Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 70mm 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
- Stroke70 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-40S
The AirTAC SAIJ125X70-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering robust performance with a 6136N pull force at 0.5 MPa. It features a SUS420J2 stainless steel rod and a built-in magnet for position sensing. By turning the external rear screw, you can shorten the effective travel, creating a usable stroke window of 30-70mm for precise end-position tuning during commissioning.
This adjustable design eliminates the need to swap cylinders or bolt on external stops when product sizes change on a line. The rear adjuster acts purely as a mechanical travel stop to set the end position and works alongside the variable air cushions at both ends. It does not hold the load without live air pressure; for true load-holding, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 70 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 SAIJ125AX70-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×70 | 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 SAIJ125AX70-40S Is Used
Product Size Changeovers
Dial in the 30-70mm travel window on the fly to accommodate varying package lengths on a single packaging line without changing the cylinder.
Commissioning End-Stop Tuning
Fine-tune the retract end position during machine setup to perfect the pressing or clamping distance without adding external stopper blocks.
Variable Stroke Positioning
Use the rear adjuster to safely vary the extended reach on automated assembly stations, relying on the stop to set the exact 30-70mm travel limit.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-40S the Right Cylinder?
Choose this 125mm bore cylinder when your application requires high force (6136N pull at 0.5 MPa) alongside frequent stroke adjustments. If you need less force, stepping down to an 80mm bore yields 2268N pull, whereas fixed-stroke applications without changeover needs are better served by the standard SAI series. This SAIJ model includes PT tapered ports and a -S magnet compatible with CMSE reed and DMSE solid-state sensors.
For any replacement, verify the 125mm bore, 70mm nominal stroke, 40mm adjustment range, PT port thread, and mounting style. SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Because the stroke is under 300mm, side-load concerns are minimal, but an external guide is still recommended for heavy lateral 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 SAIJ125AX70-40S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of pull force and 8590N of push force. It reaches a maximum of 11045N push force at 0.9 MPa.
The rear adjuster screw allows you to trim the 70mm nominal stroke back by up to 40mm, creating a usable travel window of 30-70mm. This stopper sets the end position but does not lock the load without continuous air pressure.
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