Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-20S 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 SAIJ125X375-20S
The AirTAC SAIJ125X375-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 355 to 375 mm. Fitted with a PT tapered port and an integrated magnet for position sensing, it delivers 6136 N of pull force at 0.5 MPa and safely handles speeds up to 30-500 mm/s.
Because the rear screw acts purely as a mechanical stop to fine-tune the retract end position, it does not hold the load without live air pressure. For load-holding without continuous air, consider the SAIL or BSAI variants. This SAIJ model uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-20S |
|---|---|
| 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 SAIJ125X375-20S
| 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 SAIJ125X375-20S Is Used
Product Changeover
Dial in the exact 355-375 mm end position during line changeovers for different product sizes without bolting on external stops or replacing the cylinder.
End-Position Tuning
Fine-tune the retract stroke during machine commissioning to perfect the seating of heavy 125 mm bore tooling without mechanical rework.
Adjustable Stops
Accommodate varying package dimensions on a conveyor by adjusting the travel window in seconds, leveraging the 6136 N pull force to shift heavy loads.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-20S the Right Cylinder?
Choose this 125 mm bore over the smaller 100 mm version (which provides 3681 N pull at 0.5 MPa) when your application demands higher clamping forces, or step up to the 160 mm bore for 9425 N pull if structural limits allow. The 20 mm adjustment range is ideal for product changeovers on a production line, allowing you to dial in the exact end-stop without swapping the cylinder or adding external stops.
With a 375 mm stroke, the 32 mm diameter carbon steel rod and M27x2 thread provide substantial rigidity, but an external guide is still recommended to manage side loads on long travels. To replace an ISO 15552 cylinder, match the 125 mm bore, 375 mm stroke, 20 mm adjustment, PT port, and -S magnet. The integrated magnet works seamlessly with AirTAC CMSE reed and DMSE electronic sensors.
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 SAIJ125X375-20S FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of pull force and 8590 N of push force. It can deliver a maximum push force of 11045 N at 0.9 MPa.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 375 mm nominal stroke by up to 20 mm, creating a 355-375 mm usable travel window. It sets the end position but does not lock or hold the load without live air pressure.
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Standard models usually ship in 3-4 days.
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