Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-40S 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 SAIJ125X135-40S
The AirTAC SAIJ125X135-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 95 to 135 mm. It delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suited for heavy-duty positioning tasks. The extruded aluminum barrel features sensor grooves on both sides, and because this variant includes a magnet (-S), it integrates directly with AirTAC CMSE reed and DMSE electronic solid-state switches.
This model uses a PT tapered port thread and a robust 32 mm carbon steel rod with an M27x2 thread, which handles substantial side loads. The rear adjustment screw acts purely as a mechanical stop to fine-tune the retract end position during commissioning; it does not lock the load without continuous live air. For applications requiring position holding without pneumatic pressure, an external rod lock or related types like the SAIL or BSAI cylinders are required.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-40S |
|---|---|
| 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 SAIJ125X135-40S
| 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 SAIJ125X135-40S Is Used
Product Size Changeovers
Dial in the 95 to 135 mm travel window during production line changeovers to accommodate different package dimensions without changing the cylinder.
Heavy Fixture Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy machining fixtures, using the rear stopper to fine-tune the exact clamping position.
Commissioning End-Stop Tuning
Precisely adjust the retract end-position during initial machine commissioning to prevent mechanical interference, avoiding external stopper hardware.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-40S the Right Cylinder?
Select this 125 mm bore when an 80 mm bore (providing 2513 N push at 0.5 MPa) is insufficient for moving heavy fixtures, but a 160 mm bore (10053 N) would be excessive. The 40 mm adjustment range is specifically valuable for machine setups requiring variable end-stops during product size changeovers, eliminating the need to physically swap out a fixed-stroke SAI cylinder. To ensure a true ISO 15552 replacement match, verify the 135 mm stroke, 40 mm adjuster, PT port, and the required mounting style from the available set: Basic, FA, LB, TC, FTC, TCM1, or TCM2. Although the 32 mm rod manages high stress, any stroke at or above 300 mm would require an external guide; at 135 mm, the internal rod is well-suited for the load if side forces are minimized.
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 SAIJ125X135-40S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder provides a push force of 6136 N and a pull force of 5734 N. At the maximum rated pressure of 1.0 MPa, it achieves a maximum push force equivalent to 1251 kgf.
The rear adjuster screw allows you to shorten the nominal 135 mm stroke by up to 40 mm, creating a usable travel window of 95 to 135 mm. This mechanical stop fine-tunes the end position but does not hold the load without live air pressure.
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