Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-40 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
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-40
The AirTAC SAIJ125X475-40 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 475 mm stroke that can be fine-tuned down by up to 40 mm, yielding a usable travel window of 435-475 mm. Operating at 0.5 MPa, it delivers 6136 N of push force and 5734 N of pull force, making it ideal for heavy-duty positioning tasks.
This variant features a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and uses PT tapered port threads (G1/2). The extruded aluminum barrel includes sensor grooves on both sides. Note that the rear adjuster acts strictly as a travel stop to decelerate the load, not as a locking device; the cylinder cannot hold position without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-40 |
|---|---|
| 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 SAIJ125AX475-40
| 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 SAIJ125AX475-40 Is Used
Machine Changeover
Dial in the 435-475 mm travel window during product size transitions without swapping out the entire cylinder or adding external stopper blocks.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move substantial loads, using the rear adjuster to perfectly set the retracted end position.
End-Position Tuning
Fine-tune the retract stroke by up to 40 mm during commissioning to absorb mechanical tolerances and ensure precise machinery alignment.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-40 the Right Cylinder?
Choose this adjustable-stroke model over a fixed SAI cylinder when your application requires variable end-stops or precise end-position tuning during machine commissioning and product changeover. To match your ISO 15552 replacement, verify the 125 mm bore, 475 mm stroke, 40 mm adjustment range, PT G1/2 port, and standard mounting options. Since no magnet is specified, position sensing is not enabled.
For applications needing less force, stepping down to a 100 mm bore yields 3927 N of push force at 0.5 MPa. Given the 475 mm stroke, the 32 mm rod diameter provides rigidity, but an external guide rail is highly recommended to prevent excessive side-loading on the long, unsupported piston rod. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR brackets.
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 SAIJ125AX475-40 FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster screw allows you to shorten the effective stroke by up to 40 mm from the nominal 475 mm, creating a 435-475 mm travel window. This mechanism acts as a stop to set the end position and does not lock or hold the load without continuous air pressure.
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