Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 375mm 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
- Stroke375 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-40
The AirTAC SAIJ125X375-40 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa and features a 375mm nominal stroke that can be fine-tuned down by up to 40mm, creating a precise 335-375mm usable travel window. This built-in adjustability allows you to dial in the retract end-position during commissioning without swapping hardware or adding external stops.
Constructed with an extruded aluminum barrel and a standard carbon steel piston rod, this large-bore pneumatic actuator operates at speeds of 30-500mm/s. It utilizes PT tapered port threads (G1/2) and includes variable air cushions at both ends to decelerate heavy loads smoothly. The rear adjuster acts strictly as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 375 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 SAIJ125X375-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×375 | 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 SAIJ125X375-40 Is Used
Product Size Changeovers
Dial in the 335-375mm travel window via the rear screw to accommodate varying package lengths on a packaging line without changing the cylinder.
Machine Setup Tuning
Fine-tune the retract end-stop during initial commissioning to achieve exact positioning of heavy 125mm bore tooling without adding external shims.
Heavy Forming End-Stop
Leverage the 6136N push force for high-load pressing operations while using the 40mm adjustment to set the precise bottoming depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-40 the Right Cylinder?
Select this 125mm bore actuator when an application demands high thrust—such as 6136N push at 0.5 MPa—that smaller bores cannot provide, and when the exact end-of-stroke position needs on-the-fly tuning. If your setup requires less force, stepping down to a 100mm bore yields 3927N push force. Choose the SAIJ adjustable-stroke design over a fixed SAI cylinder when you anticipate product changeovers or need to micro-adjust the retract position during machine setup.
Because this model features a 375mm stroke, the M27x2 piston rod will experience leverage forces under load; an external guide mechanism is recommended to prevent excessive side-loading and premature seal wear. For load-holding without continuous live air pressure, note that this cylinder's adjuster is only a stop—you would need an external rod lock or a related type like the SAIL or BSAI clamp-lock cylinder. Replacement mounting must use the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, or TCM2.
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 SAIJ125X375-40 FAQ
At 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 screw allows you to shorten the effective stroke by up to 40mm from the 375mm nominal length, providing a usable travel window of 335-375mm. It functions as a mechanical stop for end-position tuning and is not a locking device.
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