The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X50-10 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø250mm bore, 50mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X50-10 is a large-bore, double-acting adjustable-stroke cylinder delivering 24544 N of push force at 0.5 MPa, making it suitable for heavy pressing, clamping, and positioning tasks. Its rear-cap adjusting screw provides a 10 mm stroke-end reduction range, allowing operators to fine-tune the piston stop position without dismounting the 50 mm rod or altering the cylinder's mounting.
This ISO 6430 class tie-rod cylinder features a 1-inch PT port and a robust M42x2 rod thread. The integrated air cushion (40 mm length) decelerates the piston smoothly, protecting the end cap during high-energy stops. The body length A for this model is 409 mm, providing a compact footprint for its force class.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X50-10 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 50 mm |
| Stroke adjustment | Up to 10 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. |
| ×50 | Nominal (maximum) stroke length in mm. |
| -10 | 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 bottom-dead-center of a large pneumatic press by adjusting the stroke end with the 10 mm screw, ensuring consistent part compression without over-travel.
Set a precise mechanical stop for a roll gap in a rolling mill. The 24544 N push force provides ample power, while the 10 mm adjustment compensates for roll wear over time.
Calibrate the stroke of a large linear valve actuator on-site. The adjustable screw allows for a 10 mm fine-tuning range to achieve perfect valve seating without complex linkage changes.
Select the SCJ250X50-10 when you need to dial in a precise mechanical stop for a high-force operation. If 24544 N is excessive, stepping down to the 200 mm bore SCJ200 provides 15708 N of push force at the same pressure. For applications requiring a fixed, non-adjustable stroke, the standard SC series is a more economical choice.
This cylinder is a direct replacement for another AirTAC SCJ250 with a 50 mm nominal stroke and a 10 mm adjustment range, matching PT port threads and basic mounting. For any stroke over 300 mm, always evaluate side-loading on the 50 mm rod; an external guide rail or a switch to a guided cylinder is recommended to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 24544 N. The maximum theoretical push force at 1.0 MPa is 5006 kgf. The pull force is lower at 23562 N at 0.5 MPa due to the 50 mm rod area.
The 10 mm adjustment is a mechanical screw in the rear cap that limits the piston's retraction stroke end. It allows you to shorten the effective stroke from the nominal 50 mm down to 40 mm to fine-tune the stop position, not the force or speed.
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