Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-40S 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 SAIJ125X70-40S
The AirTAC SAIJ125X70-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a carbon steel piston rod and a PT tapered port thread. Because it includes a magnet (-S), it integrates seamlessly with AirTAC CMSE reed and DMSE electronic sensors housed in the dual-side barrel grooves. With a 70 mm nominal stroke and a 40 mm adjustment code, you can dial back the effective travel to establish a precise 30-70 mm usable window during machine commissioning.
Belonging to the 125 mm bore class, this actuator delivers substantial thrust, generating 6136 N of pull force and 8590 N of push force at 0.5 MPa. The rear adjuster functions purely as a mechanical stop to fine-tune the retract end position without adding external stops; it is not a lock and cannot hold a load without live air. For load-holding requirements without continuous air pressure, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-40S |
|---|---|
| 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 SAIJ125X70-40S
| 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 SAIJ125X70-40S Is Used
Product Changeover
Dial in the 30-70 mm travel window during line changeovers to accommodate varying product lengths without swapping the entire actuator.
Heavy Clamping
Leverage the 6136 N pull force at 0.5 MPa for heavy-duty clamping tasks, using the rear stop to set the exact grip position.
Commissioning Calibration
Fine-tune the retract end-of-stroke position during initial machine setup to perfect alignment without relying on external mechanical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-40S the Right Cylinder?
Select this 125 mm bore model when an application demands high force combined with variable end-position tuning. At 0.5 MPa, it provides 6136 N pull force; if your process requires less thrust, stepping down to an 80 mm bore yields 2268 N pull force. Conversely, if you need greater output, moving up to a 160 mm bore offers 9425 N pull. The adjustable stroke is chosen over a fixed SAI cylinder when you need on-the-fly end-stop changes for product size transitions, utilizing the 30-70 mm travel window. The robust 32 mm rod and M27x2 thread handle significant side loads, though any stroke of 300 mm or more would still require an external guide to prevent rod deflection.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 70 mm nominal stroke, 40 mm adjustment range, PT port thread, and -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 attachments, intentionally omitting FB, CA, CB, and CR variants. Operating speed is rated for 30-500 mm/s.
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 SAIJ125X70-40S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of pull force and 8590 N of push force. At 0.7 MPa, the push force increases to 11045 N.
The rear adjuster acts as a mechanical stop that allows you to shorten the nominal 70 mm stroke by up to 40 mm, creating a usable travel window of 30 to 70 mm. It sets the end position but does not lock or hold the load without live air pressure.
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