Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-10
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-10 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 SAIJ125AX425-10
The AirTAC SAIJ125X425-10 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 415-425mm usable travel window. It delivers 8590N of push force at 0.7MPa, making it suitable for heavy-duty positioning tasks. The extruded aluminum barrel includes sensor grooves on both sides, and this specific configuration utilizes a SUS420J2 stainless steel rod for enhanced corrosion resistance.
Equipped with PT tapered ports and a 32mm rod, this model omits the FB, CA, CB, and CR mounting styles found on some variants, supporting only Basic, FA, LB, TC, FTC, TCM1, and TCM2 interfaces. The rear stopper allows precise end-position tuning during commissioning without adding external stops, though it acts purely as a travel limit and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-10 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-10 |
|---|---|
| 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 SAIJ125AX425-10
| 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 SAIJ125AX425-10 Is Used
Heavy Machinery Setup
Dial in the exact 415-425mm retract position during heavy machinery commissioning without swapping out the entire cylinder.
Product Line Changeover
Quickly adjust the end-stop by up to 10mm to accommodate new product sizes on a high-force assembly line.
Long-Stroke Positioning
Utilize the robust 32mm SUS420J2 rod for pushing heavy loads over a 425mm travel distance with precise end limits.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-10 the Right Cylinder?
Select this 125mm bore cylinder when an application requires substantial thrust, stepping up from a 100mm bore that provides 5497N push force at 0.7MPa. The 10mm adjustment range is ideal for fine-tuning the retract end position during machine setup or product changeovers, providing flexibility that a fixed-stroke SAI cylinder cannot offer. Because the nominal stroke is 425mm, an external guide should be used to support the load and prevent excessive side loading on the rod.
To match this cylinder for an ISO 15552 replacement, verify the 125mm bore, 425mm stroke, 10mm adjustment, PT port thread, and the required mounting style. Note that a plain SAIJ does not hold position without continuous air pressure; for load-holding requirements, consider an AirTAC SAIL or BSAI variant 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 SAIJ125AX425-10 FAQ
At 0.7 MPa operating pressure, this 125mm bore cylinder provides 8590N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9 MPa.
The rear adjuster acts as a mechanical stop that allows you to shorten the effective stroke by up to 10mm, creating a 415-425mm travel window. It only sets the end position and does not lock or hold the load without live air pressure.
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