Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 135mm 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
- Stroke135 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-75S
The AirTAC SAIJ125X135-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a usable travel window of 60 to 135 mm, allowing you to dial back the nominal 135 mm stroke by up to 75 mm during commissioning. This bore delivers 6136 N of pull force at 0.5 MPa and accepts PT tapered port threads.
Featuring a SUS420J2 stainless steel rod (material code A) and an integrated magnet (-S), this cylinder is fully compatible with AirTAC CMSE reed and DMSE electronic solid-state sensors housed in the dual-side extruded barrel grooves. The rear adjuster acts purely as a mechanical stop to fine-tune the end position without swapping components.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 135 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 SAIJ125AX135-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×135 | 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 SAIJ125AX135-75S Is Used
Variable End-Stop Tuning
Dial in the exact 60 to 135 mm travel window during machine commissioning to accommodate multiple product sizes without physically swapping cylinders.
Heavy-Duty Changeover
Leverage the 6136 N pull force at 0.5 MPa for positioning heavy fixtures, using the 75 mm rear adjuster to quickly reset end positions for new production runs.
Sensor-Ready Positioning
Utilize the integrated magnet with DMSE electronic sensors to track the piston across the adjusted travel range for high-precision actuation feedback.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-75S the Right Cylinder?
Choose this 125 mm bore when your application requires substantial thrust, such as 6136 N pull or 8590 N push at 0.7 MPa. If your force requirements are lower, stepping down to the 100 mm bore yields 3681 N pull at 0.5 MPa, whereas moving up to the 160 mm bore provides 9425 N pull. The adjustable stroke is highly beneficial for product changeovers, letting you set variable end-stops on the fly instead of installing a fixed SAI cylinder.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 135 mm stroke, 75 mm adjustment range, PT port thread, and the -S magnet requirement. Because the nominal stroke is 135 mm, standard external guiding is not heavily stressed, but always ensure the load is guided to prevent rod side-loading. Remember that the rear adjuster is a travel stop, not a lock; for load-holding without live air, select an 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 SAIJ125AX135-75S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of pull force and 8590 N of push force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw lets you shorten the effective stroke by up to 75 mm from the nominal 135 mm, creating a 60 to 135 mm usable travel window. It functions as a mechanical stop for end-position tuning and does not lock the load without live air pressure.
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