The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X250-40 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, 250mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X250-40 is an 80 mm bore, double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. A rear-cap adjusting screw provides up to 40 mm of stroke-length reduction, letting you fine-tune the piston stop position during commissioning or changeovers without removing the cylinder. At 0.5 MPa, it delivers 2513 N of push force and 2268 N on the pull stroke, with a 25 mm piston rod and PT3/8 ports.
This tie-rod cylinder uses an adjustable air cushion to decelerate the 250 mm nominal stroke, and the SCJ body length (A dimension) is 239 mm. The operating range spans 0.15–1.0 MPa, with a proof pressure of 1.5 MPa, making it suitable for general industrial automation tasks where the end position needs regular tweaking.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X250-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 250 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. |
| ×250 | 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.
Dial in the exact 250 mm stroke end-stop on a new assembly line using the 40 mm adjustment screw, eliminating the need to shim or reposition the cylinder mounts during initial runoff.
Quickly adapt a packaging machine's pusher stroke for different box sizes. The operator adjusts the rear screw to shorten the 250 mm stroke by up to 40 mm, accommodating a new product format in minutes.
On a clamping or pressing fixture, use the adjustable stroke to take up mechanical wear in tooling or seals over time, restoring the precise 2513 N clamp position without replacing the actuator.
Choose the SCJ80 when your application needs around 2500 N of push force at standard shop air. If you require more power, the SCJ100 bore steps up to 3927 N push at 0.5 MPa; for a lighter, more compact solution, the SCJ63 provides 1559 N. This adjustable-stroke model is ideal where the stroke length must be dialed in on the machine—if your stroke is fixed and never changes, the standard SC80X250 is a simpler, cost-effective alternative. For strokes of 300 mm or longer, consider an external guide rail or a guided cylinder to protect the 25 mm rod from side-load bending.
As a direct replacement, match an AirTAC SCJ80 with a 250 mm nominal stroke, 40 mm adjust range, PT3/8 ports, and the same basic mounting configuration. The SCJ mounting system supports FA front flange, LB foot, or TC centre trunnion (with TCM1 bracket), but does not offer FB or CA/CB clevis mounts.
Adjustable-stroke checklist
The output force depends only on the 80 mm bore and air pressure, not the stroke adjustment. 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 screw only changes the stroke end position, not the cylinder's force.
Yes, if you need the 40 mm field-adjustability. The SCJ80X250-40 has the same 80 mm bore, 250 mm maximum stroke, PT3/8 ports, and mounting footprint as the SC series. Ensure your mounting style (basic, FA, LB, or TC) and any magnet sensor option match when ordering a replacement.
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