The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X250-20 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 SCJ80X250-20 is an 80 mm bore double-acting single-rod cylinder with a 250 mm nominal stroke and a rear-cap adjusting screw that provides up to 20 mm of stroke-end reduction. This allows the effective stroke to be field-tuned between 230 and 250 mm without swapping the cylinder, making it ideal for commissioning trials and format changeovers. At 0.5 MPa, it delivers 2513 N of push force and 2268 N of pull force, with a 25 mm diameter piston rod and PT3/8 ports.
The cylinder body length A(SCJ) is 239 mm, and it includes an adjustable air cushion for smooth deceleration. The operating pressure range is 0.15–1.0 MPa, with a speed range of 30–800 mm/s. This model comes in a basic mounting configuration with TPU seals and standard PT threads, ready for direct integration into pneumatic systems requiring a robust, adjustable end-stop.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X250-20 |
|---|---|
| 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.
Fine-tune the end-stop position during machine commissioning without removing the cylinder. The 20 mm adjustment range lets technicians quickly dial in the exact stroke needed for new tooling or product formats.
In high-cycle sorting gates or diverters, the adjustable screw can be periodically advanced to compensate for mechanical wear on contact surfaces, maintaining precise positioning over the cylinder's service life.
On packaging or assembly lines running multiple product sizes, operators can quickly adjust the stroke end to accommodate different box heights or part dimensions, minimizing downtime between batches.
Select the SCJ80X250-20 when you need to precisely dial in the stroke end position on an 80 mm bore platform. If your force requirement is lower, stepping down to the 63 mm bore (1559 N push at 0.5 MPa) can reduce actuator size and air consumption. For applications needing a fixed, non-adjustable stroke, the standard SC80X250 cylinder is a simpler, more cost-effective alternative. A direct replacement must match the 80 mm bore, 250 mm nominal stroke, 20 mm adjust range, PT3/8 ports, and basic mounting.
For this 250 mm stroke length, be mindful of side loads on the 25 mm rod. If the load is not guided externally, consider adding an external guide rail or switching to a guided cylinder to prevent rod bending and premature seal wear, especially at higher speeds.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, it generates 2513 N of push force and 2268 N of pull force. The maximum push force at 0.9 MPa is 4523 N. The pull force is lower due to the area of the 25 mm piston rod.
Yes, the SCJ80X250-20 is a direct dimensional replacement for an SC80X250, provided the extra body length for the adjusting screw is accommodated. It uses the same mounting accessories (FA, LB, TC) and port sizes (PT3/8). The adjustable stroke adds the ability to fine-tune the end position.
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