Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-40S 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 SAIJ40BX125-40S
The AirTAC SAIJ40X125-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 628N push force at 0.5MPa and features a 16mm carbon steel core, though here configured with a SUS304 stainless steel rod for superior corrosion resistance. The rear stopper allows you to trim the nominal 125mm stroke back by up to 40mm, creating an 85-125mm usable travel window for precise end-position tuning.
This adjustable-stroke design eliminates the need to swap cylinders or add external stops during product changeover. It includes a magnet for position sensing with AirTAC CMSE reed and DMSE electronic switches. The extruded aluminum barrel carries sensor grooves on both sides, and the mounting set covers Basic, FA, LB, TC, FTC, TCM1, and TCM2 options.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-40S |
|---|---|
| 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 SAIJ40BX125-40S
| 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 SAIJ40BX125-40S Is Used
Variable End-Stop Setup
Dial in the exact 85 to 125mm travel distance during machine commissioning without physically swapping out the entire cylinder body.
Product Size Changeover
Quickly adapt the stroke length on packaging lines when handling different box dimensions, using the 40mm rear adjustment range.
Sensor-Ready Positioning
Leverage the integrated magnet and dual-side sensor grooves to mount CMSE or DMSE switches for precise end-of-stroke detection.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-40S the Right Cylinder?
Choose this 40mm bore when 32mm (402N push at 0.5MPa) is too weak, but 50mm (982N) would be overkill. The 85-125mm adjustable travel window is ideal for machines requiring variable end-stops. Remember the rear adjuster acts only as a travel stop and does not hold the load without live air; for fail-safe load holding, consider the SAIL or BSAI series. For ISO 15552 replacement, match the 125mm stroke, 40mm bore, PT tapered port, -S magnet, and 40mm adjustment.
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 SAIJ40BX125-40S FAQ
At 0.5MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. It can reach up to 1130N push force at 0.9MPa.
The rear adjuster screw lets you shorten the 125mm nominal stroke by up to 40mm, providing an 85-125mm usable travel window. It acts as a mechanical stop to decelerate the piston, but it does not lock or hold the load without continuous air pressure.
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