Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-10S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-10S
The AirTAC SAIJ125X425-10-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 425 mm travel by up to 10 mm for a precise 415-425 mm usable window. It delivers a robust 6136 N pull force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks.
This variant features a standard carbon steel piston rod and includes a magnet for use with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel incorporates sensor grooves on both sides, and the rear adjuster functions purely as a travel stop to fine-tune end positions without adding external stops.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-10S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 425 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 SAIJ125X425-10S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×425 | 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 SAIJ125X425-10S Is Used
Machine Setup Changeover
Fine-tune the 415-425 mm rear end stop during product size transitions on a packaging line without swapping out the entire cylinder assembly.
Heavy Material Handling
Leverage the 6136 N pull force to push or position heavy pallets, dialing in the exact 10 mm travel margin to prevent mechanical crashes.
Variable End-Stop Positioning
Adjust the retract distance on the fly for automated conveyor diverters, ensuring precise alignment for varying package lengths.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-10S the Right Cylinder?
Choose this adjustable-stroke model over a fixed SAI when your application requires precise end-position tuning during commissioning or product changeover. If your process demands less force, stepping down to a 100 mm bore yields a 3681 N pull at 0.5 MPa, whereas moving up to a 160 mm bore provides a 9425 N pull.
Because the 425 mm stroke is relatively long, the 32 mm diameter rod and M27x2 thread carry significant side-load capacity, but an external guide is still recommended for unsupported loads. Remember that the rear adjuster and air cushions only decelerate the travel end; they do not hold the load without live air. For true load-holding, consider an external rod lock or AirTAC SAIL/BSAI models. This cylinder uses a PT tapered port and supports the SAIJ mounting set: Basic, FA, LB, TC, FTC, TCM1, TCM2.
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 SAIJ125X425-10S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of pull force and 8590 N of push force at 0.7 MPa.
The rear adjuster acts as an external stop that lets you shorten the 425 mm nominal stroke by up to 10 mm, creating a 415-425 mm usable travel window for precise end-position tuning during commissioning.
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