Airtac SAIJ125 Adjustable Cylinder SAIJ125BX475-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX475-40 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 a drop-in replacement for other ISO 15552 cylinders in automation lines.
- 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 SAIJ125BX475-40
The AirTAC SAIJ125X475-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 435 to 475 mm usable travel window. Delivering 6136 N of push force at 0.5 MPa, it handles heavy-duty positioning while allowing precise end-stop tuning during commissioning without swapping out the entire actuator.
This variant utilizes a SUS304 stainless steel rod for superior corrosion resistance and features PT tapered ports. Because the 475 mm stroke is substantial, the 32 mm rod diameter and M27x2 thread provide necessary rigidity, though an external guide is recommended to manage side loads over this long travel distance.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX475-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX475-40 |
|---|---|
| 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 | 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 SAIJ125BX475-40
| 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 SAIJ125BX475-40 Is Used
Product Size Changeovers
Dial in the 435-475 mm travel window during format changeovers on packaging lines, accommodating varying carton lengths without adding external mechanical stops.
Heavy-Duty Press Fitment
Leverage the 6136 N push force to seat heavy components, using the rear screw to fine-tune the exact bottoming position during initial machine commissioning.
Long-Stroke Material Handling
Move substantial payloads across a 475 mm span, relying on the robust 32 mm SUS304 rod and adjustable end-stop to dial in the precise transfer location.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX475-40 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (providing 3927 N push at 0.5 MPa) lacks the thrust for your tooling, but a 160 mm bore is physically oversized. The 40 mm adjustment range is selected when you need variable end-stops for frequent product-size changeovers on a line, rather than relying on a fixed-stroke SAI cylinder. When matching an ISO 15552 replacement, verify the 475 mm stroke, 40 mm adjuster, PT port thread, and mounting style (Basic, FA, LB, TC, FTC, TCM1, or TCM2).
For strokes of 475 mm, external load guiding is critical to prevent rod binding. Remember that the rear adjuster acts only as a travel stop to set deceleration alongside the air cushions; it does not hold the load without live air. For true load-holding without pneumatic pressure, consider an AirTAC SAIL or BSAI cylinder.
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 SAIJ125BX475-40 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.9 MPa.
The rear adjuster screw allows you to shorten the nominal 475 mm stroke by up to 40 mm, providing an effective travel range of 435 to 475 mm. This stopper fine-tunes the end position but does not lock the load without continuous air pressure.
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