The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X150-50STC 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, 150mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X150-50STC is a double-acting, single-rod pneumatic cylinder that puts fine stroke-end tuning directly on the machine. Its rear adjusting screw provides a 50 mm field-adjustable range, letting you dial in the exact stop position for commissioning or format changes without swapping the cylinder. The 40 mm bore delivers 628 N of push force at 0.5 MPa, driven by a 16 mm diameter piston rod.
This model is factory-configured with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors, and a centre trunnion (TC) mount that ships with the TCM1 bracket, allowing the cylinder to pivot for swinging loads. The body length A(SCJ) is 185 mm, and the PT1/4 port supplies the dual-action chambers. It operates on 40 µm filtered air from 0.15 to 1.0 MPa.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X150-50STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 150 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. |
| ×150 | 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 adjustable stroke allows technicians to precisely fine-tune the end-stop position during initial machine setup, eliminating the need for trial-and-error shimming or multiple cylinder swaps.
Quickly adjust the stroke end to accommodate different product sizes on a packaging line. The rear screw mechanism makes mechanical format changes fast and repeatable without disassembling the actuator.
In high-cycle clamping or pressing applications, the adjustable stroke can be used to take up mechanical wear in tooling or workpieces over time, maintaining consistent contact without reprogramming controls.
Choose the SCJ40 when you need the 628 N push force at 0.5 MPa from a compact 40 mm bore. If your load demands more force, stepping up to the SCJ50 provides 982 N of push at the same pressure. For applications where the stroke never needs field adjustment, the fixed-stroke SC series offers a simpler, more cost-effective alternative. This SCJ40X150-50STC is a direct dimensional replacement for any AirTAC SCJ cylinder of the same 40 mm bore, 150 mm nominal stroke, 50 mm adjust range, PT port, TC mount, and magnet sensor configuration.
Adjustable-stroke checklist
Being a single-rod cylinder, push and pull forces are different. At 0.5 MPa, the push force is 628 N and the pull force is 528 N. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 128 kgf. The adjusting screw does not change the cylinder's force output.
No. Like all standard pneumatic cylinders, the SCJ40X150-50STC will not hold its position if air pressure is lost or the valve is centered; the piston can drift. The air cushion only decelerates the piston at stroke end, and the stroke-adjust screw only sets the end position. To hold a load without live pressure, you must add an external mechanical lock or a pilot-operated check valve.
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