The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X500-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø80mm bore, 500mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X500-40 is an 80 mm bore, double-acting single-rod pneumatic cylinder with a field-adjustable stroke end. A rear-cap adjusting screw lets you shorten the stroke by up to 40 mm, giving a working range of 460–500 mm without swapping the cylinder. At 0.5 MPa it delivers 2513 N push and 2268 N pull, and at the maximum operating pressure of 0.9 MPa push force reaches 4523 N — a robust force class for pressing, clamping and heavy transfer tasks.
This tie-rod cylinder uses a 25 mm diameter piston rod with an M20x1.5 male knuckle thread and PT3/8 ports. The body length A for the SCJ80 series is 239 mm, and the adjustable air cushion is 28 mm long to decelerate the piston smoothly at both ends. The 500 mm nominal stroke is well within the 1500 mm maximum standard stroke for this bore, so the unit is a standard stocked configuration.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X500-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 500 mm |
| Stroke adjustment | Up to 40 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. |
| ×500 | Nominal (maximum) stroke length in mm. |
| -40 | 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 setup, the 40 mm adjusting screw lets technicians dial in the exact stroke end for a pusher or stop without fabricating mechanical shims. Changes take seconds with a wrench, speeding up line commissioning.
When a packaging machine switches between box sizes, the SCJ80X500-40 adjusts the stroke end to match the new product width. Operators reset the stop position in under a minute, minimizing downtime between batches.
In a weld fixture or assembly jig, the adjustable stroke compensates for wear on clamp pads or tooling over thousands of cycles. The 40 mm range lets maintenance teams restore clamping force without replacing the cylinder.
Choose the SCJ80X500-40 when you need to dial in the stroke end position during commissioning or after a format change — the 40 mm adjustment range eliminates the need for external hard stops. If your application needs more force, the 100 mm bore SCJ100 series provides 3927 N push at 0.5 MPa; for a lighter, more compact solution the 63 mm bore SCJ63 delivers 1559 N push. Should your motion require a fixed, repeatable stroke with no field adjustment, the standard SC80X500 fixed-stroke cylinder is a simpler alternative.
For this 500 mm stroke, consider side-load and rod buckling. If the load is not guided externally, add a guide unit or switch to a guided cylinder to protect the rod and bearing. The exact replacement match is an AirTAC SCJ80X500-40 with PT3/8 ports and basic mounting. If you later add a magnet for sensors, the code becomes SCJ80X500-40S.
Adjustable-stroke checklist
At 0.5 MPa air pressure it generates 2513 N pushing force and 2268 N pulling force. At the maximum operating pressure of 0.9 MPa, push force rises to 4523 N. Because it is a single-rod cylinder, push force is always greater than pull force due to the rod area on the return side.
Yes, provided you have space for the slightly longer rear adjusting screw housing. The SCJ80X500-40 shares the same bore, rod, port and mounting dimensions as the SC80 series. The key difference is the rear screw that shortens the stroke end by up to 40 mm. Ensure your machine clearance allows for the extended body length A of 239 mm.
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