Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-75S 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 SAIJ125X135-75S
The AirTAC SAIJ125X135-75-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 60 to 135 mm, allowing you to dial back the nominal stroke by up to 75 mm during machine commissioning without swapping out the unit. Delivering 6136 N of push force at 0.5 MPa, it is built for heavy-duty positioning.
This variant includes a carbon steel piston rod and a -S magnet for electronic DMSE or reed CMSE switches housed in the dual-side sensor grooves. It uses a PT tapered G1/2 port and omits the FB, CA, CB, and CR mounts, retaining the standard Basic, FA, LB, TC, FTC, TCM1, and TCM2 interfaces.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-75S |
|---|---|
| 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 SAIJ125X135-75S
| 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 SAIJ125X135-75S Is Used
Variable End-Stop Tuning
Dial in the exact 60 to 135 mm travel limit during machine setup to accommodate different material thicknesses without adding external stopper blocks.
Product Changeover
Quickly reposition the retract end-stop on a packaging line when switching between product sizes, leveraging the 75 mm adjustment range.
Heavy-Duty Forming
Apply up to 11045 N of push force at 0.9 MPa for pressing or clamping operations, fine-tuning the final end position at commissioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-75S the Right Cylinder?
Choose this 125 mm bore when 8590 N of thrust at 0.7 MPa is required, stepping down from a 160 mm bore (14074 N at 0.7 MPa) or up from an 80 mm bore (3518 N at 0.7 MPa). The 75 mm adjustment range is ideal for product-size changeovers on a line, acting as a variable end-stop. For any stroke near or above 300 mm, you would normally add an external guide to handle side loads, but this shorter 135 mm travel keeps the unsupported rod highly stable.
The rear adjuster acts solely as a travel stop and deceleration point, not a lock. If your fixture must hold a load without live air pressure, select an AirTAC SAIL (air-released lock) or BSAI (clamp-lock) cylinder instead. This SAIJ model is dimensionally interchangeable per ISO 15552, featuring a PT port, carbon steel rod, and -S magnet configuration.
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 SAIJ125X135-75S FAQ
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. At the maximum operating pressure of 1.0 MPa, the push force reaches 1251 kgf.
The rear adjuster screw lets you shorten the 135 mm nominal stroke by up to 75 mm, creating a usable travel window of 60 to 135 mm. This stopper fine-tunes the end position but does not lock the load without live air pressure.
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