The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X50-30 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. Ø250mm bore, 50mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X50-30 is a double-acting, single-rod pneumatic cylinder from AirTAC, engineered for heavy-duty applications where the stroke end position must be fine-tuned on the machine. With a 250 mm bore and a nominal 50 mm stroke, the rear adjusting screw provides up to 30 mm of stroke-end reduction, enabling precise setup without dismounting the cylinder. It delivers a substantial 24544 N of push force at 0.5 MPa, rising to 44178 N at the maximum operating pressure of 0.9 MPa.
This ISO 6430 class tie-rod cylinder features a 50 mm diameter piston rod with an M42x2 thread and a G1 inch port for high flow. The adjustable air cushion, with a 40 mm cushion length, decelerates the large mass smoothly at the end of travel. The body length A(SCJ) is 409 mm, providing a robust and compact envelope for its force class. The standard operating temperature range is -20 to +70 °C with the default TPU seals.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X50-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 50 mm |
| Stroke adjustment | Up to 30 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. |
| ×50 | 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.
The 30 mm adjustment range allows operators to precisely set the final pressing depth on a large hydraulic-pneumatic forming press, accommodating different material thicknesses or tooling wear without reprogramming the entire stroke.
Ideal for commissioning high-torque butterfly or gate valves, where the cylinder's stroke end can be incrementally adjusted to perfectly match the valve's open/close positions, preventing seat damage from over-travel.
Used in a mechanical stop application on a rolling mill, the SCJ250X50-30 provides a powerful, field-adjustable hard stop for setting the initial roll gap, with the 44178 N max force holding the position against process loads.
Choose the SCJ250X50-30 when you need a very high force output in a compact 50 mm stroke, but require the ability to dial in the exact end position during commissioning or for wear take-up. If the 24544 N push force at 0.5 MPa is more than required, stepping down to the 200 mm bore SCJ series provides 15708 N of push force. For applications needing a fixed, non-adjustable stroke, the standard SC250X50 is a direct alternative. A replacement must match the 250 mm bore, 50 mm nominal stroke, 30 mm adjustable range, and PT port thread. For strokes of 50 mm, side-loading is typically minimal, but for any off-axis force, an external guide rail is recommended to protect the rod and bearings.
Adjustable-stroke checklist
At 0.7 MPa operating pressure, the push force is 34361 N and the pull force is 23562 N. The pull force is lower because the air pressure acts on a reduced piston area on the rod side. The maximum push force at 0.9 MPa is 44178 N.
Yes, provided the mounting and porting match. The SCJ250X50-30 is a direct dimensional replacement for an AirTAC SC250X50 with the same basic mounting, but it adds the 30 mm adjustable stroke-end feature. Ensure the slightly longer rear cap to accommodate the adjusting screw fits your machine's envelope.
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