Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 250mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke250 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-30
The AirTAC SAIJ40X250-30 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 220-250 mm usable travel window, allowing you to dial back the 250 mm nominal stroke by up to 30 mm during commissioning. Delivering 628 N of pull force at 0.5 MPa, it bridges the gap between compact 32 mm bores and heavier 50 mm units.
This variant uses a SUS304 stainless steel piston rod for corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for standard switches. The rear adjuster acts solely as a mechanical stop to fine-tune the end position, meaning it will not hold a load without continuous live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-30 Is Used
Machine Changeover
Dial in the exact 220 to 250 mm end-stop during product size transitions without replacing the cylinder or adding external shims.
Assembly Positioning
Fine-tune the retract stroke on an assembly fixture to account for material thickness variations, using the 628 N pull force to move parts.
Conveyor Diverter
Adjust the travel window on a sorting diverter arm by up to 30 mm during line setup, relying on the SUS304 rod for washdown durability.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-30 the Right Cylinder?
Choose this 40 mm bore when you need precise end-position tuning without swapping cylinders or adding external stops on a machine changeover. If your application requires less force, stepping down to a 32 mm bore yields 345 N of pull at 0.5 MPa; stepping up to a 50 mm bore provides 825 N. For load-holding without live pressure, this cylinder is not a lock—consider an external rod lock or the related SAIL or BSAI series.
To match this ISO 15552 interchangeable cylinder, specify a 40 mm bore, 250 mm stroke, 30 mm adjustment range, PT ports, and the SUS304 (B) rod material. It supports the SAIJ mounting subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the 250 mm stroke is within standard limits but approaches a length where leverage increases, ensure external guides support any lateral loads.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-30 FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
A rear screw stopper lets you mechanically shorten the 250 mm nominal stroke by up to 30 mm, creating a 220-250 mm travel window. It acts as a travel stop and does not lock the load without live air.
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