The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X120-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø80mm bore, 120mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X120-20S is an 80 mm bore double-acting single-rod cylinder with a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke-end reduction, letting you fine-tune the 120 mm nominal stroke without changing the cylinder. It delivers 2513 N of push force at 0.5 MPa and 4523 N at 0.9 MPa, using a 25 mm diameter piston rod and PT3/8 ports.
This model includes a built-in magnet (-S suffix), so CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for non-contact position sensing. The body length A(SCJ) is 239 mm, and the adjustable air cushion decelerates the piston smoothly at each end of the stroke.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X120-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 120 mm |
| Stroke adjustment | Up to 20 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT3/8 |
| Rod thread | M20×1.5 |
| 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, 28 mm |
| Max stroke | Up to 1500 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 | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 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. |
|---|---|
| 80 | Bore size in mm. |
| ×120 | Nominal (maximum) stroke length in mm. |
| -20 | 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.
Quickly adjust the end stop by up to 20 mm when switching between product sizes on packaging or labeling machines, eliminating the need for mechanical shims.
Fine-tune the actuator stroke during initial machine build-out to compensate for stack-up tolerances, ensuring perfect alignment with tooling.
Take up mechanical play or seal wear over time by slightly extending the effective stroke, maintaining consistent clamping or pressing force.
Choose the SCJ80X120-20S when you need to dial in the stroke end position during commissioning or format changes on an 80 mm bore platform. If you need more force, step up to the 100 mm bore SCJ which provides 3927 N push at 0.5 MPa; if space is tight, the 63 mm bore delivers 1559 N. For applications that do not require stroke adjustability, a fixed-stroke SC80 cylinder is a simpler alternative. This cylinder is a direct replacement for another AirTAC SCJ80 with a 120 mm nominal stroke, 20 mm adjust range, PT ports, basic mounting, and a magnet.
Adjustable-stroke checklist
At 0.5 MPa it produces 2513 N pushing and 2268 N pulling. The force increases with pressure, reaching 4523 N push at the maximum operating pressure of 0.9 MPa. Because it is a single-rod cylinder, the pull force is lower due to the 25 mm rod area.
No. Like all standard pneumatic cylinders, the SCJ80X120-20S will drift or drop if air pressure is lost or the valve is centered. The adjusting screw only sets the stroke end position and the air cushion only decelerates the piston; neither feature locks the rod. For load holding without live pressure, you must add an external rod lock or a pilot-operated check valve.
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