Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 350mm 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
- Stroke350 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-20S
The AirTAC SAIJ40X350-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel window from 330 to 350 mm without external stops. It provides 628 N of push force and 528 N of pull force at a 0.5 MPa operating pressure. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting.
This variant uses a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet for CMSE reed and DMSE electronic sensors. It connects via PT G1/4 tapered ports and relies on adjustable air cushions at both ends to decelerate the load. Remember that the rear adjuster is a travel stop, not a lock; it will not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 350 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 SAIJ40BX350-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×350 | 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 SAIJ40BX350-20S Is Used
Machine Changeover
Dial in the 330-350 mm end-stop during product size changes without physically swapping the cylinder or adding external shims.
Variable End Diverter
Precisely set the diverter arm reach on a packaging line, adjusting the travel within the 20 mm window for different carton widths.
Press Stroke Tuning
Fine-tune the final pressing position of a light-duty assembly press, ensuring accurate contact without over-traveling.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-20S the Right Cylinder?
Choose this 40 mm bore when 32 mm is too weak (offering only 402 N push at 0.5 MPa) but 50 mm is excessive. The 20 mm adjustment range is ideal for product changeovers, letting you dial in the exact end position during commissioning rather than machining custom spacers or swapping a fixed-stroke SAI cylinder. Because the 350 mm stroke is long, an external guide rail is recommended to prevent rod side-load damage.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 350 mm nominal stroke, 20 mm adjuster, PT G1/4 port, and SUS304 rod. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2. For applications requiring the load to stay put without continuous air, select a SAIL or BSAI series cylinder instead.
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 SAIJ40BX350-20S FAQ
At 0.5 MPa it provides 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa operating pressure, it delivers up to 128 kgf.
The rear adjuster screw acts as a mechanical stop, letting you shorten the effective travel from 350 mm down to 330 mm. It only sets the end position and does not lock the load without live air.
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