Airtac SCJ250 Standard Cylinder SCJ250X150-50
The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X150-50 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, 150mm nominal stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Nominal stroke150 mm
- Stroke adjust-50 mm
- Port sizePT1"
- Rod threadM42×2
- CushionAdjustable, 40 mm
About the Airtac SCJ250 Standard Cylinder SCJ250X150-50
The SCJ250X150-50 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, built on a robust tie-rod construction. Its 50 mm rear-cap screw lets you fine-tune the retract end position without removing the cylinder, delivering a push force of 24544 N at 0.5 MPa and a maximum theoretical force of 5006 kgf at 1.0 MPa.
This ISO 6430 class big-bore unit uses a 50 mm diameter rod and a 1-inch PT port, with a 40 mm air cushion to decelerate the massive piston assembly. The body length A(SCJ) is 409 mm, and the adjustable stroke range is ideal for commissioning large-scale machinery where the exact end-stop must be dialled in under load.
Airtac SCJ250 Standard Cylinder SCJ250X150-50 Technical Specifications
| Model | Airtac SCJ250 Standard Cylinder SCJ250X150-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 150 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 SCJ250X150-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 250 | Bore size in mm. |
| ×150 | 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 SCJ250X150-50 Is Used
Heavy Press Commissioning
Dial in the precise retract stop on a 250-bore cylinder during initial setup of a large forming or stamping press, accommodating tooling tolerances without re-machining mounts.
Steel Mill Roller Gap Adjustment
Fine-tune the gap between rollers in a heavy-gauge material handling line. The 50 mm screw allows operators to quickly compensate for roller wear or change material thickness.
Large Valve Actuator Calibration
Set the exact stroke end for a high-torque butterfly or gate valve actuator. The adjustable stop ensures full-open and full-closed positions are perfectly aligned with the valve body seats.
Is the Airtac SCJ250 Standard Cylinder SCJ250X150-50 the Right Cylinder?
Choose the SCJ250 when your application demands thrust in the 24.5 kN class at standard plant air. If your force requirement is closer to 15.7 kN, stepping down to the SCJ200 (15708 N push at 0.5 MPa) reduces air consumption and physical size. For applications that do not require stroke-end adjustment, the fixed-stroke SC250 is a simpler, more cost-effective alternative. A direct replacement must match the 250 mm bore, 150 mm nominal stroke, 50 mm adjust range, PT port thread, and basic mounting. At this 150 mm stroke, rod bending is not a primary concern, but always ensure the load is guided externally if significant side forces are present.
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 SCJ250X150-50 FAQ
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N (due to the 50 mm rod area). At the maximum operating pressure of 0.9 MPa, the push force reaches 44178 N. The theoretical maximum at 1.0 MPa is 5006 kgf of push force.
The rear-cap adjusting screw sets the physical end-of-stroke position for the piston's retract direction, allowing you to shorten the nominal 150 mm stroke by up to 50 mm. It is a mechanical stop for tuning, not a locking device. The cylinder will not hold a mid-stroke position if air pressure is lost; an external rod lock or pilot-operated check valve is required for load holding.
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