroke on a new assembly station using the 40 mm rear screw adjustment, eliminating the need to shim or reposition the cylinder body during initial machine bring-up.
Quickly adjust the stroke end when a packaging line switches between different box sizes, using the SCJ40X120-40's screw to set the new push distance without tools or cylinder swaps.
Take up mechanical wear in a clamping or pressing fixture over time by advancing the stroke end screw in small increments, maintaining consistent contact force without replacing the actuator.
Step up to the 50 mm bore SCJ if your application needs more push force (982 N at 0.5 MPa); step down to the 32 mm bore (402 N) when a compact footprint matters more. Choose this adjustable-stroke SCJ over a fixed-stroke SC when you need to dial in the exact stroke end on the machine—the 40 mm range covers most setup variations. If the load creates a bending moment on the rod, pair the cylinder with an external guide rail or switch to a guided cylinder. For a direct replacement, match the 40 mm bore, 120 mm nominal stroke, 40 mm adjust range, PT port thread, basic mounting, and no magnet.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N (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. Always size your cylinder based on the required working pressure and a suitable safety factor.
The rear-cap screw limits how far the piston can extend, effectively shortening the stroke end by up to 40 mm from the 120 mm nominal maximum. It is a stroke-end position setter, not a force or speed control. The screw is not designed to absorb high-impact loads repeatedly—use the built-in 21 mm air cushion for deceleration and an external positive stop for high-cycle hard-stop applications.
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