The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X500-75 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, 500mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X500-75 delivers massive force in a field-adjustable package, generating 24544 N of push and 23562 N of pull at 0.5 MPa. Its rear-cap adjusting screw provides up to 75 mm of stroke-end reduction, letting you fine-tune the stopping position for large-scale pressing, clamping, or material-handling tooling without swapping the cylinder.
This big-bore cylinder uses a 50 mm diameter rod and a 1-inch PT port, with a generous 40 mm air cushion to decelerate heavy loads smoothly. The body length A is 409 mm, and the unit is rated for strokes up to 1500 mm. At the maximum operating pressure of 0.9 MPa, it exerts a formidable 44178 N of push force.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X500-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 500 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. |
| ×500 | 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.
During commissioning of a 20-ton press, the 75 mm adjustable stroke allows operators to dial in the exact shut height for different die sets without machining new spacers.
In a hot-steel handling line, the screw adjuster compensates for wear on the stop plate, maintaining precise billet positioning without taking the cylinder offline for a stroke change.
When switching between thin and thick veneer stacks, the adjustable stroke end lets the SCJ250 adapt the platen closing distance in minutes, avoiding the downtime of a full cylinder swap.
Choose the SCJ250 bore when your application demands over 20000 N of force at standard plant air. If your load is lighter, stepping down to the SCJ200 bore (15708 N push at 0.5 MPa) can reduce air consumption and physical size. For a fixed-stroke solution without the adjustable screw, the standard SC250 cylinder is a direct alternative. To replace this unit, match the 250 mm bore, 500 mm nominal stroke, 75 mm adjustment range, and PT port thread. At this 500 mm stroke, ensure the rod is externally guided or use a guided cylinder to prevent side-load deflection and seal wear.
Adjustable-stroke checklist
A screw in the rear cap limits the piston's return stroke. By turning it, you can shorten the effective stroke from the nominal 500 mm down to 425 mm in fine increments. It adjusts the stroke end position only; it does not change the cylinder's 24544 N push force at 0.5 MPa.
Yes, if you need the ability to tune the stroke end. It directly replaces another AirTAC SCJ250 with the same 500 mm nominal stroke and 75 mm adjust range. Ensure your mounting (basic, foot, or trunnion) and 1-inch PT port thread match your current setup.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.