The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X180-40S 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, 180mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X180-40S is a double-acting, single-rod pneumatic cylinder that puts stroke-end tuning directly in your hands via a rear-cap adjusting screw, offering a 40 mm adjustment range on a nominal 180 mm stroke. With a 20 mm piston rod and PT1/4 ports, it delivers 982 N of push force at 0.5 MPa, scaling to 1767 N at 0.9 MPa, making it a capable workhorse for mid-range linear tasks.
This model includes a built-in magnet (-S), allowing CMSG/DMSG/EMSG solid-state or reed sensors to clamp directly onto the tie-rod barrel for reliable, non-contact end-of-stroke detection. The body length A(SCJ) is 194 mm, and the adjustable air cushion decelerates the piston smoothly, suiting applications where the stop position must be dialled in during commissioning or changed between product runs.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X180-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 180 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. |
| ×180 | 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 40 mm rear screw lets technicians dial in the exact retract stop position during initial machine build-out, compensating for stack-up tolerances in welded frames or custom tooling without re-machining mounts.
On packaging lines that switch between box sizes, the adjustable stroke quickly resets the pusher end-point, eliminating the need for mechanical hard-stops and reducing changeover time between product runs.
In clamping or pressing fixtures where gripper pads wear down over time, the stroke can be incrementally extended via the adjusting screw to maintain consistent contact force without replacing the entire cylinder.
Choose the SCJ50 bore when your application needs the 982 N push force at standard plant air; if you need more force, stepping up to the 63 mm bore provides 1559 N of push at the same 0.5 MPa pressure. The 40 mm adjustment range is ideal for taking up mechanical wear on tooling or fine-tuning the end position after installation without swapping the cylinder. For applications where the stroke is fixed and an adjusting screw is unnecessary, the standard SC50 fixed-stroke cylinder is a simpler, cost-effective alternative.
For a drop-in replacement, match the SCJ50 bore, the 180 mm nominal stroke, the 40 mm adjustment range, PT port thread, and the integrated magnet. This cylinder mounts with basic tie-rod nuts; if a pivoting motion is required, the TC centre trunnion with TCM1 bracket is the correct accessory from the SCJ mounting subset.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder generates 982 N of push force and 825 N of pull force. At the maximum operating pressure of 1.0 MPa, the push force reaches 1964 N. The pull force is lower because the 20 mm piston rod reduces the effective piston area on the retract side.
Yes, if you need the ability to adjust the stroke end. The SCJ50X180-40S shares the same bore, port size (PT1/4), and rod dimensions as the SC50, but the rear cap includes an adjusting screw that shortens the stroke by up to 40 mm. Ensure your mounting arrangement has clearance for the slightly longer SCJ body.
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