The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X70-30 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, 70mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X70-30 is an 80 mm bore double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. Its rear-cap adjusting screw provides up to 30 mm of stroke shortening, allowing machine builders to fine-tune the end position without swapping the cylinder or adding external hard stops. At 0.5 MPa, it delivers 2513 N of push force and 2268 N on the pull stroke, driven by a 25 mm diameter piston rod.
This adjustable-stroke design is ideal for commissioning trials, format changeovers, and applications where the exact stroke length must be dialled in on the machine. The cylinder body length A(SCJ) is 239 mm, and it features a 28 mm air cushion to decelerate the piston quietly at the end of travel. Standard PT3/8 ports and an M20x1.5 rod thread make it a direct fit for common pneumatic circuits.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X70-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 70 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. |
| ×70 | 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 rear screw adjustment lets technicians dial in the exact stroke end position during machine setup, eliminating the need for shims or custom hard stops.
On packaging or assembly lines, operators can quickly adjust the cylinder stroke to accommodate different product sizes without mechanical modifications.
Over time, as tooling or grippers wear, the adjustable stroke can be extended slightly to maintain precise contact and consistent cycle quality.
Choose the SCJ80X70-30 when you need the 80 mm bore's 2513 N push force at 0.5 MPa and the ability to adjust the stroke end by up to 30 mm in the field. If your force requirement is lower, stepping down to a 63 mm bore reduces push force to 1559 N at the same pressure. For a fixed, non-adjustable stroke, the standard SC80 series offers a simpler, slightly more compact body. This cylinder is a direct replacement for another AirTAC SCJ80 with a 70 mm nominal stroke, 30 mm adjust range, PT ports, and basic mounting.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder generates 2513 N of push force and 2268 N of pull force. The maximum operating pressure is 1.0 MPa, producing 4523 N of push force.
Yes, if you need the ability to shorten the stroke by up to 30 mm. The SCJ80 shares the same mounting footprint and port size as the SC80, but the body is slightly longer to accommodate the rear adjusting screw mechanism.
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