The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X250-30 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø80mm bore, 250mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X250-30 is an 80 mm bore double-acting single-rod cylinder whose rear-cap adjusting screw lets you shorten the stroke end by up to 30 mm without removing the cylinder. At 0.5 MPa it delivers 2513 N push and 2268 N pull, placing it in the 2.5 kN class for medium-heavy linear tasks.
Its 25 mm diameter rod, PT3/8 ports, and 28 mm air cushion suit applications needing a robust push force with a field-tuneable end position. The tie-rod body is 239 mm long (A dimension) and the standard 250 mm nominal stroke is well within the bore's 1500 mm maximum, so no special order is required.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X250-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 30 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. |
| -30 | 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 30 mm rear screw allows engineers to precisely dial in the stroke end position for a gripper or pusher, compensating for stack-up tolerances without re-machining stops.
On a packaging line switching between box sizes, the adjustable stroke lets operators quickly set a new push distance for a diverter arm, reducing downtime between batches.
In a clamping or pressing station, the stroke can be slightly extended over time to compensate for pad wear or tooling compression, maintaining consistent contact force without replacing the cylinder.
Choose this 80 mm bore when the 63 mm unit's 1559 N push at 0.5 MPa is borderline; if you need more force, the 100 mm bore offers 3927 N. The 30 mm adjustable stroke is ideal for commissioning trials or format changeovers where the exact stop position must be dialled in on the machine. For a fixed-stroke application, the standard SC80X250 is a simpler alternative. A direct replacement must match the 80 mm bore, 250 mm nominal stroke, -30 adjust range, PT3/8 ports, and basic mounting. For strokes of 250 mm or more, consider an external guide or a guided cylinder if the rod sees significant side load, as the 25 mm rod can bend under off-axis forces.
Adjustable-stroke checklist
At 0.5 MPa, 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. The pull force is lower because the 25 mm rod reduces the effective piston area on the return stroke.
Yes, the SCJ80X250-30 has the same 80 mm bore, PT3/8 ports, and 250 mm nominal stroke as the SC80X250. The adjustable rear screw adds 30 mm of stroke-end reduction, so it can be a drop-in upgrade if you need field adjustability and have clearance for the slightly longer body (239 mm A dimension).
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