The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X350-75S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø40mm bore, 350mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X350-75S is a double-acting, single-rod pneumatic cylinder with a 40 mm bore and a nominal stroke of 350 mm, delivering 628 N of push force at 0.5 MPa. Its defining feature is the rear-cap adjusting screw, which provides up to 75 mm of field-adjustable stroke-end reduction, allowing machine builders to fine-tune the piston's stopping position without swapping the cylinder or adding external hard stops.
This model includes a built-in magnet, enabling direct mounting of CMSG, DMSG, or EMSG sensors along the tie-rod barrel for precise, non-contact position sensing. The 16 mm diameter piston rod and PT1/4 ports handle standard pneumatic flows, while the adjustable air cushion at each end decelerates the load smoothly. The body length A(SCJ) is 185 mm, making it a compact solution for commissioning trials and format changeovers.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X350-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 350 mm |
| Stroke adjustment | Up to 75 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. |
| ×350 | Nominal (maximum) stroke length in mm. |
| -75 | 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.
During machine commissioning, the 75 mm adjust range lets technicians precisely set the end-of-stroke position for a 40 mm bore actuator without iterative disassembly, speeding up the final alignment of pushers or clamps.
On packaging lines handling multiple product sizes, the SCJ40X350-75S allows operators to quickly adjust the stroke of a diverter or stop gate by up to 75 mm, minimizing downtime between production runs.
In assembly fixtures, the adjustable stroke end can be used to take up mechanical wear in tooling or contact surfaces over time, maintaining consistent pressing depth without replacing the cylinder.
Choose the SCJ40 when you need the 628 N push force of a 40 mm bore at 0.5 MPa and the ability to dial in the stroke end by up to 75 mm on the machine. If your application requires more force, stepping up to a 50 mm bore SCJ provides 982 N of push force at the same pressure. For a fixed, non-adjustable stroke, the standard SC series is a simpler, more cost-effective alternative. When replacing an existing unit, ensure a match on the 40 mm bore, 350 mm nominal stroke, 75 mm adjust range, PT port thread, and the -S magnet option.
At a 350 mm stroke, be mindful of side-loading on the 16 mm rod. If the load is not guided externally, rod deflection can accelerate seal wear. Use an external guide rail or consider a guided cylinder assembly to absorb transverse forces and protect the rod bearing.
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 return stroke.
Yes, provided the bore (40 mm), nominal stroke (350 mm), port thread (PT1/4), and mounting style match. The SCJ40X350-75S has a longer body to house the adjusting screw, so verify the installation envelope. You will also gain the ability to fine-tune the stroke end by up to 75 mm and use magnetic sensors thanks to the -S option.
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