The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X350-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø250mm bore, 350mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X350-20S is a heavy-duty adjustable-stroke cylinder delivering 24544 N of push force at 0.5 MPa, ideal for large-scale industrial automation where stroke end position needs fine-tuning. Its 50 mm diameter piston rod and 40 mm air cushion provide robust deceleration, while the rear adjusting screw offers up to 20 mm of stroke-end adjustment without removing the cylinder from the machine.
This double-acting, single-rod cylinder features a built-in magnet (suffix -S), allowing direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection. The body length A(SCJ) is 409 mm, and it uses a PT1 inch port. It is part of the ISO 6430 class for large bore tie-rod cylinders, suited for pressing, clamping, and material handling tasks.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X350-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 350 mm |
| Stroke adjustment | Up to 20 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. |
| ×350 | Nominal (maximum) stroke length in mm. |
| -20 | 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 final pressing depth in bearing or bushing insertion stations. The 20 mm adjust range allows operators to compensate for part tolerance stack-ups without reprogramming the press.
Use as an adjustable end-stop on a conveyor for large pallets or engine blocks. The stroke can be easily shortened to accommodate different product lengths during a batch changeover.
In large welding fixtures, the adjustable stroke compensates for wear on clamp pads over time. The built-in magnet provides sensor confirmation that the clamp has reached its adjusted closed position.
Select the SCJ250 bore when your application demands a push force around 24544 N at 0.5 MPa. If your load is lighter, stepping down to the 200 mm bore reduces push force to 15708 N, saving energy and space. For fixed-stroke applications, the standard SC series is a simpler alternative, but the SCJ is essential when you need to dial in the stroke end during commissioning or for format changes.
At this 350 mm stroke, consider external guides or a guided cylinder if significant side loads are present, as the rod is not designed to support bending moments. For replacement, match this model exactly: SCJ250X350-20S, a 250 mm bore with 350 mm nominal stroke, 20 mm adjust range, PT1 inch ports, and the built-in magnet.
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. Because it is a single-rod cylinder, the pull force is lower due to the rod area.
A rear-cap adjusting screw lets you shorten the stroke end by up to 20 mm. The nominal 350 mm stroke is the maximum. You can replace a fixed-stroke SC cylinder of the same bore if you need field adjustability, but you must match the port size (PT1"), mounting, and ensure the SCJ's slightly longer body length fits your machine.
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