Airtac SCJ250 Standard Cylinder SCJ250X1000-50
The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X1000-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø250mm bore, 1000mm nominal stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Nominal stroke1000 mm
- Stroke adjust-50 mm
- Port sizePT1"
- Rod threadM42×2
- CushionAdjustable, 40 mm
About the Airtac SCJ250 Standard Cylinder SCJ250X1000-50
The SCJ250X1000-50 is an ISO 6430 class double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. Its 250 mm bore generates a substantial 24544 N of push force at 0.5 MPa, rising to 44178 N at the maximum operating pressure of 0.9 MPa, making it suitable for heavy pressing, clamping, and material handling tasks. A rear-cap adjusting screw provides up to 50 mm of stroke-length reduction, allowing fine-tuning of the end position without removing the cylinder from the machine.
This model features a 50 mm diameter piston rod with an M42x2 male thread and a G1 inch port for air supply. The cylinder body has an overall length A(SCJ) of 409 mm plus the 1000 mm nominal stroke, and includes an adjustable air cushion of 40 mm to decelerate the piston smoothly at the end of travel. It operates on filtered air from 0.15 to 1.0 MPa across a standard temperature range of -20 to +70 °C.
Airtac SCJ250 Standard Cylinder SCJ250X1000-50 Technical Specifications
| Model | Airtac SCJ250 Standard Cylinder SCJ250X1000-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 1000 mm |
| Stroke adjustment | Up to 50 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 SCJ250X1000-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 250 | Bore size in mm. |
| ×1000 | Nominal (maximum) stroke length in mm. |
| -50 | 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 SCJ250X1000-50 Is Used
Commissioning & Setup
Fine-tune the end stop of a heavy-duty press or forming machine during initial setup by adjusting the rear screw, eliminating the need for external hard stops or shims.
Wear Compensation
On a large material handling gate or diverter, the 50 mm adjustment range can be used to compensate for mechanical wear on the gate seal or linkage over time, maintaining a perfect seal.
Format Changeovers
Quickly adapt the stroke of a clamping fixture for different product sizes on a production line, reducing changeover time between batches without swapping the cylinder.
Is the Airtac SCJ250 Standard Cylinder SCJ250X1000-50 the Right Cylinder?
Select the SCJ250X1000-50 when you need high force and the ability to dial in the stroke end position during commissioning or changeovers. If your force requirement is lower, stepping down to a 200 mm bore reduces push force to 15708 N at 0.5 MPa, saving energy and space. For applications where the stroke length is fixed and never needs adjustment, the standard SC250X1000 fixed-stroke cylinder is a simpler, more cost-effective alternative.
For this 1000 mm stroke, managing side loads and preventing rod buckling is critical. Always ensure the load is guided externally or use a guided cylinder if significant lateral forces are present. A direct replacement must match the 250 mm bore, 1000 mm nominal stroke, 50 mm adjustment range, PT port thread, and basic mounting configuration exactly.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-50)
- ✓ 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 SCJ250X1000-50 FAQ
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 44178 N. The pull force is lower because the rod reduces the effective piston area on the return stroke.
The rear-cap adjusting screw limits the piston's outward stroke end by up to 50 mm. It is a mechanical stop for stroke length, not a locking device. The cylinder will not hold a load if air pressure is lost; an external rod lock or pilot-operated check valve is required for position holding.
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