Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-75S 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 SAIJ40BX650-75S
The AirTAC SAIJ40X650-75-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that lets you trim the effective travel back by up to 75 mm, creating a 575-650 mm usable window for precise end-position tuning at commissioning. Built with a SUS304 stainless steel rod and a PT tapered port, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa. The integrated magnet supports position sensing using AirTAC CMSE reed and DMSE solid-state switches.
This model uses the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting the FB, CA, CB, and CR brackets found on some standard variants. The rear adjuster acts purely as a travel stop to decelerate the load, meaning it will not hold the load in place without live air pressure. For true load-holding requirements without continuous pressure, consider the SAIL or BSAI locking cylinders.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-75S |
|---|---|
| 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 SAIJ40BX650-75S
| 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 SAIJ40BX650-75S Is Used
Commissioning Fine-Tune
Dial in the exact retract position within the 575-650 mm window during machine setup without machining new hard stops.
Product Changeover
Quickly adapt the stroke end-point on a packaging line when handling different carton sizes, saving changeover time.
Variable End-Stop
Use the rear adjuster as a precise mechanical stop to decelerate the load at the end of travel, ensuring repeatable positioning.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-75S the Right Cylinder?
Choose this 40 mm bore when you need more thrust than a 32 mm bore (which provides 402 N push at 0.5 MPa) but want to avoid the larger footprint of a 50 mm option. The adjustable stroke is ideal for product changeovers on a line, allowing you to fine-tune the retract distance without swapping the cylinder or adding external stops. When replacing an ISO 15552 cylinder, match the 40 mm bore, 650 mm stroke, 75 mm adjustment, PT port, and -S magnet. Because the 650 mm stroke is long and unsupported, an external guide rail is recommended to prevent excessive side-loading on the M12x1.25 rod thread.
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 SAIJ40BX650-75S 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 can deliver up to 128 kgf.
The rear adjuster screw lets you shorten the nominal 650 mm stroke by up to 75 mm, providing an effective travel window of 575 to 650 mm. This allows you to set the exact end-position during commissioning without replacing the cylinder.
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