Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 900mm 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
- Stroke900 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-75
The AirTAC SAIJ40X900-75 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628N of push force and 528N of pull force at 0.5 MPa, utilizing a PT G1/4 port. By turning the external stopper screw, you can trim the effective travel back by up to 75 mm, creating a precise 825-900 mm usable stroke window without swapping out the actuator.
This variant features a SUS304 stainless steel rod for superior corrosion resistance and ships without a magnet. Because the 900 mm stroke is long, the 16 mm rod and M12x1.25 thread still require an external guide to handle side loads. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 900 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 SAIJ40BX900-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×900 | 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 SAIJ40BX900-75 Is Used
Product Changeovers
Dial in the 825-900 mm travel window during format size changes on a packaging line without replacing the actuator.
Adjustable Diverters
Fine-tune the end position of sorting gates on a conveyor to handle varying package lengths on the fly.
Machine Setup
Set precise retract stops during equipment commissioning to avoid recalculating fixed stopper lengths.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-75 the Right Cylinder?
Choose this 40 mm bore when an application requires moderate thrust but highly variable end positions; if you need less force, the 32 mm bore provides 402N at 0.5 MPa, while the 50 mm bore offers 982N for heavier loads. The adjustable stroke is ideal for product changeovers, allowing you to fine-tune the 825-900 mm travel window on the fly instead of machining external stops. For load-holding without continuous air pressure, this cylinder will not suffice—you should look at the SAIL or BSAI series instead.
When specifying an ISO 15552 replacement match, confirm the 40 mm bore, 900 mm stroke, 75 mm adjustment, PT G1/4 port, and SUS304 rod material. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Given the 900 mm length, always support the load with an external linear guide to prevent rod bending.
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 SAIJ40BX900-75 FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
A rear stopper screw lets you shorten the nominal 900 mm stroke by up to 75 mm, providing an adjustable travel window between 825 mm and 900 mm. It functions as a stop, not a lock.
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