The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X500-20S 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, 500mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X500-20S is an 80 mm bore, double-acting, single-rod pneumatic cylinder with a 500 mm nominal stroke and a rear-cap adjusting screw offering a 20 mm field-adjustable range. Operating on filtered air at 0.15-1.0 MPa, it delivers a push force of 2513 N and a pull force of 2268 N at 0.5 MPa, making it a strong mid-range actuator for tasks where the stroke end position needs fine-tuning during commissioning or format changes.
This model includes a built-in magnet (suffix -S), allowing easy clamping of CMSG/DMSG/EMSG reed or solid-state sensors directly onto the tie-rod barrel for end-of-stroke or mid-stroke position feedback. The 25 mm diameter rod and PT3/8 port provide robust mechanical connection and flow, while the 28 mm air cushion at each end decelerates the piston smoothly, protecting the end caps during high-cycle operation.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X500-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 500 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. |
| ×500 | 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 stroke-end adjustment screw allows engineers to precisely dial in the final stop position on a new machine without remachining brackets or swapping cylinders, saving hours of setup time during factory acceptance tests.
On a packaging line, a pusher arm driven by this cylinder can have its retract or extend end-point tweaked over time to compensate for wear on a mechanical stop pad, maintaining consistent product placement without immediate parts replacement.
In a palletizing cell handling different box sizes, the 20 mm adjustment range lets operators quickly change the push stroke end position for a new product format, eliminating the need for multiple fixed-stroke cylinders or complex programmable stops.
Step up to the SCJ100X500-20S if your application requires a higher force class; the 100 mm bore provides 3927 N of push force at 0.5 MPa, a significant 56% increase over the 2513 N from this 80 mm bore. For lighter, more compact needs, the SCJ63X500-20S offers 1559 N of push force. If a fixed stroke is acceptable and you do not need field adjustability, the standard SC80X500 is a simpler, cost-effective alternative. For a direct replacement, match an SCJ80 cylinder with a 500 mm nominal stroke, a -20 adjust range, PT3/8 ports, and a built-in magnet.
With a 500 mm stroke, side-loading and rod buckling are important considerations. Ensure the load is guided externally and the cylinder rod is aligned concentrically with the load path. For applications with inherent side forces, consider adding an external guide rail or switching to a guided cylinder assembly to prevent premature seal wear and rod bending.
Adjustable-stroke checklist
A screw mechanism in the rear end cap acts as an internal, adjustable stop for the piston. Turning the screw shortens the stroke end position by up to 20 mm from the nominal 500 mm maximum. This only adjusts the stroke length, not the cylinder's output force.
At the standard operating pressure of 0.5 MPa, the SCJ80 cylinder generates 2513 N of push force and 2268 N of pull force. The maximum push force at 0.9 MPa is 4523 N. Pull force is lower due to the area of the 25 mm piston rod.
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