The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X300-75 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, 300mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X300-75 is a double-acting, single-rod pneumatic cylinder built on a robust tie-rod design, delivering a substantial 24544 N of push force at 0.5 MPa. Its defining feature is a rear-cap adjusting screw that provides up to 75 mm of field-adjustable stroke-end reduction, allowing engineers to fine-tune the piston's stopping position without swapping the cylinder or adding external hard stops. This ISO 6430 class cylinder uses a 50 mm diameter piston rod and 1 inch PT ports.
With a 300 mm nominal stroke and a 40 mm air cushion, the SCJ250X300-75 is engineered for heavy-duty applications where commissioning trials, format changeovers, or wear compensation demand precise end-position control. The adjustable screw sets only the stroke end, not the force or speed, maintaining the cylinder's full 44178 N theoretical push at 0.9 MPa. Its body length A(SCJ) is 409 mm, providing a compact footprint for its force class.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X300-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 300 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. |
| ×300 | 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.
Fine-tune the final pressing depth in a 250-ton class forming press. The 75 mm adjustment range lets operators dial in the exact material compression point during setup without mechanical modifications.
Adjust the stroke end of a diverter gate on a mining or aggregate conveyor. The screw adjustment compensates for wear on the gate seal over time, maintaining a positive shut-off with 24544 N of push force.
Set the mechanical end-stop for a roll gap actuator in a steel processing line. The SCJ250X300-75 allows rapid stroke-end changes during product changeovers, handling the high forces required for heavy-gauge material.
Select the SCJ250X300-75 when your application requires a high-force actuator with field-tunable stroke end positioning. If the 24544 N push at 0.5 MPa is more force than needed, stepping down to a 200 mm bore SCJ reduces push force to 15708 N, potentially saving energy and space. For applications needing a fixed, non-adjustable stroke, the standard SC series is a more economical choice. This cylinder is a direct replacement for another AirTAC SCJ250 adjustable-stroke cylinder with a 300 mm nominal stroke, 75 mm adjust range, and PT ports. For strokes of 300 mm or more, always evaluate side-loading: if the rod is subject to lateral forces, use an external guide rail or switch to a guided cylinder to prevent rod bending and premature 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. The push force is higher because the single rod reduces the piston area on the pull side. The maximum theoretical push force at 1.0 MPa is 5006 kgf.
Yes, it can replace a fixed-stroke cylinder if you need the ability to fine-tune the stroke end. To be a direct dimensional match, the replacement must be another AirTAC SCJ250 with the same 300 mm nominal stroke, 75 mm adjust range, and PT port thread. The adjustable screw only shortens the stroke; it cannot extend it beyond 300 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.