Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-75S 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 SAIJ125X475-75S
The AirTAC SAIJ125X475-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and features a 475mm nominal stroke that can be fine-tuned down by up to 75mm, creating a precise 400-475mm usable travel window. This built-in adjustability allows operators to set exact retract end-positions during commissioning without adding external stops.
This -S variant includes a magnet for position sensing and uses a standard carbon steel rod with a PT tapered port thread. The extruded aluminum barrel incorporates sensor grooves on both sides for flexible mounting of AirTAC CMSE reed or DMSE electronic switches. Because the rear adjuster acts strictly as a travel stop and not a locking device, live air is required to maintain the load position.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-75S |
|---|---|
| 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 SAIJ125X475-75S
| 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 SAIJ125X475-75S Is Used
Product Changeover
Dial in the 400-475mm retract window on packaging lines to accommodate different carton depths without swapping hardware.
Machine Setup
Fine-tune the end-of-stroke position during initial commissioning to perfect pressing distances on heavy assembly tooling.
Variable End Stops
Adjust the rear stopper screw to alter the resting position of large actuators in automated material handling cells.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-75S the Right Cylinder?
Select this 125mm bore cylinder when an application requires heavy thrust (6136N push at 0.5 MPa) alongside variable end-stop positioning. If you need less force, stepping down to a 100mm bore yields 3927N push force, while moving up to a 160mm bore provides 10053N. The adjustable stroke is chosen over a fixed SAI model when product changeovers demand a re-tuned retract distance rather than a physical cylinder swap. To replace an existing ISO 15552 unit, match the 125mm bore, 475mm stroke, 75mm adjustment range, PT port thread, and -S magnet.
With a 475mm stroke, the M27x2 rod and piston assembly will experience amplified leverage on the bearing if subjected to lateral forces. An external guide rail should be installed to absorb any side loads and prevent premature wear. For applications requiring the load to be held without continuous air pressure, a standard SAIJ will not suffice; consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder instead.
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 SAIJ125X475-75S FAQ
It features a rear mechanical stopper screw that lets you shorten the effective stroke by up to 75mm. This turns the 475mm nominal stroke into a 400-475mm adjustable travel window, allowing precise end-position tuning without changing the cylinder.
At 0.5 MPa operating pressure, it provides 6136N of push force and 5734N of pull force. At its maximum 1.0 MPa pressure, the push force reaches 1251 kgf.
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Standard models usually ship in 3-4 days.
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