The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X125-100 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø80mm bore, 125mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X125-100 is a double-acting, single-rod pneumatic cylinder engineered for applications demanding on-the-fly stroke end-position tuning. Its rear-cap adjusting screw provides a full 100 mm of adjustment range, letting you fine-tune the 125 mm nominal stroke to exactly 25 mm without swapping the unit. With a 25 mm piston rod and a push force of 2513 N at 0.5 MPa (4523 N at 0.9 MPa), it handles substantial mid-range automation loads.
This 80 mm bore tie-rod cylinder uses PT3/8 ports and an M20x1.5 rod thread, with a 28 mm air cushion to decelerate the piston smoothly. The body length A is 239 mm, making it a compact but powerful choice for format changeovers, commissioning trials, and wear take-up in packaging or assembly machinery where a fixed-stroke cylinder would require mechanical rework.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X125-100 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 100 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. |
| -100 | 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 pusher stroke end in seconds when switching between box sizes on a case packer, eliminating mechanical stop changes and reducing downtime.
Dial in the exact clamping position for different workpiece thicknesses in a welding or assembly jig, using the 100 mm screw range to accommodate part variations.
Fine-tune actuator end-positions during machine commissioning without ordering multiple fixed-stroke cylinders, accelerating the build-and-test cycle.
Step up to the 100 mm bore SCJ100 series if you need more force—it delivers 3927 N push at 0.5 MPa. For lighter, faster tasks, the 63 mm bore SCJ63 provides 1559 N and a smaller footprint. This adjustable-stroke model is the right pick when the machine's end-stop must be dialed in during setup or changed between product runs; if the stroke is permanently fixed, a standard SC80 fixed-stroke cylinder is a simpler, lower-cost alternative. The exact replacement match is an AirTAC SCJ80X125-100 with PT3/8 ports, basic mounting, and no magnet. For strokes of 125 mm, side-loading is moderate, but always guide the load externally if the rod is subjected to off-axis forces.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 2513 N and the pull force is 2268 N (the pull force is lower because the 25 mm rod reduces the effective piston area on the return stroke). At the maximum operating pressure of 0.9 MPa, the push force reaches 4523 N.
Yes, if you need field-adjustable stroke. The SCJ80X125-100 has a longer body (A=239 mm) than the fixed-stroke SC to house the adjusting screw, but shares the same mounting accessories (FA, LB, TC) and porting. Ensure the 100 mm adjustment range covers your minimum stroke requirement.
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