The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X25-20 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, 25mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The AirTAC SCJ80X25-20 is a double-acting, single-rod pneumatic cylinder delivering 2513 N of push force at 0.5 MPa, with a pull force of 2268 N due to the 25 mm piston rod. Its defining feature is the rear-cap adjusting screw, which provides up to 20 mm of field-adjustable stroke-end reduction, allowing precise fine-tuning of the piston's stop position without replacing the cylinder.
With a 28 mm air cushion for smooth deceleration and a body length of 239 mm, this tie-rod cylinder is built for reliable industrial service. The PT3/8 port and M20x1.5 rod thread ensure straightforward pneumatic connections, making it a versatile choice for applications requiring on-the-fly stroke adjustment.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X25-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 25 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. |
| ×25 | 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.
Perfect for setting precise end stops on new automated assembly fixtures, where the 20 mm adjustment range allows engineers to dial in the exact position during initial setup and testing.
In high-cycle clamping or pressing operations, the adjustable stroke can be periodically tweaked to compensate for pad or tooling wear, maintaining consistent clamping force without replacing the cylinder.
Ideal for packaging lines where a diverter gate's throw needs a slight adjustment between product runs. The 20 mm range handles minor format differences quickly on the factory floor.
Choose the SCJ80X25-20 when you need to dial in a short, precise stroke end position during commissioning or changeovers. If you require a higher force output, stepping up to the 100 mm bore provides 3927 N of push force at the same 0.5 MPa pressure. For applications where the stroke is fixed and never needs adjustment, the standard SC series offers a more economical solution without the rear screw mechanism.
For a direct replacement, match an SCJ cylinder with an 80 mm bore, a 25 mm nominal stroke, and a 20 mm adjustment range, ensuring the PT port thread and basic mounting style are identical. If this model is used in a vertical or side-loaded orientation, an external guide rail is recommended to protect the rod from bending moments.
Adjustable-stroke checklist
At 0.5 MPa (5 bar), the push force is 2513 N and the pull force is 2268 N. The difference is due to the 25 mm rod reducing the effective piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the push force reaches 4523 N.
A screw in the rear cap allows you to shorten the stroke end by up to 20 mm. This sets a new, earlier stopping position for the piston without affecting the 25 mm nominal rating. It is a mechanical stroke limiter, not a speed or force control.
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