Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-100S 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 SAIJ125X425-100S
The AirTAC SAIJ125X425-100-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and features a built-in magnet for position sensing. The 100mm adjustment screw allows you to dial back the 425mm nominal stroke, creating a precise 325-425mm usable travel window without changing the cylinder body.
This model uses a carbon steel piston rod with an M27x2 thread and PT tapered ports. It carries the standard SAIJ mounting set, including Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, while omitting FB, CA, CB, and CR brackets. The extruded aluminum barrel includes sensor grooves on both sides, fully compatible with CMSE reed and DMSE electronic switches for flexible mounting.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-100S |
|---|---|
| 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 SAIJ125X425-100S
| 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 SAIJ125X425-100S Is Used
Machine Changeover
Dial in the 325-425mm travel window during product size changes without physically swapping cylinders or adding external stopper blocks.
Heavy Pressing
Leverage the 6136N push force at 0.5 MPa for heavy-duty pressing operations, using the rear screw to fine-tune the exact bottoming position.
Variable End-Stop Forming
Set precise material forming depths on the fly, using the 100mm adjuster to compensate for material thickness variations across production runs.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-100S the Right Cylinder?
Choose this 125mm bore when you need substantial thrust—such as 6136N push at 0.5 MPa—and a flexible end-stop. If your application requires less force, stepping down to an 80mm bore yields 2513N push at 0.5 MPa. The 100mm adjustment range is ideal for product changeovers, letting you fine-tune the retract position on the fly rather than swapping a fixed-stroke SAI cylinder.
Because the 425mm stroke creates a long unsupported rod length, adding an external guide is recommended to handle side loads and prevent rod bending. Remember that the rear adjuster is a travel stop, not a locking mechanism; this SAIJ will not hold its load without live air pressure. For load-holding requirements, consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder instead.
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 SAIJ125X425-100S FAQ
At an operating pressure of 0.5 MPa, this 125mm bore cylinder provides 6136N of push thrust and 5734N of pull thrust. It can reach up to 1251 kgf at 1.0 MPa.
The rear adjuster screw acts as a mechanical stop that can shorten the 425mm nominal stroke by up to 100mm, giving you a usable travel window of 325-425mm. It is a travel stop, not a lock, and requires live air to maintain position.
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