The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X25-20 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. Ø250mm bore, 25mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X25-20 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw, allowing the stroke end position to be field-tuned by up to 20 mm without replacing the unit. In this 250 mm bore class, it delivers a substantial 24544 N of push force at 0.5 MPa, making it suitable for heavy-duty clamping and pressing applications where the final stop position must be dialled in precisely during commissioning or after tooling wear.
This ISO 6430 class tie-rod cylinder uses a 50 mm diameter piston rod and a PT1 inch port. Its adjustable air cushion, with a 40 mm cushion length, provides smooth deceleration for high-inertia loads. The body length A(SCJ) is 409 mm, and the standard operating speed range for this bore is 30-500 mm/s.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X25-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 25 mm |
| Stroke adjustment | Up to 20 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. |
| ×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.
Fine-tune the final pressing depth on a large assembly press to compensate for variations in component stack-up height, ensuring consistent joint quality without mechanical shims.
Periodically adjust the clamp stroke end to take up wear on gripper pads or tooling surfaces in a heavy machining fixture, maintaining full clamping force without replacing the actuator.
Quickly reset the end position for different product sizes on a bulk-handling gate or diverter, eliminating the need for manual stop adjustments and reducing changeover downtime.
For applications needing less force, stepping down to a 200 mm bore SCJ reduces push force to 15708 N at 0.5 MPa. If the stroke length is fixed and never requires field adjustment, the standard SC250X25 fixed-stroke cylinder is a more economical choice. This SCJ model is a direct replacement for an existing AirTAC SCJ250X25-20 cylinder with PT ports and basic mounting; ensure the nominal stroke and 20 mm adjustment range match.
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 the 0.9 MPa operating limit is 44178 N. Because this is a single-rod cylinder, the pull force is lower due to the 50 mm rod area.
Yes, provided the bore (250 mm), nominal stroke (25 mm), and port thread (PT1 inch) match. The SCJ body is slightly longer to accommodate the adjusting screw, so verify the available space. The adjusting screw allows you to shorten the effective stroke by up to 20 mm from the nominal maximum.
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