Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-30 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 SAIJ125AX900-30
The AirTAC SAIJ125X900-30 is a double-acting ISO 15552 profile cylinder featuring a rear mechanical stopper that allows you to fine-tune the effective stroke. With a 900 mm nominal stroke and a 30 mm adjustment range, you get a usable travel window of 870 to 900 mm. This bore delivers 6136 N of push force at 0.5 MPa, making it suited for heavy-duty positioning. The extruded aluminum barrel includes sensor grooves on both sides, though this specific configuration omits the magnet, so position sensing via CMSE reed or DMSE electronic switches requires adding an -S version.
This unit utilizes a SUS420J2 stainless steel rod for enhanced corrosion resistance compared to standard carbon steel. The rod diameter is 32 mm with an M27x2 thread, paired with PT (tapered) port threading for the G1/2 air supply. The rear adjuster acts purely as a travel stop to dial in the exact end position during commissioning; it is not a locking device. For applications requiring the load to be held without live air pressure, an external pilot-operated check valve or a related AirTAC series like SAIL or BSAI is necessary.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-30 |
|---|---|
| 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 SAIJ125AX900-30
| 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 SAIJ125AX900-30 Is Used
Heavy Fixture Positioning
Dial in the exact 870-900 mm travel end-point for large machining fixtures during setup, allowing micro-adjustments without swapping out the entire cylinder body.
Product Changeover Stops
Adjust the rear stopper on the fly to handle different product lengths on a heavy-duty transfer line, shifting the stroke limit by up to 30 mm as needed.
Long-Stroke Assembly Press
Utilize the 6136 N thrust at 0.5 MPa to drive large components over a 900 mm distance, fine-tuning the final contact position via the rear screw.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-30 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (providing 3927 N push at 0.5 MPa) lacks the thrust for your heavy fixtures, but a 160 mm bore (10053 N at 0.5 MPa) would be physically oversized. The 30 mm adjustable stroke is selected over a fixed-stroke SAI cylinder when you need variable end-stops to accommodate product changeovers or to perfect final positioning without adding external stopper blocks to your machine frame. When replacing an ISO 15552 cylinder, match the 125 mm bore, 900 mm stroke, 30 mm adjustment, PT G1/2 port, and your required mounting accessory.
Because this cylinder features a 900 mm stroke, the long unsupported piston rod is susceptible to side loads and sagging. An external guide rail must be used to support the load and prevent binding, as the 32 mm rod alone cannot absorb severe lateral forces. Mounting options are limited to the reduced SAIJ set: Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR brackets found on some standard profiles.
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 SAIJ125AX900-30 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. If higher pressure is available, it can deliver up to 8590 N push at 0.7 MPa.
The rear adjuster acts as a mechanical stopper that lets you shorten the 900 mm nominal stroke by up to 30 mm, providing an effective travel window of 870 to 900 mm. It only sets the end position and does not lock or hold the load without live air pressure.
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