The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X125-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø80mm bore, 125mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X125-75 is an 80 mm bore double-acting single-rod cylinder with a field-adjustable stroke end, letting you dial in the exact stopping position within a 75 mm range without swapping the unit or adding external hard stops. It delivers 2513 N of push force at 0.5 MPa and up to 4523 N at 0.9 MPa, making it a solid mid-range actuator for pressing, clamping, and format-change tasks.
This tie-rod cylinder uses a 25 mm diameter piston rod and PT3/8 ports, with an adjustable air cushion that decelerates the piston over the final 28 mm of travel. The SCJ body length A is 239 mm, slightly longer than a fixed-stroke SC of the same bore to accommodate the rear adjusting screw. It is a genuine AirTAC component built for reliable, repeatable stroke-end tuning on the factory floor.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X125-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 75 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. |
| ×125 | Nominal (maximum) stroke length in mm. |
| -75 | 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.
Adjust the stroke end by up to 75 mm to accommodate different workpiece thicknesses on a clamping station without changing the cylinder or fixtures.
Compensate for gradual wear on a conveyor stop pad by dialing the rear screw to restore the precise stopping position, extending service intervals.
Fine-tune the insertion depth of a press-fit operation during pilot runs and then lock the setting for production, using the 75 mm adjustment range.
Step up to the SCJ100 for 3927 N of push at 0.5 MPa if your load exceeds the SCJ80's 2513 N capability, or drop to the SCJ63 (1559 N push) when a smaller, lighter actuator suits the space. Choose this SCJ over a fixed-stroke SC when you need to fine-tune the stroke end during commissioning, after tooling wear, or for multiple product setups on one machine. For a direct replacement, match the 80 mm bore, 125 mm nominal stroke, 75 mm adjust range, PT3/8 ports, basic mounting, and no magnet. If the rod sees side load at this 125 mm stroke, add an external guide rail or consider a guided cylinder to protect the rod bearing and seal.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 2513 N and the pull force is 2268 N. At the maximum operating pressure of 0.9 MPa, push force reaches 4523 N. Because it is a single-rod cylinder, push force is always greater than pull force.
Yes, if you need the 75 mm stroke-end adjustability. The SCJ80X125-75 has the same bore, nominal stroke, port size, and mounting footprint as the SC series, but the body is slightly longer to house the adjusting screw. Ensure the extra length fits your machine.
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