Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-100
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-100 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 SAIJ40BX125-100
The AirTAC SAIJ40X125-100 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 125 mm travel by up to 100 mm. This creates a highly flexible 25-125 mm usable stroke window, perfect for adapting end positions during product changeovers without swapping hardware. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
This specific SKU features a SUS304 stainless steel rod for superior corrosion resistance and ships with PT tapered ports. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE reed or DMSE electronic switches if a magnet is added later. Mounting options are limited to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-100 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-100 |
|---|---|
| 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 SAIJ40BX125-100
| 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 SAIJ40BX125-100 Is Used
Product Changeovers
Quickly alter the retract distance by up to 100 mm when running different sized components on the same line, minimizing downtime between batches.
End-Stop Calibration
Dial in the exact 25 to 125 mm end position during machine commissioning to perfect seating forces without physically remounting the actuator.
Variable Depth Operations
Ideal for pressing or inserting tasks where the required depth varies, letting the rear stopper absorb the difference rather than the tooling.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-100 the Right Cylinder?
Select this 40 mm bore when an application requires precise positioning within a 25-125 mm travel band, stepping down from a 50 mm bore (which yields 982 N push at 0.5 MPa) to save space, or up from a 32 mm bore (402 N push). The massive 100 mm adjustment range allows operators to fine-tune the retract end-stop at commissioning rather than machining external stops. Because the rear screw acts only as a travel stop and the air cushions handle deceleration, this cylinder cannot hold loads without live air; for true load-holding, consider an AirTAC SAIL or BSAI model.
For an exact ISO 15552 replacement, match the 40 mm bore, 125 mm stroke, 100 mm adjustment code, PT port thread, and desired mounting bracket. Since this SKU lacks a magnet (-S), position sensing requires adding one or using external proximity targets. The 16 mm rod and M12x1.25 thread handle moderate side loads, but for any stroke approaching 300 mm or beyond, an external guide rail is recommended to prevent rod binding.
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 SAIJ40BX125-100 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 up to 128 kgf.
The rear adjuster screw acts as a mechanical stop, allowing you to trim the effective stroke back from the 125 mm nominal length down to as little as 25 mm. This stopper sets the travel end point but does not lock the load without continuous air pressure.
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