The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X190-50S 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, 190mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X190-50S is a 40 mm bore, double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. Its rear-cap screw provides a 50 mm adjustment range, allowing you to fine-tune the 190 mm nominal stroke without removing the cylinder. This model includes a built-in magnet for direct mounting of CMSG/DMSG/EMSG sensors, and delivers 628 N of push force at 0.5 MPa.
With a 16 mm piston rod and PT1/4 ports, this cylinder is suited for applications requiring mid-range force and precise end-position tuning. The body length A(SCJ) is 185 mm, and the adjustable air cushion decelerates the piston smoothly. The maximum standard stroke for this bore is 1200 mm, making this unit a standard, in-stock configuration.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X190-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 190 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. |
| ×190 | 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 screw lets technicians dial in the exact stroke end during initial machine setup, compensating for stack-up tolerances without needing to order a custom fixed-stroke cylinder.
On packaging lines, the adjustable stroke allows operators to quickly reposition a stop gate or pusher for different box sizes, reducing downtime between production runs.
In clamping or pressing fixtures, the stroke end can be gradually extended over time to compensate for pad wear, maintaining consistent clamping force without replacing the tooling.
Choose this 40 mm bore when the 32 mm model's 402 N push force at 0.5 MPa is insufficient, but the larger 50 mm bore's 982 N is more force than your application needs. The SCJ is the correct choice over a fixed-stroke SC when you need to commission a machine, accommodate part tolerances, or adjust for format changes without swapping the cylinder. For a direct replacement, match the 40 mm bore, 190 mm nominal stroke, 50 mm adjust range, PT port thread, and the built-in magnet (-S). If your load requires guided motion to prevent rod bending, consider adding an external guide rail.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The push force is greater because the single piston rod reduces the effective area on the return stroke. At the maximum operating pressure of 0.9 MPa, the push force reaches 1130 N.
A screw in the rear cap sets the retracted stroke end position. Turning the screw shortens the effective stroke by up to 50 mm from the 190 mm nominal maximum. It adjusts only the stroke end, not the cylinder's speed or output force, and does not act as a mechanical lock.
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