Airtac SCJ250 Standard Cylinder SCJ250X150-40S
The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X150-40S 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, 150mm nominal stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Nominal stroke150 mm
- Stroke adjust-40 mm
- Port sizePT1"
- Rod threadM42×2
- CushionAdjustable, 40 mm
About the Airtac SCJ250 Standard Cylinder SCJ250X150-40S
The SCJ250X150-40 is a double-acting, single-rod pneumatic cylinder built on a robust tie-rod design, offering a nominal 150 mm stroke with a 40 mm rear-end adjustment range. This large-bore 250 mm unit delivers substantial force, generating 24544 N of push and 23562 N of pull at 0.5 MPa, and up to 44178 N at the maximum operating pressure of 0.9 MPa. The 50 mm diameter piston rod and 1-inch PT ports ensure high flow for responsive cycling.
A built-in magnet (S-suffix) is integrated into the piston, allowing direct mounting of CMSG, DMSG, or EMSG sensors on the barrel for precise, non-contact end-of-stroke sensing. The body length is 409 mm, and the adjustable screw lets you fine-tune the stroke end position in the field without swapping the cylinder, making it ideal for commissioning heavy-duty machinery or adjusting for tooling wear in large-scale material handling.
Airtac SCJ250 Standard Cylinder SCJ250X150-40S Technical Specifications
| Model | Airtac SCJ250 Standard Cylinder SCJ250X150-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 150 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.
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 SCJ250X150-40S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 250 | Bore size in mm. |
| ×150 | 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.
Where the Airtac SCJ250 Standard Cylinder SCJ250X150-40S Is Used
Heavy Press Commissioning
The 40 mm adjustment range allows process engineers to dial in the exact pressing depth on large forming or stamping presses during initial setup, without needing to fabricate custom-length hard stops.
Mining Conveyor Diverter
Used on a bulk material diverter gate, the adjustable stroke compensates for seal wear over time, maintaining a perfect seal against the chute wall and preventing material leakage in harsh environments.
Steel Mill Roll Gap Control
In a rolling mill, this cylinder positions a guide roll. Operators can fine-tune the roll gap via the rear screw to accommodate different material thicknesses, a critical adjustment made quickly during product changeovers.
Is the Airtac SCJ250 Standard Cylinder SCJ250X150-40S the Right Cylinder?
Choose the SCJ250 for applications demanding the highest force in the SCJ family. If your load requires less force, stepping down to the 200 mm bore reduces push force to 15708 N at 0.5 MPa, offering a more compact and energy-efficient solution. For a fixed, non-adjustable stroke, the standard SC series is a direct alternative. This model is a direct replacement for any AirTAC SCJ250 cylinder with a 150 mm nominal stroke and a 40 mm adjustment range, provided the port thread (PT) and magnet option match. For strokes of 300 mm or more, always consider external guides or a guided cylinder to protect the 50 mm rod from side-load bending.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ250X150-40S FAQ
At the standard 0.5 MPa operating pressure, the push force is 24544 N and the pull force is 23562 N. The maximum push force at 0.9 MPa is 44178 N. Remember that as a single-rod cylinder, the push force is always greater than the pull force due to the rod area on the piston.
Yes, if you need field adjustability. The SCJ250X150-40 is a direct dimensional replacement for an AirTAC SC250X150, but with the added benefit of a 40 mm stroke-end adjustment. Ensure your mounting (basic in this case), port thread (PT), and sensor requirement (magnet-equipped) match your existing setup.
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