The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X100-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø250mm bore, 100mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X100-50S is a large-bore, double-acting single-rod pneumatic cylinder from AirTAC, engineered for heavy-duty applications where the stroke end position must be fine-tuned in the field. Its rear-cap adjusting screw provides up to 50 mm of stroke-end reduction, allowing operators to dial in the exact stopping point for a 100 mm nominal stroke without swapping the cylinder. With a 50 mm diameter piston rod and a PT1" port, this ISO 6430 class tie-rod cylinder delivers a substantial 24544 N of push force at 0.5 MPa.
This model includes a built-in magnet (S suffix), enabling direct mounting of CMSG, DMSG, or EMSG sensors on the barrel for reliable end-of-stroke or mid-stroke position feedback. The variable air cushion, with a 40 mm cushion length, decelerates the massive piston smoothly, protecting tooling. The body length A(SCJ) is 409 mm, and it operates within a pressure range of 0.15 to 1.0 MPa, with a maximum push force of 44178 N at 0.9 MPa.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X100-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 100 mm |
| Stroke adjustment | Up to 50 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. |
| ×100 | Nominal (maximum) stroke length in mm. |
| -50 | 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.
During the setup of a large hydraulic-style pneumatic press, the 50 mm adjustable stroke allows technicians to precisely set the final pressing depth for different tooling stacks, ensuring consistent part forming without mechanical shims.
In a high-cycle welding fixture for large structural frames, the stroke can be incrementally extended over time to compensate for wear on the clamp pads, maintaining a 24544 N clamping force without replacing the entire actuator.
For diverting heavy pallets on a conveyor line, the adjustable stroke end-stop allows maintenance teams to fine-tune the diverter arm's final position to perfectly align with different lane widths, a task easily performed with a wrench.
Choose the SCJ250 for applications demanding the highest force in the SCJ series, such as pressing, clamping, or lifting heavy loads. If your force requirement is lower, stepping down to the 200 mm bore SCJ200X100-50 reduces push force to 15708 N at 0.5 MPa, which may allow for a smaller, more energy-efficient system. Conversely, if a fixed stroke is acceptable and adjustability is not required, the standard SC series offers a simpler, cost-effective alternative. For a direct replacement, match the 250 mm bore, 100 mm nominal stroke, 50 mm adjust range, PT port thread, and the built-in magnet (-S).
For this 100 mm stroke, the piston rod is well-supported within the cylinder, but for any application with a significant side load, an external guide rail or a switch to a guided cylinder is strongly recommended to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 24544 N and the pull force is 23562 N due to the 50 mm single rod. The maximum push force at 0.9 MPa is 44178 N. The theoretical force at 1.0 MPa is 5006 kgf.
A rear-cap screw mechanically limits the piston's retraction, shortening the stroke end by up to 50 mm. This sets a precise physical stop, but it is not a locking device. If air pressure is lost, the cylinder will not hold its position; an external rod lock or pilot-operated check valve is required for load holding.
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