Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-100 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 900mm 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
- Stroke900 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-100
The AirTAC SAIJ125X900-100 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 900 mm stroke that can be dialed back by up to 100 mm, creating an 800-900 mm usable travel window for precise end-position tuning. Delivering 6136 N of push force at 0.5 MPa, this bore size is built for heavy-duty positioning.
The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE or DMSE switches. The carbon steel rod and M27x2 thread provide robust load handling, while the PT tapered port ensures a reliable pneumatic seal. The rear adjuster acts strictly as a travel stop for commissioning changes, not as a lock, meaning live air is required to hold the load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-100 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 900 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 SAIJ125X900-100
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×900 | 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 SAIJ125X900-100 Is Used
Large Part Machining Changeover
Dial the stroke back by up to 100 mm to accommodate different raw casting lengths on a machining fixture without repositioning the cylinder body.
Adjustable Transfer Stop
Set variable end-stops on a heavy-duty transfer line to index pallets of varying widths, fine-tuning the stopping position during commissioning.
Heavy Press Positioning
Tune the retraction end-point on a large press to ensure precise tooling clearance, using the rear stopper to set the exact 800-900 mm travel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-100 the Right Cylinder?
Choose this 125 mm bore when 982 N of push force at 0.5 MPa from a 50 mm bore is insufficient, but you want to avoid stepping up to the 160 mm size and its 10053 N output. The 100 mm adjustment range is selected when a machine requires significant product-size changeover capacity, allowing you to shorten the stroke dynamically without swapping out the entire cylinder or adding external stops.
For any stroke of 900 mm, the extended length demands an external guide to prevent rod bending and premature seal wear. To replace this ISO 15552 cylinder, match the 125 mm bore, 900 mm stroke, 100 mm adjustment, PT G1/2 port, and standard carbon steel rod. Note that the SAIJ mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2. If the application requires holding the load without live air pressure, use an external rod lock or pilot-operated check valve, or select the SAIL or BSAI series instead.
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 SAIJ125X900-100 FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. The maximum operating pressure is 1.0 MPa, and the speed range is 30-500 mm/s.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel from the 900 mm nominal stroke down to as little as 800 mm. This allows precise end-position tuning during setup without changing the cylinder, but it is a stop, not a lock, and will not hold the load without live air pressure.
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