The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X25-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø80mm bore, 25mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X25-20S is an 80 mm bore, double-acting single-rod cylinder with a rear adjusting screw that provides up to 20 mm of field-adjustable stroke reduction from the 25 mm nominal maximum. This model includes a built-in magnet (-S), enabling direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection without external brackets.
With a 25 mm rod diameter and PT3/8 ports, it delivers a substantial 2513 N of push force at 0.5 MPa, rising to 4523 N at the 0.9 MPa maximum operating pressure. The 21 mm air cushion at each end decelerates the piston smoothly, and the tie-rod construction keeps service straightforward. Body length A is 239 mm.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X25-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 25 mm |
| Stroke adjustment | Up to 20 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. |
| ×25 | Nominal (maximum) stroke length in mm. |
| -20 | 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 20 mm adjustment screw lets technicians dial in the exact retract stop position on a new assembly line without swapping cylinders or machining custom stops.
In high-cycle clamping or stopping gates, the adjustable stroke compensates for wear on the tooling or workpiece contact surface, maintaining consistent positioning over time.
The built-in magnet works with CMSG/DMSG sensors to confirm the 25 mm stroke completes, ideal for compact pick-and-place or ejection tasks where cycle verification is critical.
Choose the SCJ80X25-20S when you need to fine-tune a short stroke end position during commissioning or format changes. For applications requiring more force, stepping up to the 100 mm bore provides 3927 N of push at 0.5 MPa; for a lighter, more compact solution, the 63 mm bore offers 1559 N. If the stroke does not need field adjustment, a fixed-stroke SC80X25 cylinder is a simpler alternative.
This unit is a direct replacement for another AirTAC SCJ80 cylinder with a 25 mm nominal stroke and 20 mm adjustment range, provided the port thread (PT), basic mounting, and magnet option match. For strokes of 300 mm or more, evaluate side-loading on the 25 mm rod and consider an external guide or a guided cylinder to prevent rod bending.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder produces 2513 N of push force and 2268 N of pull force. The maximum push force at the 0.9 MPa operating limit is 4523 N. Pull force is lower due to the area of the 25 mm rod.
Yes, the SCJ80X25-20S uses the same mounting footprint as a basic SC80 and can replace it if you need the 20 mm stroke-end adjustment feature. Ensure the port size (PT3/8), magnet option, and mounting style match your existing setup.
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