Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-50S 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 SAIJ40BX250-50S
The AirTAC SAIJ40X250-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 250 mm nominal travel by up to 50 mm for a precise 200-250 mm usable window. It delivers 879 N of push force at 0.7 MPa and features a SUS304 stainless steel rod for superior corrosion resistance. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
This model includes a magnet (-S) for use with AirTAC CMSE reed and DMSE electronic sensors. The rear adjustment mechanism acts purely as a physical stop for end-position tuning during commissioning or product changeover, and it does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-50S |
|---|---|
| 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 SAIJ40BX250-50S
| 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 SAIJ40BX250-50S Is Used
Machine Changeover
Fine-tune the 200-250 mm travel window during product size changeovers to set new end positions without mechanical rebuilds.
End-Position Tuning
Dial in the exact retract distance during commissioning to compensate for mechanical tolerances in the fixture.
Variable Diverting
Adjust the stroke length on the fly to handle different package sizes moving along a conveyor line.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-50S the Right Cylinder?
Choose this adjustable-stroke variant over a fixed SAI when your setup requires variable end-stops without physically swapping cylinders or adding external stops. If you need less force, stepping down to a 32 mm bore yields 563 N at 0.7 MPa; if your application requires more thrust, a 50 mm bore provides 1374 N. This SAIJ40X250-50-S uses a PT tapered port and supports the reduced SAIJ mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). Because the stroke is 250 mm, ensure adequate external guidance to prevent excessive side-loading on the rod. For load-holding without continuous air pressure, consider an external rod lock or the SAIL/BSAI series.
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 SAIJ40BX250-50S FAQ
At 0.7 MPa operating pressure, this 40 mm bore cylinder generates 879 N of push force and 528 N of pull force. It is rated for a maximum operating pressure of 1.0 MPa.
The rear adjuster acts as a mechanical stop that lets you shorten the 250 mm nominal stroke by up to 50 mm, creating a 200-250 mm usable travel window. It functions as a stop for position tuning, not as a lock to hold the load without air pressure.
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