Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-100 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 SAIJ125AX135-100
The AirTAC SAIJ125X135-100 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 135 mm stroke that can be dialed back by up to 100 mm, yielding a highly flexible 35-135 mm usable travel window for precise end-position tuning during commissioning. Delivering 6136 N of push force at 0.5 MPa, it handles heavy loads without needing a cylinder swap or external stops.
This unit features a SUS420J2 stainless steel rod for enhanced durability against moisture and minor corrosion compared to standard carbon steel. Operating at 30-500 mm/s, it includes adjustable air cushions at both ends to manage kinetic energy. The rear adjuster acts purely as a travel stop to set the retract position, meaning it will not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-100 |
|---|---|
| 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 SAIJ125AX135-100
| 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 SAIJ125AX135-100 Is Used
Machine Changeover
Dial in the exact retract stop from 35 to 135 mm when switching product sizes on a line, avoiding physical cylinder swaps.
Press Positioning
Fine-tune the end position of a heavy press operation, using the 6136 N push force to form or seat components accurately.
Assembly Calibration
Adjust the effective stroke during commissioning to perfectly mate parts without adding bulky external mechanical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-100 the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial force (6136 N push at 0.5 MPa) alongside variable end-of-stroke positioning. If your setup needs less force, stepping down to a 100 mm bore yields 3927 N; if more is required, a 160 mm bore provides 10053 N. Choose this adjustable-stroke SAIJ over a fixed SAI model when you need to fine-tune the retract distance on the fly during machine changeover.
For an exact ISO 15552 replacement, match the 125 mm bore, 135 mm stroke, 100 mm adjustment, PT tapered ports, and your required mounting from the SAIJ set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the stroke is 135 mm, ensure adequate external guiding to prevent excessive side-loading on the rod.
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 SAIJ125AX135-100 FAQ
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. At the maximum operating pressure of 0.9 MPa, the push force increases to 11045 N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 135 mm nominal stroke by up to 100 mm, creating a 35-135 mm usable travel window. It only sets the end position and does not lock the load without live air pressure.
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