The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X250-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø80mm bore, 250mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X250-40S is a double-acting, single-rod pneumatic cylinder from AirTAC that puts stroke-end fine-tuning directly into the rear cap. Its 40 mm adjusting screw lets you dial in the exact stop position on the machine without swapping the cylinder or adding external hard stops, making it a practical choice for commissioning and format changeovers. The built-in magnet (-S) allows CMSG, DMSG, or EMSG sensors to clamp onto the tie-rod barrel for reliable end-of-stroke detection.
With an 80 mm bore and 25 mm piston rod, this unit delivers 2513 N of push force at 0.5 MPa and up to 4523 N at the maximum operating pressure of 0.9 MPa. The pull force at 0.5 MPa is 2268 N, reflecting the single-rod area difference. The body length A(SCJ) is 239 mm, and the adjustable air cushion decelerates the piston smoothly over a 28 mm cushion length. The standard PT1/8 port and M20x1.5 rod thread make it a direct fit into common pneumatic circuits.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X250-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 40 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. |
| -40 | 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.
During machine setup, the 40 mm rear adjusting screw allows engineers to precisely dial in the stroke end position without dismounting the cylinder, saving hours of mechanical rework.
On packaging or assembly lines that run multiple product sizes, the adjustable stroke lets operators quickly reset the pusher or stop position between batches.
In clamping or pressing fixtures, the screw can be advanced slightly over time to compensate for tooling or pad wear, maintaining consistent clamp force without replacing the actuator.
Step up to the SCJ100 bore if your application demands more than the SCJ80's 2513 N push at 0.5 MPa; the 100 mm bore delivers 3927 N at the same pressure. If your stroke is fixed and never needs field adjustment, the standard SC80 fixed-stroke cylinder is a simpler, lower-cost alternative. For a drop-in replacement, match the SCJ80 bore, the 250 mm nominal stroke, the -40 adjustable range, the PT port thread, and the -S magnet option.
At a 250 mm nominal stroke, the rod is well supported inside the bearing, but if the load applies significant side force, consider adding an external linear guide or switching to a guided cylinder to protect the rod bearing and seal from premature wear.
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. These values assume standard air supply and no significant back-pressure on the exhaust side.
Yes, provided the bore (80 mm), port thread (PT1/8), and mounting style match. The SCJ80X250-40S has the same body length A(SCJ) of 239 mm as the fixed-stroke SC series, but the rear adjusting screw adds a small amount of overall length. Ensure you have clearance for the screw and the sensor if using the built-in magnet.
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