Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 450mm 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
- Stroke450 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-20S
The AirTAC SAIJ40X450-20-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 450 mm travel that can be fine-tuned down by up to 20 mm, giving an exact usable window of 430-450 mm for precise end-position calibration. Built with a SUS304 stainless steel rod and a PT tapered port, it delivers 879 N of push force at 0.7 MPa.
This adjustable-stroke design eliminates the need to swap cylinders or add external stops during machine commissioning or product changeover. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE reed and DMSE electronic switches, while the generous 450 mm stroke makes an external guide advisable to manage side loads.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 450 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 SAIJ40BX450-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×450 | 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 SAIJ40BX450-20S Is Used
Machine Commissioning
Dial in the exact end-of-stroke position within the 430-450 mm window during setup without machining external stop blocks.
Product Changeover
Quickly adjust the retract distance on a packaging line when switching to a different product size.
Variable End-Stop
Fine-tune the travel limit on automated assembly equipment to accommodate varying component dimensions.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-20S the Right Cylinder?
Choose this 40 mm bore cylinder when an application requires 879 N of push force at 0.7 MPa, stepping up from a 32 mm bore (563 N) for heavier demands or down from a 63 mm bore (2182 N) to save space. The 20 mm rear adjustment screw allows variable end-stops without replacing the cylinder, unlike a fixed-stroke SAI model. For a true ISO 15552 replacement, match the 40 mm bore, 450 mm stroke, 20 mm adjustment, PT port, and -S magnet.
Because the stroke is 450 mm, an external guide is recommended to support the rod and prevent excessive side-loading. Remember that the rear adjuster functions strictly as a travel stop and deceleration point, not a lock; the SAIJ does not hold loads without live air pressure, so consider a SAIL or BSAI cylinder for true load-holding requirements.
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 SAIJ40BX450-20S FAQ
At 0.7 MPa, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
The rear adjuster screw allows you to shorten the effective stroke by up to 20 mm from the 450 mm nominal length, providing a usable travel window of 430-450 mm. The adjuster acts as a mechanical stop and does not lock the load without live air.
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