The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X125-100S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø250mm bore, 125mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X125-100S is a heavy-duty double-acting single-rod cylinder with a field-adjustable stroke end, built for large-scale automation where fine-tuning the end position is critical. With a 250 mm bore and a 50 mm piston rod, it delivers a substantial 24544 N of push force at just 0.5 MPa, making it suitable for pressing, clamping, and material handling applications that demand high force with a compact footprint.
A rear-cap adjusting screw provides up to 100 mm of stroke-end reduction, allowing operators to dial in the exact stopping point without dismantling the cylinder or adding external hard stops. The integrated magnet enables direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection. As part of the ISO 6430 class for big bores, its body length A is 409 mm, and it uses a PT1 inch port with an M42x2 rod thread.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X125-100S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 100 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. |
| ×125 | Nominal (maximum) stroke length in mm. |
| -100 | 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 press stroke end by up to 100 mm during setup to achieve the exact insertion depth for large bearings or bushings without swapping tooling.
Adjust the cylinder's stop point to accommodate different pallet or product widths on a heavy-duty conveyor line, ensuring reliable diversion for mixed-format runs.
Periodically adjust the stroke end to compensate for jaw or fixture wear in a high-cycle welding or machining clamp, maintaining consistent clamping force over time.
Choose the SCJ250 when your application requires a thrust class around 24544 N push at 0.5 MPa. If you need a step down in force, the SCJ200 offers 15708 N push at the same pressure. The 100 mm adjustable range is ideal for commissioning trials or processes that need periodic stroke-end recalibration. For fixed-stroke needs without adjustment, the standard SC series is a more economical alternative.
To replace this cylinder, match the 250 mm bore, 125 mm nominal stroke, 100 mm adjust range, PT port thread, and the built-in magnet. This model uses a basic mount; if pivoting is required, specify the TC centre trunnion with the TCM1 bracket. For strokes of this length, always evaluate side-loading on the 50 mm rod; an external guide rail or a switch to a guided cylinder may be necessary to prevent rod bending and seal wear.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this cylinder produces 24544 N of push force and 23562 N of pull force. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 5006 kgf. The push force is greater than the pull force because of the single-rod design.
Yes, if you need field adjustability. The SCJ250X125-100S is a direct dimensional replacement for an SC250X125 with the same mounting and port configuration, but it adds a rear adjusting screw that allows you to shorten the stroke end by up to 100 mm. Ensure your machine has clearance for the slightly longer body length A of 409 mm.
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.