The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X375-50S 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, 375mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X375-50S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, allowing you to fine-tune the piston's stop position by up to 50 mm without removing the cylinder from the machine. With a 40 mm bore and a 16 mm piston rod, it delivers 628 N of push force at 0.5 MPa, making it a solid mid-range actuator for tasks that need a repeatable, yet reconfigurable, end point.
This model includes a built-in magnet (-S suffix), so standard CMSG/DMSG/EMSG reed or solid-state sensors can be clamped directly onto the tie-rod barrel for precise end-of-stroke detection. The body length A is 185 mm, and the cylinder uses a PT1/4 port with an M12x1.25 rod thread. The 375 mm nominal stroke is well within the 1200 mm maximum standard stroke for this bore, ensuring it is a standard, readily available configuration.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X375-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 375 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. |
| ×375 | 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 setup, the 50 mm adjustable stroke lets technicians precisely dial in the cylinder's end position to match the exact tooling or workpiece location, eliminating the need to shim or modify hard stops.
Ideal for conveyor systems where the stopping point for different product sizes needs to change. The rear adjusting screw allows a quick, tool-free stroke-end change to accommodate a new box or pallet format.
In clamping fixtures, the adjustable stroke can be used to take up slack as contact pads or the clamped part itself wears down over time, maintaining consistent clamping force without reprogramming a servo.
Choose the SCJ40 when a 40 mm bore's force class is sufficient but the application requires the ability to dial in the exact stroke end during commissioning or changeovers. If you need more force, stepping up to a 50 mm bore SCJ50 provides 982 N of push force at 0.5 MPa. For applications where the stroke is permanently fixed and never needs adjustment, the standard SC40 fixed-stroke cylinder is a simpler, more cost-effective alternative. For a direct replacement, match the 40 mm bore, 375 mm nominal stroke, 50 mm adjust range, PT port thread, and the built-in magnet; this unit is a drop-in fit for another AirTAC SCJ40X375-50S. For a 375 mm stroke, be mindful of side loads. If the rod is not guided by the load, consider adding an external guide rail or switching to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
A screw in the rear cap limits how far the piston can retract. You can shorten the stroke end by up to 50 mm from the nominal 375 mm maximum. It only adjusts the retract end position; the push force remains the full 628 N at 0.5 MPa (1130 N at 0.9 MPa) regardless of the setting.
Yes, this is a genuine AirTAC SCJ40X375-50S. It is a direct dimensional and performance match for any cylinder with the same bore, 375 mm nominal stroke, 50 mm adjust range, PT ports, and a built-in magnet for sensors. Verify your mounting style is basic (no brackets) for a seamless swap.
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