The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X25-30S 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, 25mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X25-30S is a double-acting, single-rod pneumatic cylinder with a rear adjusting screw that provides up to 30 mm of field-adjustable stroke reduction from the 25 mm nominal maximum. This lets commissioning engineers dial in the exact end position without swapping the cylinder or adding external hard stops. At 0.5 MPa, it delivers 2513 N of push force and 2268 N on the pull stroke, driven through a 25 mm diameter piston rod.
Built on an 80 mm bore tie-rod body with a PT3/8 port, this unit includes a built-in magnet (-S suffix) so CMSG/DMSG/EMSG reed or solid-state sensors can be clamped directly onto the barrel for end-of-stroke sensing. The adjustable air cushion decelerates the piston smoothly, and the 28 mm cushion length helps absorb energy in fast-cycle applications. The body length A(SCJ) is 239 mm, making it a compact solution for space-constrained setups needing precise stroke tuning.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X25-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 25 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. |
| ×25 | 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.
Fine-tune the retract stroke end on a clamping fixture during setup without loosening mounting bolts. The 30 mm adjustment screw lets operators dial in the exact jaw position for different workpiece thicknesses.
Adjust the push stroke on a diverter gate when switching between product sizes on a packaging line. The rear screw provides quick, repeatable stroke changes without disassembling the actuator.
Take up mechanical wear in a press or forming tool over time. The adjustable stroke end compensates for tooling creep, maintaining consistent part dimensions without replacing the cylinder.
Choose the SCJ80 bore when your application needs around 2500 N of push force at standard shop air. If you require less force, stepping down to the 63 mm bore (1559 N push at 0.5 MPa) saves space and air consumption; for higher force, the 100 mm bore delivers 3927 N push. This adjustable-stroke model is ideal where the stroke end must be fine-tuned on the machine—if your stroke is truly fixed, the standard SC80 cylinder is a simpler, lower-cost alternative. For a direct replacement, match an SCJ80 with a 25 mm nominal stroke, 30 mm adjust range, PT3/8 ports, basic mounting, and the -S magnet option.
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 1.0 MPa, the theoretical push force reaches 5026 N. The pull force is lower because the rod reduces the effective piston area on the return stroke.
Only if you need the adjustable stroke feature. The SCJ80 body is slightly longer than the fixed-stroke SC80 to house the rear adjusting screw. You must match the nominal stroke (25 mm), port thread (PT3/8), and magnet option. If you don't need stroke adjustment, the standard SC80 is a direct dimensional replacement for another SC80.
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