Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 85mm 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
- Stroke85 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-30
The AirTAC SAIJ125X85-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the end position. With a nominal stroke of 85 mm and a 30 mm adjustment code, it provides a usable travel window of 55 to 85 mm. This bore delivers 6136 N of push force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
It features a SUS420J2 stainless steel rod for enhanced corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU omits the magnet. The rear adjuster acts purely as a travel stop to set deceleration, not as a lock, so live air is required to hold the load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 85 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 SAIJ125AX85-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×85 | 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 SAIJ125AX85-30 Is Used
Heavy Press Fit
Delivers 6136 N of push force at 0.5 MPa for seating heavy components, with the 30 mm adjuster allowing precise bottoming-out depth control.
Product Changeover
Dial in the stroke from 55 to 85 mm during format size changes on a packaging line, avoiding the need to physically swap out cylinders.
Assembly Station
Provides robust clamping for industrial assembly, using the rear stopper to set the exact retraction point without adding external mechanical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-30 the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder (providing 2513 N push at 0.5 MPa) lacks the necessary thrust, but a 160 mm bore is physically too large. The adjustable 55-85 mm travel window is ideal for machine setups requiring precise end-position tuning without fabricating external stopper blocks. For load-holding without continuous air pressure, an external rod lock or a SAIL cylinder is necessary, as the SAIJ adjuster cannot hold the load.
When replacing an ISO 15552 cylinder, verify the 125 mm bore, 85 mm nominal stroke, 30 mm adjustment range, PT port threads, and the absence of a magnet. The supported mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR options. Because the 85 mm stroke is relatively short, side-load stress is minimal compared to longer strokes.
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 SAIJ125AX85-30 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw lets you mechanically shorten the effective stroke by up to 30 mm. This creates a usable travel window of 55 to 85 mm, allowing you to fine-tune the end position during commissioning without swapping the cylinder.
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