Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 700mm 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
- Stroke700 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-40S
The AirTAC SAIJ125X700-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 660 to 700 mm. It delivers 6136 N of push force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks. The barrel features sensor grooves on both sides, and this -S variant includes a magnet for direct compatibility with CMSE reed and DMSE electronic solid-state switches.
This model uses a SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance and features PT tapered port threads. The rear stopper mechanism allows you to fine-tune the retract end position during commissioning or product changeovers without swapping the cylinder. It supports a reduced set of ISO 15552 mountings: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 700 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 SAIJ125AX700-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×700 | 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 SAIJ125AX700-40S Is Used
Variable End Stops
Dial in the exact retract distance within the 660-700 mm window during machine setup, avoiding the need to fabricate external stopper blocks.
Product Changeover
Quickly adjust the stroke by up to 40 mm on a packaging line when transitioning to a different pallet or product size.
Heavy Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy fixtures while fine-tuning the final resting position at commissioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-40S the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial force, stepping up from the 80 mm bore which provides 2513 N at 0.5 MPa. The adjustable stroke is chosen over a fixed SAI model when exact end-positioning must be dialed in on the machine rather than relying on rigid mechanical stops. Because the nominal stroke is 700 mm, an external guide is recommended to prevent excessive side-loading on the 32 mm rod.
For an exact ISO 15552 replacement match, verify a 125 mm bore, 700 mm stroke, 40 mm adjustment range, PT port threads, and the -S magnet option. Note that the rear adjuster functions strictly as a travel stop and does not hold the load without live air pressure; for true load-holding, consider an AirTAC SAIL or BSAI cylinder.
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 SAIJ125AX700-40S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster acts as a mechanical stop that allows you to shorten the effective stroke by up to 40 mm, creating a usable travel window of 660 to 700 mm. It only sets the travel end and does not lock the load without live air.
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