Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-50
The AirTAC SAIJ125 Adjustable Cylinder SAIJ125X475-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 475mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it interchangeable with other ISO 15552 cylinders at the mounting interface.
- BoreØ125 mm
- Stroke475 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-50
The AirTAC SAIJ125X475-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 475 mm travel that can be dialed back by up to 50 mm, creating a 425-475 mm usable end-position window for precise mechanical tuning during commissioning.
This extruded aluminum body omits tie-rod construction and includes sensor grooves on both sides for direct mounting of CMSE reed or DMSE electronic switches. The rear adjuster acts purely as a travel stop to fine-tune deceleration without adding external stops, but it does not hold the load without live air pressure. For position-holding requirements, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 475 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 | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | — |
| Max (@1.0 MPa) | 1169 kgf | |
Double-rod model: the rod passes through the rear cover, so both piston faces lose rod area and push is shown at the annular-area value. Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×475 | 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 SAIJ125X475-50 Is Used
Product Changeover Stops
Dial in the 425-475 mm travel window on packaging lines to instantly accommodate different carton lengths without swapping hardware.
Heavy Press Tuning
Fine-tune the end-of-stroke position on a 6136 N press operation during setup, ensuring exact material contact without external shims.
Machine Commissioning
Adjust the retract stopper on-site to synchronize multi-stage machinery, compensating for mechanical tolerances during initial build.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-50 the Right Cylinder?
Select this 125 mm bore when a 100 mm cylinder (providing 3927 N at 0.5 MPa) lacks the thrust for heavy pushing, but a 160 mm bore (10053 N) would be physically oversized. The 50 mm adjustment range is ideal for product changeovers on a line, allowing you to shift the end-stop without physically swapping the cylinder or bolting on external stopper blocks. To match this ISO 15552 replacement exactly, verify the 475 mm stroke, 50 mm adjuster, PT G1/2 port, and your required mounting style from the SAIJ set (Basic, FA, LB, TC, FTC, TCM1, TCM2).
Because the 475 mm stroke is substantial, the extended 32 mm rod will experience amplified leverage on any lateral load. An external guide rail is strongly recommended to prevent side-load damage and premature seal wear.
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 SAIJ125X475-50 FAQ
The rear adjuster screw lets you shorten the 475 mm nominal stroke by up to 50 mm, giving a usable travel window of 425-475 mm. It functions as a mechanical stop to fine-tune the end position and must not be used as a load-holding lock.
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