The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X120-30S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø50mm bore, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X120-30S is a double-acting, single-rod pneumatic cylinder with a 50 mm bore and a 120 mm nominal stroke, field-adjustable by up to 30 mm via the rear-cap screw. Delivering 982 N of push force at 0.5 MPa, this model includes a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors, enabling precise end-of-stroke detection without external brackets.
This 50 mm bore cylinder uses a 20 mm diameter piston rod, PT1/4 ports, and an M16x1.5 rod thread. The adjustable air cushion decelerates the piston over the final 21 mm of travel, and the body length A(SCJ) is 194 mm. It operates on 40 µm filtered air from 0.15 to 1.0 MPa and is a genuine AirTAC component built for reliable, repeatable stroke tuning.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X120-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 120 mm |
| Stroke adjustment | Up to 30 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. |
| ×120 | Nominal (maximum) stroke length in mm. |
| -30 | 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 30 mm adjustment range lets technicians dial in the exact stop position for a new machine setup without fabricating custom hard stops, speeding up factory acceptance testing.
Quickly adapt a diverter gate's throw distance when switching between product sizes on a packaging line, minimizing downtime with a simple screw adjustment.
In clamping or pressing fixtures, the adjustable stroke can be extended over time to compensate for tooling or pad wear, maintaining consistent clamping force without replacing parts.
Choose the SCJ50X120-30S when you need to fine-tune the stroke end position during commissioning or changeovers without swapping the cylinder. If your force requirement is lower, stepping down to a 40 mm bore (628 N push at 0.5 MPa) can reduce air consumption, while a step up to 63 mm (1559 N push) provides a significant force increase for heavier loads. For applications with a fixed, unchanging stroke, the standard SC series offers a simpler, more cost-effective alternative.
This model is a direct replacement for any AirTAC SCJ50X120-30S with a PT port, basic mount, and magnetic piston. If your load creates significant side forces, especially with this 120 mm stroke, consider adding an external guide rail or switching to a guided cylinder to protect the rod bearing from premature wear.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. The maximum push force at the 0.9 MPa operating limit is 1767 N. The pull force is lower because the piston rod reduces the effective area on the return stroke.
A screw in the rear cap acts as an internal, adjustable end-stop for the piston. Turning the screw changes the retracted stroke end position by up to 30 mm, allowing you to shorten the stroke from the nominal 120 mm without affecting the cylinder's force or speed capabilities.
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