Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-10S 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 SAIJ125AX425-10S
The AirTAC SAIJ125X425-10-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. Its 425mm nominal stroke can be fine-tuned backward by up to 10mm, creating a 415-425mm usable travel window for precise end-position calibration during machine commissioning. This eliminates the need to swap out the physical cylinder when dialing in a new product size.
Featuring a SUS420J2 stainless steel rod (material code A) and PT tapered port threads, this model includes a magnet for position sensing. It supports AirTAC CMSE reed and DMSE solid-state switches housed within the dual-side sensor grooves on its extruded aluminum barrel. The mounting set covers Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options found on other variants.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-10S |
|---|---|
| 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 SAIJ125AX425-10S
| 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 SAIJ125AX425-10S Is Used
Machine Setup & Commissioning
Dial in the exact 415-425mm retract position during initial machine build without machining new hard stops or swapping cylinders.
Product Size Changeover
Quickly adapt the end-of-stroke position on a packaging line when introducing a slightly shorter product variant.
Assembly Press Fine-Tuning
Adjust the pressing depth precisely on-site to ensure consistent assembly force without reprogramming the motion controller.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-10S the Right Cylinder?
Choose this 125mm bore when the 80mm class (providing 2513N push at 0.5 MPa) is insufficient, but the 160mm bore (10053N at 0.5 MPa) would be excessive. The 10mm adjustment range is ideal for applications requiring micro-trimming of the retract end rather than broad travel changes. Because the stroke is 425mm, the 32mm rod diameter should still be paired with an external guide to prevent excessive side loading on the barrel.
Remember that the rear adjuster acts solely as a mechanical stop and does not hold the load without live air pressure; for fail-safe load holding, consider the SAIL or BSAI series. To match this ISO 15552 replacement exactly, specify a 125mm bore, 425mm stroke, 10mm adjustment, PT ports, A rod material, and the -S magnet.
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 SAIJ125AX425-10S FAQ
At 0.5 MPa it provides 6136N push and 5734N pull force, scaling up to 11045N push at 0.9 MPa. The operational speed range for this 125mm bore is 30-500 mm/s.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective travel from 425mm down to 415mm. It sets the end position but does not lock the load without continuous air pressure.
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