The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X170-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø80mm bore, 170mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X170-75 is an 80 mm bore double-acting single-rod pneumatic cylinder with a rear adjusting screw that lets you shorten the stroke end by up to 75 mm without removing the cylinder from the machine. Its 25 mm diameter piston rod and PT3/8 ports deliver a push force of 2513 N at 0.5 MPa, rising to 4523 N at the maximum operating pressure of 0.9 MPa, making it a robust actuator for mid-range industrial tasks where the final stop position must be dialled in precisely during commissioning or changeover.
This tie-rod cylinder uses a 28 mm air cushion to decelerate the piston quietly at end of travel. The body length A is 239 mm, slightly longer than a fixed-stroke SC of the same bore. The adjustable screw acts only on the stroke end position; it does not alter the cylinder's force output or speed capability, which remains 30-800 mm/s across the standard operating pressure range of 0.15-1.0 MPa.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X170-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 170 mm |
| Stroke adjustment | Up to 75 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. |
| ×170 | Nominal (maximum) stroke length in mm. |
| -75 | 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.
On packaging or filling lines, the 75 mm adjustment range lets operators quickly reset the cylinder's end position for different box heights or container sizes without swapping mechanical stops or reprogramming servo axes.
During machine build and debug, the rear screw allows engineers to incrementally dial in the exact stroke end for a press, clamp, or ejector function, compensating for stack-up tolerances in the tooling.
In high-cycle gripping or pressing operations where tooling faces gradually wear, the adjustable stroke end can be advanced periodically to maintain consistent contact pressure and part quality without replacing the cylinder.
Step up to the SCJ100 bore if you need more force—the 100 mm version provides 3927 N push at 0.5 MPa. For applications that do not require field stroke adjustment, the fixed-stroke SC80 cylinder is a simpler, lower-cost alternative. If your load applies a significant side force or the 170 mm stroke creates a risk of rod buckling, pair the cylinder with an external guide rail or switch to a guided cylinder.
As a direct replacement, match an AirTAC SCJ adjustable-stroke cylinder of 80 mm bore, 170 mm nominal stroke, 75 mm adjust range, PT port thread, and basic mounting. The SCJ mounting system accepts FA front flange, LB foot, or TC centre trunnion accessories (no FB or clevis mounts).
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 2513 N and the pull force is 2268 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 4523 N. Because this is a single-rod cylinder, the push force is greater than the pull force due to the rod area on the return side.
No. The SCJ80X170-75 does not have a locking or holding feature. The air cushion only decelerates the piston near the stroke end, and the adjusting screw only sets the end position. If the load must be held without live air pressure, you will need an external rod brake, a mechanical lock, or a pilot-operated check valve.
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