The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X275-30 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø80mm bore, 275mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X275-30 is an 80 mm bore double-acting cylinder featuring a rear-cap adjusting screw that provides 30 mm of field-adjustable stroke-end travel. With a 25 mm piston rod and PT3/8 ports, it delivers 2513 N of push force at 0.5 MPa, scaling up to 4523 N at the maximum operating pressure of 0.9 MPa. The 28 mm air cushion decelerates the piston smoothly, and the unit's body length A(SCJ) is 239 mm.
This adjustable-stroke design allows machine builders and maintenance teams to fine-tune the end position during commissioning, format changeovers, or to compensate for tooling wear without removing the cylinder. It is a genuine AirTAC pneumatic component built for reliable, repeatable motion control in industrial automation where stroke precision needs to be dialled in on the machine.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X275-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 275 mm |
| Stroke adjustment | Up to 30 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. |
| ×275 | Nominal (maximum) stroke length in mm. |
| -30 | 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 30 mm adjustment screw lets technicians dial in the exact end-of-stroke position during initial machine setup, eliminating the need for shims or external hard stops when aligning an 80 mm bore actuator.
On packaging or assembly lines running multiple product sizes, the SCJ80X275-30 allows operators to quickly adjust the stroke end to suit a new format without replacing the cylinder or re-machining mounting brackets.
In high-cycle clamping or pressing operations, the adjustable stroke can be periodically tweaked to compensate for gripper pad or tooling wear, maintaining consistent contact force and part quality over the cylinder's service life.
Choose the SCJ80 bore when your application needs roughly 2500 N of push force at standard plant air pressure. If you require more force, stepping up to the 100 mm bore provides 3927 N at 0.5 MPa. For applications needing less force, the 63 mm bore offers 1559 N. If your stroke length is fixed and will never need adjustment, the standard SC fixed-stroke cylinder is a simpler, more cost-effective alternative. For a direct replacement, match an SCJ cylinder with an 80 mm bore, 275 mm nominal stroke, 30 mm adjustable range, PT3/8 ports, and basic mounting. At this 275 mm stroke, ensure the rod is guided externally or consider a guided cylinder if the load applies significant side force to prevent rod bending and seal wear.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 2513 N and the pull force is 2268 N. The push force is higher because the single piston rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 513 kgf.
Yes, provided the mounting and porting match. The SCJ shares the same bore, rod diameter, and port size as the SC80. However, the SCJ body is slightly longer to accommodate the rear adjusting mechanism. Ensure you have the additional clearance and that a 30 mm adjustable stroke range is suitable for your process.
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