Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-20 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 SAIJ125AX475-20
The AirTAC SAIJ125X475-20 is a double-acting ISO 15552 profile cylinder featuring a rear mechanical stopper that allows you to fine-tune the travel end during commissioning. With a 475 mm nominal stroke and a 20 mm adjustment range, it provides a usable travel window of 455-475 mm to perfectly dial in end positions without adding external stops. It delivers robust thrust, generating 6136 N of pull force at 0.5 MPa and up to 11045 N at 0.9 MPa.
This unit features a SUS420J2 stainless steel rod (material code A) for improved corrosion resistance compared to standard carbon steel. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to mount position sensors later if needed. The rear adjuster acts purely as a travel stop to set deceleration and end limits, meaning it cannot hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-20 |
|---|---|
| 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 SAIJ125AX475-20
| 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 SAIJ125AX475-20 Is Used
Product Changeovers
Rapidly adjust the 455-475 mm travel window during packaging line size changes without swapping out the entire cylinder.
Machine Setup Tuning
Fine-tune the exact end-of-stroke position at commissioning to perfect a pressing or clamping operation.
Variable End Stops
Dial in the precise retract distance for large automotive or heavy material handling fixtures.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-20 the Right Cylinder?
Selecting this 125 mm bore cylinder is ideal when your application requires high force—such as the 6136 N pull at 0.5 MPa—and variable end-position tuning. If you need less force, stepping down to an 80 mm bore yields 2268 N of pull at 0.5 MPa, while stepping up to a 160 mm bore provides 9425 N. Because the 475 mm stroke is relatively long, the 32 mm rod diameter provides rigidity, but an external guide rail is strongly recommended to prevent excessive side-loading on the piston.
Choose this adjustable-stroke model over a fixed SAI cylinder when you need precise end-position tuning during machine setup or product changeovers. For a drop-in ISO 15552 replacement, match the 125 mm bore, 475 mm stroke, 20 mm adjustment, PT tapered port threads, and your required mounting bracket (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Note that this SKU does not include a magnet (-S), so it will not work with CMSE or DMSE sensors without modification.
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 SAIJ125AX475-20 FAQ
At 0.5 MPa it provides 6136 N of pull force and 8590 N at 0.7 MPa. The maximum push force is 11045 N at 0.9 MPa.
A rear screw stopper lets you shorten the effective stroke by up to 20 mm, creating a 455-475 mm travel window. It acts as a travel stop and does not hold the load without live air.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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