The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X75-40S 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. Ø50mm bore, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X75-40S is a 50mm bore, single-rod double-acting pneumatic cylinder with a rear adjusting screw that provides up to 40mm of field-adjustable stroke end reduction. This allows machine builders to fine-tune the piston stop position without changing the cylinder or adding external hard stops. It delivers 982 N of push force at 0.5 MPa, with a 20mm diameter piston rod and PT1/4 ports.
This model includes a built-in magnet (-S suffix), enabling direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors along the barrel for precise end-of-stroke or mid-stroke position feedback. The cylinder body length (A dimension) is 194mm, and it features an adjustable air cushion for smooth deceleration. It is a genuine AirTAC product, ideal for applications where stroke length needs to be dialed in during commissioning or changeover.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X75-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 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 | M16×1.5 |
| 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 | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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. |
|---|---|
| 50 | 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.
The 40mm adjustment range lets technicians precisely dial in the actuator stroke end on a new assembly line without swapping shims or hard stops, speeding up initial machine bring-up.
Quickly adapt a pusher or diverter stroke for different box or product sizes on a packaging line. The rear screw is easily accessible for operators to make fast mechanical adjustments between batches.
In clamping or pressing fixtures, the adjustable stroke end can be periodically advanced to compensate for tooling or pad wear, maintaining consistent clamping force and position over time without replacing the cylinder.
Choose this SCJ50 series when you need a robust mid-range cylinder with the flexibility to adjust the stroke end point by up to 40mm on the machine. If your force requirement is lower, stepping down to a 40mm bore reduces push force to 628 N at 0.5 MPa. For higher force, the 63mm bore provides 1559 N. A fixed-stroke SC50 cylinder is a better choice if the stroke length is permanently fixed, as it is simpler and more cost-effective. This SCJ50X75-40S is a direct replacement for another AirTAC SCJ50 cylinder of the same 75mm nominal stroke, 40mm adjust range, PT port thread, and magnet option. For strokes of 300mm or more, consider an external guide or a guided cylinder to protect the 20mm rod from side-load bending.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder provides a push force of 982 N and a pull force of 825 N. The push force is greater than the pull force because the single piston rod reduces the effective area on the return stroke. The maximum push force at the 0.9 MPa operating limit is 1767 N.
No, like all standard double-acting pneumatic cylinders, the SCJ50X75-40S will not hold its position if air pressure is lost or the control valve is centered. The piston can drift or drop under load. To safely hold a load without live pressure, you must add an external mechanical lock, a rod brake, or a pilot-operated check valve in the circuit.
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