The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X250-75S 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, 250mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X250-75S is an 80 mm bore double-acting, single-rod cylinder with a 75 mm rear stroke-end adjustment range, letting you fine-tune the 250 mm nominal stroke on the machine without swapping the cylinder. At 0.5 MPa it delivers 2513 N push and 2268 N pull, and the 25 mm rod with PT3/8 ports handles mid-range clamping, pressing, and positioning tasks where setup flexibility is key.
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 reliable end-of-stroke detection. The adjustable cushion decelerates the piston smoothly, and the body length A is 239 mm—a compact envelope for its force class.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X250-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 250 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. |
| ×250 | 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 stroke-end screw lets operators quickly dial in different clamp depths for varying product heights on a shared assembly line, avoiding mechanical stop changes.
Fine-tune the stopping position of a 2513 N push cylinder to handle different box sizes or pallet patterns without reprogramming the controller—just turn the rear screw.
Compensate for tooling wear or material thickness drift over a production run by advancing the stroke end with the 75 mm adjuster, maintaining consistent press force.
Choose this 80 mm bore when the 63 mm bore’s 1559 N push at 0.5 MPa is too light; if you need more force, the 100 mm bore offers 3927 N push. The 75 mm adjustment range is ideal for format changeovers where the stroke end must shift significantly. For a fixed stroke without the rear screw, pick the standard SC series; if the rod must extend from both ends, use an SCD double-rod cylinder.
For replacement, match an AirTAC SCJ80X250-75S with the same bore, 250 mm nominal stroke, 75 mm adjust range, PT ports, and built-in magnet. At 250 mm stroke, the rod is well supported, but if the load applies a side force, add an external guide rail or switch to a guided cylinder to prevent rod bending.
Adjustable-stroke checklist
At 0.5 MPa air pressure, the push force is 2513 N and the pull force is 2268 N (pull is lower because the 25 mm rod reduces the piston area on the return side). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 5026 N.
The rear-cap adjusting screw shortens the stroke end by up to 75 mm from the 250 mm nominal maximum; it does not change the cylinder’s force or speed. You can replace it with a fixed-stroke SC80X250, but you will lose the field-adjustment feature. Ensure the replacement matches the PT ports, basic mount, and magnetic piston (-S) if sensor detection is needed.
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