The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X450-75 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, 450mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X450-75 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that lets you fine-tune the stroke end position by up to 75 mm without dismounting the unit. At 0.5 MPa, it delivers 2513 N of push force and 2268 N on the pull stroke, making it a strong mid-bore workhorse for applications where the end-stop must be dialled in precisely during commissioning or format changes.
This 80 mm bore cylinder uses a 25 mm diameter piston rod and PT3/8 ports, with a body length A of 239 mm plus the 450 mm nominal stroke. It features an adjustable air cushion (28 mm long) for smooth deceleration and operates reliably from 0.15 to 1.0 MPa. The standard TPU seal suits ambient temperatures from -20 to +70 °C.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X450-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 450 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. |
| ×450 | 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.
The 75 mm adjustment range lets integrators dial in the exact stop position for a 450 mm stroke on a new packaging machine without swapping cylinders or machining hard stops.
Quickly adapt the stroke end for different box sizes on a case packer. The rear screw adjusts the push stroke from 375 to 450 mm, accommodating multiple formats with one cylinder.
In a long-stroke clamping station, the adjustable end position compensates for pad wear or workpiece variation over time, maintaining consistent clamp force without reprogramming a servo axis.
Choose the SCJ80X450-75 when you need to commission a 450 mm stroke with on-machine adjustability. If the 2513 N push at 0.5 MPa is more than you need, stepping down to a 63 mm bore (1559 N push) saves space and air consumption; if you need more force, the 100 mm bore delivers 3927 N push. For a fixed, non-adjustable stroke, the standard SC80X450 is a direct alternative.
At 450 mm of stroke, side-loading and rod buckling are real risks. If your load is not guided externally, add a guide rail or switch to a guided cylinder to protect the rod and bearing. When replacing an existing SCJ, match the bore, 450 mm nominal stroke, -75 adjust range, PT3/8 port, and basic mounting configuration.
Adjustable-stroke checklist
At 0.7 MPa operating pressure, the push force is 3518 N and the pull force is 3175 N. Because this is a single-rod cylinder, the push force is always higher than the pull force due to the rod area on the piston.
Yes, provided you have clearance for the slightly longer rear cap that houses the adjusting screw. The SCJ has the same bore, port (PT3/8), and rod (25 mm) as the fixed-stroke SC80, but adds the ability to shorten the stroke end by up to 75 mm. Mounting accessories from the SCJ subset (FA, LB, TC) are required.
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