The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X450-30 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø250mm bore, 450mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X450-30 is a heavy-duty double-acting single-rod cylinder with a rear-cap adjusting screw, delivering 24544 N of push force at 0.5 MPa (pull force is 23562 N, accounting for the 50 mm rod). The 30 mm stroke-end adjustment lets you fine-tune the piston stop position on the machine without dismounting the cylinder, which is invaluable during commissioning or for compensating for tooling wear over long production runs.
This ISO 6430 class tie-rod cylinder uses a 50 mm diameter rod, PT1" ports, and an M42x2 rod thread. The adjustable air cushion (40 mm length) decelerates the piston smoothly at both ends. With a body length A(SCJ) of 409 mm, it handles strokes up to 1500 mm as standard. The default configuration includes a TPU seal for -20 to +70 °C, PT threads, and a basic mount.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X450-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 450 mm |
| Stroke adjustment | Up to 30 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. |
| -30 | 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 forming or stamping presses, the 30 mm adjusting screw allows operators to quickly fine-tune the final pressing depth for different material thicknesses or tooling setups without changing the hard tooling.
Controls a diverter gate on a heavy conveyor line. The adjustable stroke lets maintenance staff compensate for wear on the gate's sealing edge, maintaining a perfect seal without replacing the entire actuator.
During the commissioning of a large robotic welding cell, the SCJ250's stroke can be incrementally adjusted to synchronize the movement of a heavy fixture clamp with the robot's path, eliminating mechanical interference risks.
Choose the SCJ250 when you need a field-adjustable stroke end on a large-bore cylinder. If your force requirement is lower, stepping down to the 200 mm bore reduces push force to 15708 N at 0.5 MPa. For a fixed stroke without the adjustment screw, the standard SC250 is a simpler alternative. At a 450 mm nominal stroke, ensure the rod is adequately supported against side loads; an external guide rail or a guided cylinder should be used if the load is not perfectly axial to prevent rod bending and premature seal wear.
This model is a direct replacement for another AirTAC SCJ250X450-30 adjustable-stroke cylinder with the same bore, 450 mm nominal stroke, 30 mm adjust range, PT ports, and basic mounting. It does not include a magnet, so position sensing requires external limit switches.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 24544 N and the pull force is 23562 N. The maximum push force at the 0.9 MPa operating limit is 44178 N. The pull force is lower because the 50 mm piston rod reduces the effective area on the return stroke.
Yes, if you need the 30 mm stroke-end adjustment feature. The SCJ250X450-30 has the same bore, nominal stroke, and mounting interfaces as a fixed-stroke SC250, but its body is slightly longer to house the rear adjusting screw. Ensure your machine has clearance for the longer body length A(SCJ) of 409 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.