The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X450-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø250mm bore, 450mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X450-40S is a heavy-duty double-acting single-rod cylinder delivering 24544 N of push force at 0.5 MPa, built for large-scale automation that demands on-the-fly stroke tuning. Its rear-cap adjusting screw provides up to 40 mm of stroke-end reduction, so you can dial in the exact stop position during commissioning or format changes without swapping the cylinder.
This model carries the -S magnet suffix, embedding a magnet in the piston for direct mounting of CMSG/DMSG/EMSG sensors. With a 50 mm rod, PT1 inch ports, and a 40 mm air cushion, it handles controlled deceleration of high-inertia loads. The ISO 6430 class tie-rod body has a length A of 409 mm, and the 450 mm nominal stroke is well within the 1500 mm maximum standard stroke for this bore.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X450-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 450 mm |
| Stroke adjustment | Up to 40 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. |
| -40 | 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 material feed stop position on a 2000-ton stamping press line. The 40 mm adjustment range allows operators to compensate for die wear or material thickness changes without dismounting the large cylinder.
Adjust the end-stop for a log kicker or sorting gate. The 24544 N push force at 0.5 MPa moves heavy timber reliably, while the screw adjuster sets the precise gate opening for different log diameters.
Set the final position of a hot-roller guide. The built-in magnet allows engineers to mount CMSG sensors for position feedback, confirming the guide is at the correct stroke end after a 40 mm adjustment.
Choose the SCJ250 when your application needs the 24544 N push force class of a 250 mm bore. If force requirements drop, stepping down to a 200 mm bore SCJ200X450-40S reduces push force to 15708 N at 0.5 MPa, saving energy and physical space. For applications needing only a fixed end position, the standard SC250X450 offers a simpler, non-adjustable alternative.
At 450 mm of stroke, side-loading and rod buckling become critical design factors. Ensure the load is guided externally or use a clevis mounting with a rod-end alignment coupler. As a direct replacement, match this SCJ250X450-40S with another genuine AirTAC unit of identical bore, 450 mm nominal stroke, 40 mm adjust range, PT thread, and the -S magnet option.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N (due to the 50 mm single rod). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 5006 kgf. The 40 mm adjustable stroke screw does not alter the cylinder's force output.
A screw in the rear cap acts as an internal end-stop, allowing you to shorten the stroke by up to 40 mm from the nominal 450 mm. It adjusts the retracted end position only and is intended for fine-tuning during setup, not as a dynamic actuator. For full compatibility, replace with another SCJ250X450-40S with matching PT ports and -S magnet.
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.