Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 850mm 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
- Stroke850 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-30
The AirTAC SAIJ125X850-30 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N push force at 0.5 MPa. It features a SUS420J2 stainless steel rod and PT tapered port threads. The external stopper provides a usable travel window of 820 to 850 mm, letting you dial back the nominal 850 mm stroke by up to 30 mm during commissioning without swapping the cylinder.
This adjustable-stroke design uses a reduced mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2. The rear adjuster acts purely as a travel stop for end-position tuning and does not hold the load without live air; for position holding, consider a SAIL or BSAI variant. Operating speed is 30-500 mm/s, and the extruded aluminum barrel includes sensor grooves on both sides.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 850 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 SAIJ125AX850-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×850 | 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 SAIJ125AX850-30 Is Used
Machine Changeovers
Dial in the 820-850 mm retract position during product family transitions without physically replacing the cylinder or adding external stop blocks.
Heavy Material Handling
Leverage the 6136N push force at 0.5 MPa to shift heavy pallets or workpieces while fine-tuning the exact end-stop location.
Assembly Line Calibration
Achieve precise end-position tuning during initial commissioning, using the 30 mm adjustment window to perfect the stroke without mechanical modifications.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-30 the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial thrust (6136N at 0.5 MPa) alongside precise end-position tuning. If you need less force, stepping down to an 80 mm bore yields 2513N, but the SAIJ125X850-30 ensures the rigidity needed for heavy loads. Choose this adjustable version over a fixed SAI when you anticipate product changeovers or need to fine-tune the retract distance on the fly.
When ordering, verify the 850 mm stroke, 30 mm adjustment, PT port threads, and SUS420J2 rod material. Because the stroke is 850 mm, an external guide is strongly recommended to prevent excessive side-loading on the rod. Note that the rear adjuster only sets the travel end and is not a lock; load-holding without live pressure requires an external rod lock or a SAIL cylinder.
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 SAIJ125AX850-30 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw acts as an external stop that trims the effective travel back from the 850 mm nominal stroke, creating a usable 820-850 mm window. It allows fine-tuning of the end position without swapping cylinders, but it functions only as a stop and does not lock the load.
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