Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-20 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 SAIJ125AX900-20
The AirTAC SAIJ125X900-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a substantial 8590N push force at 0.7 MPa and uses a 32mm SUS420J2 stainless steel rod with an M27x2 thread. The built-in stopper screw allows you to trim the effective travel, creating a precise 880-900mm usable window to dial in the retract end position without swapping hardware.
This 900mm stroke model operates at speeds of 30-500mm/s and includes variable air cushions at both ends to manage kinetic energy. Because the rear adjuster acts only as a travel stop and not a locking device, it cannot hold loads without live air pressure. For position holding, an external pilot-operated check valve or a related SAIL lock cylinder is required.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-20 |
|---|---|
| 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 SAIJ125AX900-20
| 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 SAIJ125AX900-20 Is Used
Machine Setup Calibration
Fine-tune the 880-900mm retract position during initial commissioning to achieve exact alignment without machining external stopper blocks.
Product Changeover
Quickly adjust the end-stop by up to 20mm on a packaging line when switching between different product sizes, minimizing downtime.
Long-Stroke Material Handling
Move heavy loads along a 900mm path using 6136N of push force at 0.5MPa, relying on the adjustable end position for precise placement.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-20 the Right Cylinder?
Selecting this 125mm bore cylinder makes sense when your application requires the 6136N push force available at 0.5MPa, stepping up from a 100mm bore that provides 5497N at the same pressure. The 20mm adjustment range is ideal for fine-tuning the end-of-stroke position during machine commissioning or product changeovers, offering flexibility that a fixed-stroke SAI cylinder cannot match. The PT tapered port thread ensures a tight, reliable pneumatic seal.
When replacing an ISO 15552 cylinder, match the 125mm bore, 900mm stroke, 20mm adjustment, PT port, and mounting choice. Available mounts include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the stroke is 900mm, the long unsupported rod is susceptible to side-loading; always use an external guide to prevent binding and premature seal wear.
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 SAIJ125AX900-20 FAQ
At 0.5MPa it provides 6136N push and 5734N pull force. At 0.7MPa, the push force increases to 8590N, and it reaches a maximum push force of 11045N at 0.9MPa.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective stroke by up to 20mm. This creates an adjustable travel window between 880mm and 900mm, but it does not lock the load without continuous air pressure.
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Standard models usually ship in 3-4 days.
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