Airtac SCJ250 Standard Cylinder SCJ250X1000-20S
The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X1000-20S 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, 1000mm nominal stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Nominal stroke1000 mm
- Stroke adjust-20 mm
- Port sizePT1"
- Rod threadM42×2
- CushionAdjustable, 40 mm
About the Airtac SCJ250 Standard Cylinder SCJ250X1000-20S
The SCJ250X1000-20 is a heavy-duty double-acting single-rod cylinder with a rear-cap adjusting screw, providing a 20 mm field-adjustable stroke-end range for fine-tuning on large-scale equipment. With a 250 mm bore and a 50 mm diameter rod, it delivers a substantial 24544 N of push force at 0.5 MPa, making it suitable for demanding clamping, pressing, and positioning tasks.
This ISO 6430 class tie-rod cylinder uses a 1-inch PT port and features a 40 mm air cushion for effective end-of-stroke deceleration. The body length A is 409 mm, and the adjustable screw allows operators to dial in the exact stroke end without swapping the cylinder, which is invaluable during commissioning or format changes on heavy machinery.
Airtac SCJ250 Standard Cylinder SCJ250X1000-20S Technical Specifications
| Model | Airtac SCJ250 Standard Cylinder SCJ250X1000-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 1000 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.
Theoretical Output Force (Ø250mm)
| 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.
Model Code: Airtac SCJ250 Standard Cylinder SCJ250X1000-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 250 | Bore size in mm. |
| ×1000 | 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.
Where the Airtac SCJ250 Standard Cylinder SCJ250X1000-20S Is Used
Heavy Press Commissioning
The 20 mm adjustable stroke allows engineers to precisely set the final pressing depth on a large forming press during initial setup, accommodating tooling variations without replacing the cylinder.
Material Handling End-Stop
In a lumber or steel sheet handling system, the screw adjustment compensates for wear on the end-stop bumper, maintaining a consistent final position for the 1000 mm stroke pusher.
Large Clamp Stroke Tuning
For a heavy-duty welding fixture, the adjustable stroke end allows fine-tuning of the clamp's closed position to accommodate different workpiece thicknesses within the 20 mm range.
Is the Airtac SCJ250 Standard Cylinder SCJ250X1000-20S the Right Cylinder?
Select the SCJ250X1000-20 when you need a powerful, field-tunable stroke end on a large-bore cylinder. If 24544 N of push force at 0.5 MPa is more than required, stepping down to the 200 mm bore reduces push force to 15708 N. For a fixed-stroke alternative without the adjustment mechanism, the standard SC series is the correct choice. This model includes a built-in magnet (S) for direct mounting of CMSG/DMSG/EMSG sensors. For this 1000 mm stroke, ensure the rod is adequately supported against side loads; an external guide system is recommended to prevent bending and premature seal wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ250 Standard Cylinder SCJ250X1000-20S FAQ
The theoretical push force at the maximum operating pressure of 1.0 MPa is 44178 N. At a common working pressure of 0.5 MPa, the push force is 24544 N. The pull force is slightly lower at 23562 N due to the area taken up by the 50 mm rod.
The -20 suffix indicates a rear-cap adjusting screw that can shorten the stroke end by up to 20 mm. This allows you to field-adjust the effective stroke from 980 mm to the nominal 1000 mm maximum. It sets the stopping position and does not alter the cylinder's force or speed.
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