The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X140-50S 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, 140mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X140-50S is a double-acting, single-rod tie-rod cylinder with a 40 mm bore and a nominal 140 mm stroke, fitted with a rear-cap adjusting screw that provides a 50 mm field-adjustable range for fine-tuning the stroke end position. It delivers 628 N of push force at 0.5 MPa (pull is 528 N due to the 16 mm rod), making it a solid mid-range actuator for tasks that need commissioning flexibility or format changeover without swapping the cylinder.
This model includes a built-in magnet (suffix -S), allowing CMSG/DMSG/EMSG sensors to clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The body length A(SCJ) is 185 mm, and the PT1/4 port with M12x1.25 rod thread keeps the fluid path efficient. The adjustable screw only sets the stroke end — it is not a force or speed control — so pair it with a flow control valve for velocity tuning.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X140-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 140 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. |
| ×140 | 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.
During machine bring-up, the 50 mm screw lets technicians precisely set the push stroke end for a gripper or ejector, eliminating the need to shim or swap cylinders when the ideal position is found.
On a packaging line switching between box heights, the adjustable stroke quickly resets the compression plate's travel without mechanical rework, reducing downtime between batches.
In a clamping or pressing station, the screw can be advanced over time to take up mechanical wear on tooling or seals, maintaining consistent clamp force without replacing the actuator.
Choose the SCJ40X140-50S when you need to dial in a stroke between 90 and 140 mm on the machine without dismounting the cylinder. If your load requires more push force, stepping up to the 50 mm bore provides 982 N at 0.5 MPa; if space is tight and 402 N is enough, the 32 mm bore is a lighter alternative. For applications where the stroke is permanently fixed and never needs field tweaking, the standard SC series offers a simpler, cost-effective option. A direct replacement must match the 40 mm bore, 140 mm nominal stroke, 50 mm adjust range, PT1/4 port, and the integrated magnet — only another SCJ40X140-50S will drop in without re-plumbing or re-programming sensors.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, it produces 628 N pushing and 528 N pulling. The maximum push force at 0.9 MPa is 1130 N. The pull force is always lower because the 16 mm rod reduces the effective piston area on the return stroke.
The SCJ has a mechanical screw in the rear cap that lets you shorten the stroke end by up to 50 mm. This is a field adjustment for setting the piston's stop position. It does not change the cylinder's force, speed, or the nominal 140 mm rating — it simply gives you an adjustable hard stop.
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