The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X120-40S 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 AirTAC SCJ40X120-40S is a double-acting, single-rod pneumatic cylinder that delivers 628 N of push force at 0.5 MPa, giving you a useful mid-range actuator for positioning and clamping tasks. Its defining feature is the rear-cap adjusting screw, which lets you shorten the stroke end by up to 40 mm without removing the cylinder from the machine—ideal for commissioning tweaks or format changes on the fly.
This model includes a built-in magnet (-S suffix), so you can directly mount CMSG, DMSG, or EMSG reed and solid-state sensors on the 40 mm bore tie-rod barrel to confirm piston position. The 16 mm diameter piston rod, PT1/4 port, and 21 mm air cushion work together to provide smooth, controlled motion through the full 120 mm nominal stroke.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X120-40S |
|---|---|
| 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.
Fine-tune the end-stop position during machine build and commissioning. The 40 mm adjustment range allows engineers to dial in the exact stroke needed without fabricating custom mechanical stops.
Quickly adapt a packaging or sorting line to a new product size. The rear screw lets an operator adjust the cylinder's stroke end by up to 40 mm in seconds, minimizing downtime between batches.
In clamping or pressing fixtures, use the adjustable stroke to take up slack as tooling or workpieces wear over time, maintaining consistent contact force without reprogramming the machine.
Choose the SCJ40 when you need the 628 N push force at 0.5 MPa. If your load requires more force, stepping up to the SCJ50 bore provides 982 N of push at the same pressure. For applications where the stroke length is fixed and will never need field adjustment, the standard SC40 fixed-stroke cylinder is a simpler, more cost-effective alternative. This SCJ40X120-40S is a direct replacement for any AirTAC SCJ40 cylinder with a 120 mm nominal stroke, 40 mm adjust range, PT thread, and a magnet sensor option.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force. The maximum push force at 0.9 MPa is 1130 N. The pull force is lower because the 16 mm piston rod reduces the effective piston area on the retract side.
A screw mechanism in the rear cap acts as an internal, adjustable end-stop for the piston. Turning the screw shortens the stroke end position by up to 40 mm from the 120 mm nominal maximum. This adjusts the stopping point only; it does not change the cylinder's force or speed.
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