The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X50-30 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, 50mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X50-30 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, built around an 80 mm bore and a 25 mm diameter piston rod. Its rear-cap adjusting screw provides up to 30 mm of stroke-end reduction, allowing you to dial in the exact stopping position without swapping the cylinder or adding external hard stops. At 0.5 MPa, it delivers 2513 N of push force and 2268 N of pull force, placing it in a force class suited for medium-to-heavy clamping, pressing, and positioning tasks.
This tie-rod cylinder uses PT3/8 ports and an M20x1.5 rod thread, with a 28 mm air cushion at each end to decelerate the piston quietly. The SCJ body length (A dimension) is 239 mm, slightly longer than a fixed-stroke SC of the same bore to accommodate the adjusting mechanism. It operates on filtered air from 0.15 to 1.0 MPa and is rated for speeds of 30-800 mm/s, making it a versatile workhorse for general automation.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X50-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 50 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. |
| ×50 | 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.
During machine bring-up, the 30 mm adjustable stroke lets technicians tweak the end position in seconds with a wrench, eliminating the need to machine custom spacer blocks or swap cylinders to hit the exact stop point.
On packaging or assembly lines that run multiple product sizes, operators can quickly adjust the cylinder stroke to match a new box height or component thickness, reducing changeover downtime from minutes to seconds.
In high-cycle pressing or clamping fixtures, the stroke-end screw can be advanced over time to take up mechanical wear on tooling contact surfaces, maintaining consistent clamp force without replacing the cylinder.
Choose the SCJ80X50-30 when you need to fine-tune the stroke end position during commissioning or after tooling wear, and the 80 mm bore's 2513 N push force at 0.5 MPa matches your load. If you require more force, stepping up to a 100 mm bore provides 3927 N of push; if you need less force and a smaller footprint, the 63 mm bore delivers 1559 N. For applications where the stroke never needs field adjustment, a fixed-stroke SC80X50 cylinder is a simpler, slightly shorter alternative. This SCJ is a direct replacement for another AirTAC SCJ80X50-30 with PT ports and basic mounting; if your original unit had a magnet or a different mounting style, match those suffix codes exactly.
Adjustable-stroke checklist
Because it is a single-rod cylinder, push and pull forces differ. At 0.5 MPa, push force is 2513 N and pull force is 2268 N. At the maximum operating pressure of 0.9 MPa, push force reaches 4523 N. The rear adjusting screw changes only the stroke end position, not the force output.
Yes, if the bore (80 mm), nominal stroke (50 mm), and adjustable range (30 mm) match. You must also confirm the port thread (PT), mounting style (basic), and whether a magnet (-S) is required for your sensors. The SCJ is a tie-rod design, so it is dimensionally interchangeable only with another AirTAC SCJ of the same specifications.
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