Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-10
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-10 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 SAIJ125AX135-10
The AirTAC SAIJ125X135-10 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 125 to 135 mm, allowing you to dial back the nominal stroke by up to 10 mm during commissioning. Delivering 6136 N of push force at 0.5 MPa, it handles heavy loads while utilizing a PT tapered G1/2 port and a 40 mm cushion length to manage end-of-travel energy.
This model features a SUS420J2 stainless steel rod (material code A) for improved corrosion resistance and includes dual sensor grooves on the extruded aluminum barrel. Because the rear adjuster acts strictly as a mechanical stop and the air cushion only decelerates the load, this cylinder cannot hold a load without live air pressure. For position-holding requirements, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-10 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-10 |
|---|---|
| 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 SAIJ125AX135-10
| 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 SAIJ125AX135-10 Is Used
Machining End-Stop Tuning
Fine-tune the 125 to 135 mm travel window during machine setup to achieve exact clamping positions without machining external spacers.
Product Changeover
Quickly adjust the retract end-position by up to 10 mm on packaging lines when switching to a different product size.
Heavy Assembly Pressing
Leverage the 6136 N push force to seat heavy components, using the rear stop to prevent over-travel during final assembly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-10 the Right Cylinder?
Choose this 125 mm bore cylinder when an 80 mm bore (providing 2513 N push force at 0.5 MPa) is insufficient for your dynamic load, or step down if an 80 mm bore offers enough thrust. The 10 mm adjustment range is ideal for applications requiring exact end-position tuning during product changeover without swapping the cylinder or adding external stops. With a 135 mm stroke, side-load risks are moderate, but ensuring proper external guiding remains best practice.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 135 mm stroke, 10 mm adjustment, PT G1/2 port, and the required mounting style from the SAIJ set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that SAIJ omits FB, CA, CB, and CR mounts. This unit lacks a magnet; add the -S suffix if CMSE reed or DMSE electronic sensors are needed.
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 SAIJ125AX135-10 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. The maximum force is 1251 kgf at 1.0 MPa.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective travel from 135 mm down to 125 mm. This enables precise end-position tuning at commissioning without replacing the cylinder.
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