Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 350mm 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
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-40S
The AirTAC SAIJ125X350-40-S 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 an integrated magnet for position sensing. By turning the rear screw, you achieve a usable travel window of 310-350mm, enabling precise end-position tuning without swapping hardware.
This 125mm bore actuator operates at speeds of 30-500mm/s and uses PT tapered port threads (G1/2). The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. The rear stopper solely dictates the travel end and deceleration point; it does not lock the load, so maintain live air or use a SAIL lock cylinder for holding requirements.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAIJ125AX350-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SAIJ125AX350-40S Is Used
Product Changeovers
Dial in the 310-350mm travel window during format size changes on a packaging line without replacing the entire actuator.
End-Stop Calibration
Fine-tune the retraction point at machine commissioning to achieve exact positioning, utilizing the 40mm rear adjustment screw.
Heavy Forming Operations
Leverage the 6136N push force at 0.5MPa for pressing or holding tasks where the exact end-position varies by jig.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-40S the Right Cylinder?
Choose this adjustable model when your setup requires variable end stops or product-size changeovers, avoiding the need to physically swap out a fixed-stroke SAI cylinder. If your application demands less thrust, stepping down to a 100mm bore yields 3927N push force at 0.5MPa. Because this unit has a 350mm stroke, the 32mm rod diameter provides rigidity, but an external guide is strongly recommended to prevent excessive side-loading on the piston.
For a direct ISO 15552 replacement match, verify the 125mm bore, 350mm stroke, 40mm adjustment range, PT port thread, and the -S magnet option. Mounting choices are restricted to Basic, FA, LB, TC, FTC, TCM1, and TCM2 kits, deliberately omitting FB, CA, CB, and CR brackets.
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 SAIJ125AX350-40S FAQ
The rear adjuster acts as a mechanical stop, allowing you to shorten the effective stroke by up to 40mm. This creates a usable travel window of 310-350mm, allowing you to trim the retraction distance without adding external stops.
At 0.5 MPa operating pressure, it provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
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Standard models usually ship in 3-4 days.
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