The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X250-20S 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, 250mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X250-20S is a tie-rod, double-acting, single-rod cylinder with a 20 mm rear adjusting screw, letting you fine-tune the stroke end position in the field without swapping the unit. With an 80 mm bore, it delivers 2513 N of push force at 0.5 MPa, making it a strong choice for mid-range pneumatic tasks that need precise end-stop calibration.
This model includes a built-in magnet (suffix -S), so CMSG/DMSG/EMSG sensors clamp directly onto the barrel for reliable position feedback. The 25 mm piston rod and PT3/8 ports handle high flow, while the 28 mm air cushion decelerates the load smoothly. Its body length A(SCJ) is 239 mm, slightly longer than a fixed-stroke SC of the same bore.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X250-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 250 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. |
| ×250 | 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.
The 20 mm adjustment screw lets technicians dial in the exact stroke end during machine commissioning, eliminating the need for shims or custom hard stops.
On packaging lines, quickly adjust the cylinder stroke to accommodate different box or product sizes without mechanical rework, reducing downtime between batches.
In clamping or pressing fixtures, the adjustable stroke can take up slack from pad wear over time, maintaining consistent clamping force without replacing the cylinder.
Step up to the 100 mm bore (3927 N push at 0.5 MPa) if your load exceeds 2500 N, or down to the 63 mm bore (1559 N push) for a lighter, more compact solution. The SCJ is the right pick when you need to dial in the stroke end during commissioning or changeover; if your stroke is fixed and never needs adjustment, the standard SC cylinder is a simpler, lower-cost alternative. For a direct replacement, match an AirTAC SCJ with an 80 mm bore, 250 mm nominal stroke, 20 mm adjust range, PT ports, basic mounting, and a built-in magnet. At a 250 mm stroke, ensure the rod is guided externally if significant side loads are present.
Adjustable-stroke checklist
At 0.5 MPa, it generates 2513 N of push force and 2268 N of pull force. The maximum push force at the 0.9 MPa operating limit is 4523 N. The pull force is lower because the rod reduces the piston area on the return side.
Yes, if you need the adjustable stroke feature. The SCJ80X250-20S matches the mounting footprint of an SC80 but has a longer body to house the adjusting screw. Ensure your replacement matches the 80 mm bore, 250 mm nominal stroke, PT ports, and that you have space for the A(SCJ) body length of 239 mm.
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