The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X125-75STC 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 SCJ80X125-75STC is an 80 mm bore double-acting single-rod cylinder with a 75 mm rear adjustable stroke range, allowing the end position to be fine-tuned from 50 mm up to the full 125 mm nominal stroke without swapping the unit. It delivers 2513 N of push force at 0.5 MPa and 4523 N at 0.9 MPa, using a 25 mm piston rod and PT3/8 ports.
This model includes a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors and a centre trunnion (TC) pivot for swinging loads, supplied with the TCM1 bracket. The 28 mm air cushion decelerates the piston smoothly, and the tie-rod body length A(SCJ) is 239 mm, making it a compact solution for format-changeover stations.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X125-75STC |
|---|---|
| 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.
The 75 mm adjustment screw lets operators quickly reset the stroke end for different product sizes on a packaging line without mechanical stops, reducing downtime between batches.
During press-fit or clamping operations, the stroke can be micro-adjusted to compensate for tooling wear or part tolerance stack-up, maintaining consistent assembly force.
The centre trunnion mount allows the cylinder to pivot freely as it extends and retracts a diverter gate, while the adjustable stroke sets the precise gate angle for smooth product transfer.
Choose this 80 mm bore when the 63 mm bore's 1559 N push at 0.5 MPa is marginal; if you need more force, the 100 mm bore provides 3927 N. The SCJ adjustable-stroke design is ideal for commissioning trials where the exact stroke must be dialled in on the machine, unlike a fixed-stroke SC cylinder. For a direct replacement, match an SCJ80 with a 125 mm nominal stroke, 75 mm adjust range, PT ports, TC mount, and magnet.
At 125 mm stroke, rod bending is not a primary concern, but if the load applies a significant side force, consider adding an external guide rail or switching to 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, the push force reaches 4523 N. The pull force is lower because the 25 mm piston rod reduces the effective area on the return stroke.
Yes, if you need field-adjustable stroke. The SCJ80X125-75STC matches the SC80 bore and port size, but adds a rear adjusting screw for a 50-125 mm variable stroke. Ensure your mounting accommodates the slightly longer body length (239 mm A dimension) and that you match the PT port thread and TC trunnion mount.
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