The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X450-100S 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, 450mm nominal stroke, PT1" ports and adjustable end cushioning.
The AirTAC SCJ250X450-100S is a heavy-duty, tie-rod, double-acting single-rod cylinder from the SCJ series, equipped with a rear-cap adjusting screw that provides a 100 mm field-adjustable stroke-end range. This allows precise fine-tuning of the piston's end position without removing the cylinder, ideal for large-scale commissioning and format changes. With a 250 mm bore and a nominal 450 mm stroke, it delivers a substantial 24544 N of push force at 0.5 MPa, making it suitable for the most demanding industrial clamping, pressing, and positioning tasks.
This model features a built-in magnet, designated by the 'S' suffix, enabling direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors for reliable, non-contact end-of-stroke detection. The cylinder incorporates a 50 mm diameter piston rod with an M42x2 thread, PT1 inch ports, and an adjustable air cushion of 40 mm to decelerate heavy loads smoothly. Its body length A(SCJ) is 409 mm, and as a 250 mm bore unit, it falls within the ISO 6430 class for tie-rod cylinders.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X450-100S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 450 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. |
| ×450 | 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.
In large hydraulic-style pneumatic presses, the 100 mm adjust range allows operators to quickly change the final pressing depth for different tooling or material thicknesses without mechanical shims, using the full 24544 N push force at 0.5 MPa.
For palletizing systems handling heavy loads, the adjustable stroke lets technicians fine-tune the pusher's end position to accommodate slight variations in pallet size or product stack height, ensuring consistent layer formation.
During commissioning of large welding or assembly fixtures, the rear screw provides a wear-free way to dial in the exact clamping stroke for different product variants, with the built-in magnet confirming full clamp engagement via sensors.
Select the SCJ250X450-100S when your application requires a high-force actuator with the ability to fine-tune the stroke end position by up to 100 mm on the machine. If your force calculation shows a need for roughly 24500 N at 0.5 MPa, this bore is correct. If you require significantly less force, stepping down to the 200 mm bore SCJ200 series, which provides 15708 N of push force at the same pressure, can reduce air consumption and physical footprint. For applications needing a fixed, non-adjustable stroke, the standard SC250 series is the direct alternative.
For this 450 mm stroke length, be aware of potential side-loading and rod bending. If the load is not perfectly guided and axially aligned with the piston rod, an external guide rail or a switch to a guided cylinder is strongly recommended to prevent premature seal wear and rod damage. As a direct replacement, match this model with another SCJ cylinder of identical 250 mm bore, 450 mm nominal stroke, 100 mm adjust range, PT port thread, and the -S magnet option.
Adjustable-stroke checklist
The push force is determined by the 250 mm bore and operating pressure, delivering 24544 N at 0.5 MPa and up to 44178 N at the maximum 0.9 MPa operating pressure. The 100 mm adjustable stroke screw only changes the physical end position of the piston rod; it does not alter the cylinder's output force.
It can if you need the added benefit of a field-adjustable stroke end. The SCJ250 series shares the same mounting footprint and port sizes as the fixed-stroke SC250. To be a direct functional replacement, ensure the new unit matches the 250 mm bore, has a nominal stroke of at least 450 mm, uses PT ports, and includes the -S magnet option if you require sensor feedback.
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