Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-10S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 325mm 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
- Stroke325 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-10S
The AirTAC SAIJ125X325-10-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 315 to 325 mm. It delivers 6136 N of pull force at 0.5 MPa and features a PT tapered port thread alongside a robust 32 mm SUS420J2 stainless steel rod. The integrated -S magnet allows precise position detection using AirTAC CMSE reed or DMSE electronic solid-state switches housed in the dual-sided sensor grooves.
Because the nominal 325 mm stroke exceeds the 300 mm threshold, the 32 mm rod diameter should be paired with an external guide to manage side loads and prevent premature wear. The rear adjuster acts purely as a travel stop to fine-tune end positions during commissioning without swapping the cylinder, while the variable air cushions at both ends manage deceleration. It is not a lock; for load-holding without live air, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-10S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 325 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 SAIJ125AX325-10S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×325 | 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 SAIJ125AX325-10S Is Used
Variable End-Stop Positioning
Dial in the exact 315-325 mm travel distance during machine commissioning to accommodate varying product sizes without machining new hard stops.
Product Changeover Systems
Quickly adjust the retract end-position by up to 10 mm on packaging lines when switching between different carton or part dimensions.
Heavy-Duty Ejection
Leverage the 6136 N pull force at 0.5 MPa to reliably eject heavy finished parts, using the rear stopper to fine-tune the ejection reach.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-10S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3681 N pull at 0.5 MPa) lacks the thrust to move your load, but a 160 mm bore (9425 N pull) would be excessive overkill. The adjustable stroke is selected over a fixed SAI cylinder when you need to dial in the exact end-of-stroke position during machine setup or product changeover, saving the cost of external stopper blocks.
When matching this ISO 15552 interchangeable cylinder, verify the 325 mm nominal stroke, 10 mm adjustment range, PT G1/2 ports, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets. Remember that the rear adjuster and air cushion only set the travel end and do not hold the load without continuous air pressure.
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 SAIJ125AX325-10S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of pull force and 8590 N of push force. At 0.7 MPa, the pull force increases to 5734 N and push force to 2182 N.
The rear adjusting screw acts as an external stopper that lets you trim the effective travel back by up to 10 mm from the 325 mm nominal stroke, creating a 315-325 mm usable window. It sets the travel end and deceleration point, but it does not lock or hold the load without live air pressure.
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