The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X189-20 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, 189mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The AirTAC SCJ80X189-20 is an 80 mm bore double-acting single-rod pneumatic cylinder featuring a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke-end reduction. This allows precise fine-tuning of the piston stop position without replacing the cylinder or adding external hard stops, making it ideal for commissioning and format changeovers. The cylinder body length (A dimension) is 239 mm, and it uses a 25 mm diameter piston rod with PT3/8 ports.
With a theoretical push force of 2513 N at 0.5 MPa and 4523 N at the maximum operating pressure of 0.9 MPa, this model delivers substantial force for medium-to-heavy-duty applications. The pull force is slightly lower at 2268 N at 0.5 MPa due to the rod area. The adjustable air cushion decelerates the piston smoothly at both ends, and the 189 mm stroke is well within the 1500 mm maximum standard stroke for this bore size.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X189-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 189 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. |
| ×189 | 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.
Fine-tune the actuator end position during initial machine commissioning to compensate for tooling or fixture tolerances without re-machining mounts.
Quickly adjust the stroke for different product sizes on a packaging or sorting line by turning the rear screw, minimizing downtime between batches.
Take up mechanical play or seal wear over time in clamping or pressing fixtures to maintain consistent contact pressure and position.
Select the SCJ80X189-20 when you need to dial in the exact stroke end position during setup or for different product runs without swapping the cylinder. If you require a higher force output, the next step up is the 100 mm bore, which provides 3927 N of push force at 0.5 MPa. For applications where the stroke length is fixed and an adjuster is not needed, the standard SC80X189 fixed-stroke cylinder is a more economical alternative. This model is a direct dimensional replacement only for another AirTAC SCJ80 cylinder with the same 189 mm nominal stroke and 20 mm adjustment range.
Adjustable-stroke checklist
At 0.5 MPa air pressure, this cylinder produces 2513 N of pushing force and 2268 N of pulling force. At the maximum operating pressure of 0.9 MPa, the push force increases to 4523 N.
Yes, the SCJ80X189-20 has the same mounting footprint and port size as the SC80X189, but it adds a rear adjusting screw. Ensure you have clearance for the longer overall body length and that your application benefits from the adjustable stroke feature.
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