Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-75
The AirTAC SAIJ125X550-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136N of push force at 0.5MPa and provides a usable travel window of 475 to 550mm, letting you dial back the nominal 550mm stroke by up to 75mm during commissioning.
This 125mm bore unit uses a PT tapered port and a 32mm carbon steel rod with an M27x2 thread. The extruded aluminum barrel includes sensor grooves on both sides, and the rear adjuster acts purely as a mechanical stop to fine-tune the end position without holding the load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 550 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 SAIJ125X550-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×550 | 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 SAIJ125X550-75 Is Used
Variable End-Stop Forming
Dial in the exact 475 to 550mm retraction point for heavy stamping or forming tools without machining new hard stops.
Product Size Changeover
Quickly adjust the 75mm travel window on packaging lines when switching between different large-format product sizes.
Machine Setup Tuning
Fine-tune the end-of-stroke position during initial commissioning to prevent crashes and optimize heavy-load transfer.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-75 the Right Cylinder?
Choose this 125mm bore when you need heavy thrust but require end-position flexibility for product changeovers; step down to an 80mm bore if your application only requires 2513N at 0.5MPa. The adjustable stroke is ideal for dialing in exact travel limits on the fly, whereas a fixed SAI cylinder locks you into a single dimension.
Because the 550mm stroke is long, the 32mm rod still needs an external guide to prevent excessive side-loading. Remember that the rear adjuster is a travel stop, not a lock; to hold a load without live air pressure, use an external rod lock or pilot-operated check valve. This model is dimensionally interchangeable per ISO 15552 and supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ125X550-75 FAQ
At 0.5MPa, it provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear adjuster screw lets you mechanically shorten the effective stroke from 550mm down to 475mm. It functions as a travel stop and does not lock the load without continuous air pressure.
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