Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 500mm 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
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-40
The AirTAC SAIJ125X500-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 500mm nominal stroke that can be fine-tuned backward by up to 40mm, creating a precise 460-500mm usable travel window for product changeovers. Operating at 0.5 MPa, it delivers 6136N of push force and 5734N of pull force.
This large-bore unit utilizes a robust 32mm piston rod and a PT G1/2 port. The rod is constructed from SUS420J2 stainless steel (code A) for superior corrosion resistance. The extruded aluminum barrel includes sensor grooves on both sides for flexible CMSE reed or DMSE electronic switch mounting, while the rear adjuster acts purely as a travel stop and does not hold the load without live air.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAIJ125AX500-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SAIJ125AX500-40 Is Used
Heavy Product Changeover
Dial in the 460-500mm travel window during line changeovers to accommodate different large product sizes without physically swapping the actuator.
Machine Setup Tuning
Fine-tune the exact end-of-stroke position during commissioning using the rear screw, eliminating the need to bolt on external physical stops.
Variable End Stops
Adjust the retract position on the fly for automated processes that require flexible end-stop locations within a 40mm adjustment band.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-40 the Right Cylinder?
Selecting this 125mm bore cylinder makes sense when your application requires the 6136N thrust at 0.5 MPa (or 8590N at 0.7 MPa) but demands on-the-fly end-position tuning. If your setup only needs 4523N of push force at 0.5 MPa, stepping down to an 80mm bore saves space; however, the SAIJ125X500-40 is unmatched for heavy product-size changes that need a 460-500mm variable end-stop without swapping cylinders.
Because the stroke is 500mm, an external guide is strongly recommended to prevent side-load damage to the rod and seals. The rear adjuster is a stop, not a lock; for load-holding without live air pressure, consider the AirTAC SAIL or BSAI series. To match this ISO 15552 interchangeable cylinder, specify: 125mm bore, 500mm stroke, 40mm adjustment, PT G1/2 port, Basic/FA/LB/TC/FTC/TCM1/TCM2 mounting, and no 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 SAIJ125AX500-40 FAQ
At an operating pressure of 0.5 MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw allows you to shorten the effective travel from the 500mm nominal stroke by up to 40mm, providing a 460-500mm usable window. It acts only as a travel stop and does not lock the load without continuous air pressure.
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