The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X275-50S 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, 275mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X275-50S delivers 628 N of push force at 0.5 MPa, making it a capable mid-range actuator for tasks that demand on-the-fly stroke tuning. Its 50 mm rear adjusting screw lets you dial in the exact stroke end position without swapping the cylinder, which is invaluable during commissioning or format changes.
This model features a 16 mm piston rod, PT1/4 ports, and a 21 mm air cushion for smooth deceleration. The built-in magnet (denoted by the -S suffix) allows direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection. The body length A(SCJ) is 185 mm, providing a compact footprint for its 275 mm nominal stroke.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X275-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 275 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. |
| ×275 | 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 adjustment range lets technicians precisely dial in the actuator's end stop during initial machine setup, eliminating the need for shims or external hard stops.
Ideal for conveyor lines handling different product sizes, where the stopping position must be quickly changed over between batches without mechanical rework.
In clamping or pressing fixtures, the screw can be advanced over time to compensate for tooling or pad wear, maintaining consistent clamping force without replacing the cylinder.
Choose the SCJ40X275-50S when you need to fine-tune a 275 mm stroke by up to 50 mm. If your force requirements increase, stepping up to the SCJ50 bore provides 982 N of push force at the same 0.5 MPa pressure. For applications where the stroke is permanently fixed after setup, a standard SC40X275 fixed-stroke cylinder is a simpler, more cost-effective alternative. To replace this unit, match the 40 mm bore, 275 mm nominal stroke, 50 mm adjust range, PT ports, and the -S magnet option. The sensor-ready design is a direct drop-in for any existing SCJ40 setup using the same sensor type.
Adjustable-stroke checklist
A screw in the rear cap lets you shorten the nominal 275 mm stroke by up to 50 mm. This sets the piston's retracted end position, giving you an adjustable working stroke between 225 mm and 275 mm without changing the cylinder body.
At 0.5 MPa, it generates 628 N of push force and 528 N of pull force. The maximum push force at the 0.9 MPa operating limit is 1130 N. The pull force is lower because the 16 mm rod reduces the effective piston area on the return stroke.
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