The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X400-30S 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, 400mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X400-30S is a heavy-duty double-acting single-rod cylinder with a field-adjustable stroke end, delivering 24544 N of push force at 0.5 MPa. Its rear-cap screw provides up to 30 mm of stroke-end adjustment, making it ideal for commissioning large-scale machinery where the final stop position must be dialled in precisely without dismounting the cylinder.
This ISO 6430 class tie-rod cylinder features a 50 mm diameter piston rod, a 1-inch PT port, and an adjustable air cushion with a 40 mm cushion length. The built-in magnet (denoted by the -S suffix) allows direct mounting of CMSG/DMSG/EMSG sensors along the barrel for reliable end-of-stroke detection, while the body length A is 409 mm for the base cylinder.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X400-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 400 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. |
| ×400 | 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.
In large hydraulic-style pneumatic presses, the 30 mm adjustment range allows operators to compensate for tooling stack-up tolerances or material thickness variations, ensuring consistent final press depth without mechanical shims.
Controls a large diverter gate on a conveyor for mining or aggregate. The adjustable stroke lets technicians fine-tune the gate's open position to manage flow rates precisely, adapting to different material densities on the fly.
During the commissioning of a structural assembly jig, the SCJ250X400-30S provides 24544 N of clamping force. The rear screw adjustment is used to set the final clamp position perfectly, accounting for fixture fabrication variances.
Choose the SCJ250X400-30S when your application demands high thrust and the ability to fine-tune the stroke end position during setup or after wear. If 24544 N of push force at 0.5 MPa is more than required, stepping down to the 200 mm bore SCJ200 series reduces push force to 15708 N at the same pressure, potentially saving space and air consumption. For applications needing a fixed, non-adjustable stroke, the standard SC250 series is a direct alternative.
At a 400 mm nominal stroke, consider the potential for side loading on the 50 mm rod. If the load is not guided externally, rod deflection can accelerate seal wear and reduce bearing life. In such cases, pair the cylinder with an external linear guide or evaluate a guided cylinder assembly. For replacement, match the 250 mm bore, 400 mm nominal stroke, 30 mm adjustment range, PT port thread, basic mounting, and the integrated magnet sensor option.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, 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 pull force is lower because the 50 mm piston rod reduces the effective area on the return stroke.
Yes, if you need the added benefit of a field-adjustable stroke end. The SCJ250X400-30S matches the SC250's bore, port size, and mounting footprint but includes a rear adjusting screw. Ensure your machine has clearance for the slightly longer body length A of 409 mm and that the 30 mm adjustment range suits your process.
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.