Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-50 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 SAIJ125AX135-50
The AirTAC SAIJ125X135-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a usable travel window of 85 to 135 mm. Delivering 6136 N of push force at 0.5 MPa, it is built with an SUS420J2 stainless steel rod for enhanced durability against lateral loads. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE or DMSE switches.
This model uses a PT tapered G1/2 port and omits the FB, CA, CB, and CR mounting styles, offering a focused set of ISO 15552 interfaces (Basic, FA, LB, TC, FTC, TCM1, TCM2). The rear adjuster acts strictly as a travel stop for end-position tuning during commissioning; it does not lock or hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-50 |
|---|---|
| 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 SAIJ125AX135-50
| 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 SAIJ125AX135-50 Is Used
Machine Setup & Changeover
Dial in the exact end-position from 85 to 135 mm during product changeovers without physically swapping the cylinder or bolting on external stops.
Variable End-Stop Positioning
Fine-tune the retract stroke on the fly to accommodate varying workpiece sizes, leveraging the 50 mm adjustment window for precise mechanical limits.
Heavy Forming & Pressing
Utilize the 11045 N of push force at 0.9 MPa for robust pressing tasks, relying on the SUS420J2 stainless rod to withstand demanding industrial loads.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-50 the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial thrust—such as 6136 N at 0.5 MPa or 11045 N at 0.9 MPa—along with precise end-position tuning. If your force requirements are lower, stepping down to an 80 mm bore yields 2513 N at 0.5 MPa, whereas a 160 mm bore provides 10053 N for heavier demands. The 50 mm adjustment range is ideal for product changeovers, allowing you to dial in the exact stroke without swapping cylinders or adding external stops.
For replacing an ISO 15552 cylinder, match the 125 mm bore, 135 mm nominal stroke, 50 mm adjustment code, PT G1/2 port, and desired mounting interface. Note that the SAIJ125X135-50 operates at 30-500 mm/s. Because the stroke is 135 mm, ensure adequate external guiding if the load is heavy or prone to side-loading, as the rear stopper and air cushion only decelerate travel and do not hold the load without continuous air pressure.
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 SAIJ125AX135-50 FAQ
At 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 mechanically shorten the effective stroke by up to 50 mm, creating a usable travel window of 85 to 135 mm. It functions as a travel stop for end-position tuning and does not lock the load without live air pressure.
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