Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 125mm 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
- Stroke125 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-75
The AirTAC SAIJ40X125-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 628N of push force at 0.5 MPa and provides a usable travel window of 50 to 125 mm, letting you dial in the exact retract position without swapping hardware. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
This specific configuration uses a SUS304 stainless steel rod for superior corrosion resistance and utilizes PT tapered port threads with a G1/4 connection. The rear stopper acts as a travel limit to fine-tune deceleration, but it does not hold the load pneumatically. For position holding without live air pressure, an external rod lock or a SAIL cylinder is required.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 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 SAIJ40BX125-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 SAIJ40BX125-75 Is Used
Machine Changeover
Rapidly adjust the retract stop from 50 to 125mm when switching between product sizes on a packaging line, avoiding mechanical rebuilds.
Commissioning Calibration
Fine-tune the final end position during setup to perfectly seat components, using the rear screw rather than adding external stopper blocks.
Corrosive Environments
Leverage the SUS304 stainless steel rod for light-duty pushing tasks in washdown or chemical-adjacent areas requiring precise variable stops.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-75 the Right Cylinder?
Choose this 40mm bore when an application requires precise end-position tuning during commissioning or product changeovers, stepping up from a 32mm bore that yields only 402N at 0.5 MPa. The generous 75mm adjustment range on a 125mm stroke is perfect for prototyping or variable product lines, replacing the need for multiple fixed-stroke SAI cylinders. When specifying a replacement, verify the 125mm stroke, 75mm adjustment, PT port thread, and standard mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the stroke exceeds 300mm on larger variants, always ensure adequate external guiding, though this 125mm unit handles its travel robustly. Note that since no magnet is specified, it will not work with CMSE or DMSE sensors without adding the -S option.
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 SAIJ40BX125-75 FAQ
The rear adjuster allows you to shorten the effective stroke by up to 75mm, creating a usable travel window of 50 to 125mm. It acts as a mechanical stop to tune the end position, but it is not a lock and will not hold the load without continuous air pressure.
At 0.5 MPa, it provides 628N of push force and 528N of pull force. If higher force is needed, stepping up to a 50mm bore increases the push force to 982N at the same pressure.
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