The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X500-40 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, 500mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X500-40 is a double-acting, single-rod pneumatic cylinder engineered for heavy-duty applications requiring precise, field-adjustable stroke-end positioning. With a 250 mm bore and a nominal 500 mm stroke, the rear-cap adjusting screw provides a 40 mm retraction range, allowing operators to fine-tune the end position without removing the cylinder or adding external hard stops. The 50 mm diameter piston rod and PT1" port ensure robust air flow for demanding cycles.
Operating on filtered air from 0.15 to 1.0 MPa, this cylinder delivers a substantial 24544 N of push force at 0.5 MPa and up to 44178 N at 0.9 MPa. The pull force is 23562 N at 0.5 MPa due to the single-rod design. Built with a tie-rod construction and an adjustable air cushion, it handles speeds of 30-500 mm/s. The body length A(SCJ) is 409 mm, making it a compact powerhouse for its force class.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X500-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 500 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. |
| ×500 | 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 insertion depth of a heavy-duty assembly press. The 40 mm adjustment range allows operators to compensate for part tolerance variations without reprogramming the entire machine, ensuring consistent joint quality.
Control a diverter gate on a large-scale conveyor system. The adjustable stroke lets you set the exact gate opening for different pallet sizes, and the 24544 N push force at 0.5 MPa easily handles heavy or stuck materials.
Use as the primary actuator on a large welding or machining fixture. The rear screw allows quick stroke-end adjustment to accommodate different workpiece families, reducing setup time between production batches.
Select the SCJ250X500-40 when your application demands high force and the ability to dial in the exact stroke end during commissioning or changeovers. If your force requirement is lower, consider stepping down to the SCJ200 bore, which provides 15708 N of push force at 0.5 MPa. For applications needing a fixed, non-adjustable stroke, the standard SC series is a more economical choice. This model is a direct replacement for an existing AirTAC SCJ250X500-40 with PT ports, basic mounting, and no magnet. For strokes of this length, ensure the rod is adequately supported against side loads; if the load is not guided, use an external guide rail or switch to a guided cylinder to prevent rod bending and seal wear.
Adjustable-stroke checklist
The push force is 24544 N at 0.5 MPa and 44178 N at the maximum operating pressure of 0.9 MPa. The pull force is lower, at 23562 N at 0.5 MPa, because the 50 mm piston rod reduces the effective piston area on the return stroke. Always use the pull force value when sizing the cylinder for a retracting load.
For a direct, bolt-for-bolt replacement, you must match the bore (250), the nominal stroke (500), and the adjustment range (-40). A model with a different adjustment range, like a -50, will have a different mechanical stop position and may not fit your existing setup. Also ensure the port thread (PT), mounting style, and magnet option match your current cylinder.
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