The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X75-40STC 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, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X75-40STC 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 40 mm of adjustment, letting you dial in the exact 75 mm maximum stroke 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 versatile actuator for tasks that need frequent format changes.
This model is factory-equipped 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 (order code F-SC40TC). The trunnion allows the cylinder to pivot, absorbing misalignment in swinging or articulating linkages. The adjustable air cushion decelerates the piston smoothly at both ends, and the TPU seals provide reliable operation from -20 to +70 °C.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X75-40STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 75 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. |
| ×75 | 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.
Adjust the push stroke end by up to 40 mm to handle different box heights on a case erector or pack-off station, eliminating manual changeover of hard stops.
Fine-tune the clamp position for varying workpiece thicknesses in a CNC fixture or welding jig, ensuring consistent holding force without crushing the part.
Set the precise gate opening on a conveyor diverter for different product widths, using the trunnion mount to handle the pivoting motion of the gate linkage.
Choose the SCJ40 when your application requires a mid-range force actuator with the flexibility to change the stroke end position on the fly. The 40 mm bore provides 628 N of push force at 0.5 MPa, a solid step up from the 32 mm bore’s 402 N. If your load demands more force, the 50 mm bore delivers 982 N. For fixed-stroke applications where adjustment is never needed, the standard SC series is a simpler, more economical choice.
This SCJ40X75-40STC is a direct replacement for any AirTAC SCJ adjustable-stroke cylinder with a 40 mm bore, 75 mm nominal stroke, 40 mm adjustment range, PT ports, a TC centre trunnion mount, and a magnetic piston. Always match the full configuration to ensure proper fit and sensor compatibility. For strokes of 300 mm or more, evaluate side-loading on the 16 mm rod and consider an external guide or a guided cylinder to prevent rod bending.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 628 N and the pull force is 528 N. The maximum push force at 0.9 MPa is 1130 N. Because it is a single-rod cylinder, the push force is greater than the pull force due to the area of the 16 mm rod.
A rear-cap adjusting screw lets you shorten the stroke end by up to 40 mm from the nominal 75 mm maximum. It is a direct mechanical stop, not a speed or force control. This model is a perfect replacement for any AirTAC SCJ40X75-40 cylinder configured with a magnet, TC centre trunnion mount, and PT ports.
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