Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 40mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke40 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-40
The AirTAC SAIJ125X40-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a SUS420J2 stainless steel rod (code A) and PT tapered ports. The integrated rear stopper allows you to trim the nominal 40mm stroke back by up to 40mm, creating a highly flexible 0-40mm usable travel window for precise end-position tuning.
This adjustable design eliminates the need to swap cylinders or bolt on external stops during product changeovers. The extruded aluminum barrel includes sensor grooves on both sides, and while this unit lacks a magnet, the profile supports CMSE reed and DMSE electronic switches when needed. The rear adjuster acts strictly as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 40 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×40 | 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 SAIJ125 Adjustable Cylinder SAIJ125AX40-40 Is Used
Product Changeovers
Dial in the exact retract distance for varying product sizes on a packaging line using the 0-40mm adjustment window without changing hardware.
Machine Setup
Fine-tune the end-position during initial commissioning to achieve perfect alignment, leveraging the 6136N thrust for heavy forming tasks.
Variable End Stops
Create adjustable mechanical limits for automated clamping stations, relying on the rear stopper to set the precise 0-40mm travel distance.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-40 the Right Cylinder?
Choose this 125mm bore cylinder when an application demands high thrust (6136N push at 0.5 MPa) alongside highly variable end-stops. If you need less force, stepping down to the 100mm bore yields 3927N push force. The SAIJ125X40-40 is selected specifically for its 0-40mm adjustable travel window, allowing operators to fine-tune retract positions at commissioning without changing the cylinder. For applications requiring the load to be held without continuous air pressure, this cylinder is insufficient as the adjuster is only a stop; consider an AirTAC SAIL or BSAI locking cylinder instead.
When replacing an ISO 15552 cylinder, match the 125mm bore, 40mm nominal stroke, 40mm adjustment range, PT port thread, and your required mounting set. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, explicitly omitting FB, CA, CB, and CR options. The 32mm rod and M27x2 thread provide robust resistance to side loads, though external guides should still be evaluated for heavy radial loads.
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 SAIJ125 Adjustable Cylinder SAIJ125AX40-40 FAQ
At a 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster acts as a mechanical stop that lets you trim the nominal 40mm stroke back by up to 40mm, resulting in a 0-40mm usable travel window. It only sets the travel end and does not lock or hold the load without live air pressure.
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