Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 650mm 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
- Stroke650 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-20
The AirTAC SAIJ40X650-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 630 to 650 mm, allowing you to dial back the nominal 650 mm stroke by up to 20 mm during commissioning. This 40 mm bore generates 628 N of push force and 528 N of pull force at 0.5 MPa operating pressure.
Equipped with a SUS304 stainless steel rod and PT tapered port threads, this variant is built for corrosive environments. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU ships without a magnet. The rear adjuster acts purely as a mechanical stop to fine-tune the end position and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 650 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 SAIJ40BX650-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×650 | 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 SAIJ40BX650-20 Is Used
Machine Changeover
Quickly fine-tune the end-of-stroke position within the 630-650 mm window when switching product sizes on a packaging line, eliminating the need to swap cylinders.
Material Handling
Provides 628 N of push force at 0.5 MPa to divert or push items on a conveyor, with the rear stopper allowing precise positioning adjustments during setup.
Corrosive Environments
The SUS304 stainless steel rod material withstands moisture and harsh washdowns, making it suitable for food processing or chemical handling equipment.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-20 the Right Cylinder?
Choose this 40 mm bore cylinder when your application requires 628 N of push force at 0.5 MPa. If your process demands less force, stepping down to a 32 mm bore yields 402 N; conversely, stepping up to a 50 mm bore provides 982 N. The adjustable-stroke design is ideal for product changeovers or fine-tuning end positions without adding external stops, unlike a fixed-stroke SAI cylinder. For load-holding without continuous air pressure, consider an AirTAC SAIL or BSAI cylinder instead, as the SAIJ adjuster is not a locking mechanism.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 650 mm stroke, 20 mm adjustment range, PT G1/4 port, and standard mounting interface. Because the 650 mm stroke is relatively long, an external guide is recommended to prevent excessive side-loading on the piston rod. This model supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ40BX650-20 FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, it delivers 1130 N of push force.
The rear adjuster acts as a mechanical stop that lets you shorten the effective stroke from 650 mm down to 630 mm. This allows precise end-position tuning during commissioning without replacing the cylinder, though it does not lock the load without live air pressure.
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