Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-30 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 SAIJ125X850-30
The AirTAC SAIJ125X850-30 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering robust performance for heavy-duty automation. It features a 125 mm bore and an 850 mm stroke that can be fine-tuned down by up to 30 mm, creating an exact 820-850 mm usable travel window during commissioning. Operating at 0.5 MPa, it provides 6136 N of pull force, while the carbon steel rod and M27x2 thread ensure high mechanical strength for demanding industrial environments.
This model uses a PT tapered port and omits the FB, CA, CB, and CR mounting options, offering a focused set of attachments (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the 850 mm stroke is relatively long, an external guide is recommended to prevent excessive side-loading on the rod. The rear adjuster functions strictly as a travel stop to dial in the end position, not as a lock, meaning live air pressure is required to hold the load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-30 |
|---|---|
| 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 SAIJ125X850-30
| 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 SAIJ125X850-30 Is Used
Variable End Stops
Dial in the 820-850 mm travel window during machine commissioning to accommodate different material thicknesses without adding external stopper blocks.
Product Size Changeover
Quickly adjust the retract position on automated assembly lines when switching between product runs, saving downtime on physical cylinder swaps.
Heavy-Duty Positioning
Leverage the 6136 N pull force to shift heavy jigs or fixtures into their final retracted position with fine-tuning capability at the rear stopper.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-30 the Right Cylinder?
Choose this 125 mm bore cylinder when your application requires substantial force—such as the 6136 N pull at 0.5 MPa—and a long stroke with the flexibility to trim the end position by up to 30 mm without swapping out the barrel. If your setup needs less push force, stepping down to a 100 mm bore yields 3927 N at 0.5 MPa, whereas moving up to a 160 mm bore provides 9425 N of pull. The adjustable rear stopper is ideal for product changeovers on a line, allowing operators to set variable end stops quickly.
When specifying a replacement, match the 125 mm bore, 850 mm stroke, 30 mm adjustment range, PT port thread, and the required mounting style. Since this is a non-magnet version, position sensing requires adding a magnet (-S) to work with CMSE reed or DMSE electronic switches. For applications that must hold a load securely without continuous air pressure, consider the SAIL (air-released lock) or BSAI (clamp-lock) series instead, as the SAIJ adjuster alone cannot hold a load.
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 SAIJ125X850-30 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of pull force and 8590 N of push force. At the maximum operating pressure of 1.0 MPa, it can deliver up to 1251 kgf.
The rear adjusting screw acts as a mechanical stopper that allows you to shorten the effective stroke by up to 30 mm, providing a usable travel window of 820 to 850 mm. It is a travel stop for fine-tuning end positions, not a lock, and requires live air pressure to hold a load.
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