The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X160-75S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø250mm bore, 160mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X160-75S is a heavy-duty double-acting single-rod pneumatic cylinder with a field-adjustable stroke, delivering 24544 N of push force at 0.5 MPa. The rear-cap adjusting screw provides up to 75 mm of stroke-end reduction, allowing precise mechanical tuning without swapping the cylinder or adding external hard stops.
This ISO 6430 class tie-rod cylinder uses a 50 mm diameter piston rod and a PT1 inch port. The adjustable air cushion, with a 40 mm cushion length, decelerates the massive 5006 kgf theoretical load smoothly. The built-in magnet enables direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X160-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 160 mm |
| Stroke adjustment | Up to 75 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1" |
| Rod thread | M42×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 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 | 24544 N | 23562 N |
| 0.7 MPa | 34361 N | — |
| Max (@1.0 MPa) | 5006 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. |
|---|---|
| 250 | Bore size in mm. |
| ×160 | Nominal (maximum) stroke length in mm. |
| -75 | 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 final pressing depth in large hydraulic-pneumatic forming presses during commissioning or after tooling changes, using the 75 mm adjustment screw to set the exact stop position.
Set the precise open/close stroke of a massive gate or butterfly valve in water treatment or mining slurry lines, compensating for seat wear over time without removing the actuator.
Adjust the retract position of a log fence on a large sawmill carriage to accommodate different diameter logs, making format changeovers fast and repeatable with the screw adjustment.
For applications needing slightly less force, the 200 mm bore SCJ provides 15708 N of push force at 0.5 MPa. If a fixed stroke is acceptable, the standard SC series offers a simpler, more compact solution. This SCJ250X160-75S is a direct replacement for another AirTAC SCJ cylinder of the same 250 mm bore, 160 mm nominal stroke, 75 mm adjust range, PT port thread, and magnetic piston configuration. For strokes over 300 mm in this bore, evaluate side-loading on the 50 mm rod and consider an external guide or a guided cylinder to prevent rod bending.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 24544 N and the pull force is 23562 N. The maximum push force at 0.9 MPa is 44178 N. The theoretical maximum force at 1.0 MPa is 5006 kgf.
A mechanical screw in the rear cap limits the piston's retract stroke end. By turning the screw, you can shorten the effective stroke by up to 75 mm from the nominal 160 mm. This is a mechanical stroke-end adjustment, not a speed or force control, and it does not lock the piston in place when air pressure is lost.
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