The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X500-75S 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, 500mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X500-75S is a large-bore, double-acting single-rod cylinder that brings field-adjustable stroke control to heavy-duty automation. Its rear-cap adjusting screw provides up to 75 mm of fine-tuning on the stroke end position, allowing engineers to dial in the exact stopping point for commissioning, format changes, or wear compensation without swapping the cylinder. With a 250 mm bore, it generates a substantial 24544 N of push force at 0.5 MPa, scaling to 44178 N at the maximum operating pressure of 0.9 MPa.
This ISO 6430 class tie-rod cylinder uses a 50 mm diameter piston rod with an M42x2 thread and PT1 inch ports. The built-in magnet, designated by the -S suffix, allows for direct mounting of CMSG, DMSG, or EMSG sensors along the barrel for precise, non-contact position feedback. The body length A(SCJ) is 409 mm, and the adjustable air cushion provides controlled deceleration at the end of the 500 mm nominal stroke.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X500-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 500 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. |
| ×500 | 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.
In large-scale paper or textile calenders, the 75 mm adjustable stroke allows operators to precisely set the roll gap for different material thicknesses without mechanical shimming, using the cylinder's full 24544 N force.
For water control gates, the SCJ250X500-75S provides a robust 500 mm nominal stroke. The rear adjustment screw enables fine-tuning of the closed-gate seal position to account for wear or debris buildup over time.
The adjustable stroke end allows a diverter chute to be precisely aligned for different material paths. The cylinder's 44178 N max force at 0.9 MPa and built-in magnet for end-of-stroke sensors ensure reliable, monitored operation in a demanding environment.
Choose the SCJ250X500-75S when your application demands a powerful, high-force linear motion with the ability to fine-tune the stroke end on the machine. If the 24544 N push force at 0.5 MPa is more than required, stepping down to a 200 mm bore reduces the force to 15708 N while maintaining the same 75 mm adjustment range. For applications that do not require stroke adjustability, a fixed-stroke SC250X500 cylinder is a simpler alternative. This model is a direct replacement for another AirTAC SCJ cylinder of the same bore, 500 mm nominal stroke, 75 mm adjust range, PT port thread, and magnet configuration. For this 500 mm stroke length, be mindful of side-loading on the rod; use an external guide or consider a guided cylinder if the load is not perfectly axial.
Adjustable-stroke checklist
As a single-rod cylinder, the push and pull forces are different. At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. At the maximum operating pressure of 0.9 MPa, the push force increases to 44178 N. The theoretical maximum force at 1.0 MPa is 5006 kgf.
No. The SCJ250X500-75S is not designed for load holding. If air pressure is lost or the control valve is centered, the piston will drift or the load will drop. The stroke adjustment screw only sets the end-of-stroke position and the air cushion only decelerates the piston; neither acts as a mechanical lock. For load holding, you must add an external rod brake, a mechanical lock, or a pilot-operated check valve.
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