The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X275-40S 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, 275mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X275-40S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the 275 mm nominal stroke by up to 40 mm without swapping the unit. Its 25 mm diameter piston rod and PT3/8 ports deliver a robust 2513 N of push force at 0.5 MPa, scaling to 4523 N at the maximum operating pressure of 0.9 MPa.
A built-in magnet is integrated into the piston, so standard CMSG/DMSG/EMSG reed and solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The adjustable air cushion decelerates the piston smoothly, and the 239 mm base body length provides a compact footprint for its force class.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X275-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 275 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. |
| ×275 | 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 275 mm stroke end during machine bring-up using the rear adjusting screw, accommodating stack-up tolerances without needing to machine custom external stops.
Quickly adjust the pusher stroke from 235 mm to 275 mm on a packaging line when switching between box sizes, minimizing downtime between production runs.
Take up mechanical wear in a clamping or pressing fixture over time by advancing the stroke end slightly, maintaining consistent contact force without replacing the actuator.
This 80 mm bore model suits applications needing a mid-range push force of 2513 N at 0.5 MPa. If your load requires more force, stepping up to a 100 mm bore SCJ delivers 3927 N at the same pressure; for a lighter, more compact solution, the 63 mm bore provides 1559 N. The 40 mm adjustment range is ideal for commissioning trials where the final stroke length is determined on the machine.
For a direct replacement, match the 80 mm bore, 275 mm nominal stroke, 40 mm adjust range, PT port thread, and the -S magnet option. At this 275 mm stroke, ensure the rod is not subjected to high side loads; if lateral forces are present, pair the cylinder with an external linear guide or consider a guided cylinder to prevent rod bending and premature seal wear.
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. Because this is a single-rod cylinder, the push force is greater than the pull force due to the area of the 25 mm rod.
No, the SCJ80X275-40S is a standard double-acting cylinder and will not hold its position if air pressure is exhausted or the directional valve is centered. The adjustable air cushion only decelerates the piston near the stroke end; it is not a locking or braking feature. To hold a load without live pressure, you must add an external mechanical lock, a rod brake, or a pilot-operated check valve.
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