Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-50 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 SAIJ40BX900-50
The AirTAC SAIJ40X900-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates an 850-900 mm usable travel window. It delivers 879 N of push force at 0.7 MPa and uses a PT tapered port thread. The piston rod is constructed from SUS304 stainless steel, offering superior corrosion resistance for harsh or washdown environments.
Because the 900 mm stroke length is substantial for a 40 mm bore, the 16 mm rod diameter should be supported by an external guide to prevent sagging and excessive side-loading. The rear adjuster functions strictly as a mechanical stop to dial in the retract position during commissioning; it does not lock the load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series instead.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-50 |
|---|---|
| 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 SAIJ40BX900-50
| 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 SAIJ40BX900-50 Is Used
Variable End-Stop Tuning
Dial in the exact retract position within the 850-900 mm window during machine commissioning without installing bulky external stopper blocks.
Product Changeover
Quickly adapt the stroke length on a packaging line to accommodate different carton sizes by turning the rear adjustment screw.
Long-Stroke Handling
Utilize the 900 mm travel for automated material transfer tasks, ensuring precise end-positioning with the built-in air cushion.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-50 the Right Cylinder?
Choose this 40 mm bore model over the neighboring 32 mm bore when you need more than the 563 N push force (at 0.7 MPa) of the smaller variant, but do not require the 1374 N output of the 50 mm bore. The 50 mm adjustment range is ideal for machinery that requires variable end-stops or frequent product-size changeovers, eliminating the need to physically swap out a fixed-stroke SAI cylinder.
When integrating this ISO 15552 dimensionally interchangeable cylinder, note the available mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2. Since no magnet is specified, position sensing requires adding an external sensor track or upgrading to an -S model to use CMSE reed or DMSE electronic switches in the dual-side sensor grooves.
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 SAIJ40BX900-50 FAQ
At 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. The standard operating speed ranges from 30 to 800 mm/s.
The rear adjuster acts as a mechanical stopper, allowing you to shorten the effective travel from 900 mm down to 850 mm. It is used for fine-tuning end positions at commissioning but does not hold the load without live air pressure.
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