Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 45mm 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
- Stroke45 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-40S
The AirTAC SAIJ125X45-40-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 45 mm stroke that can be dialed back by up to 40 mm, yielding a precise 5 to 45 mm usable travel window for exact end-position tuning. Delivering 6136 N of push force at 0.5 MPa, it handles heavy actuation with ease.
This unit is configured with a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and includes a magnet for position sensing. It is compatible with AirTAC CMSE reed and DMSE electronic switches fitted into the dual-side sensor grooves on the extruded aluminum barrel.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 45 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 SAIJ125AX45-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×45 | 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 SAIJ125AX45-40S Is Used
Changeover Calibration
Dial in the 5-45 mm travel window during product size transitions on a packaging line without replacing the cylinder.
Heavy Clamping
Leverage 6136 N of thrust at 0.5 MPa to secure heavy workpieces while fine-tuning the exact clamp contact point.
Variable End Stops
Set precise retract positions on automated machinery, using the rear screw to trim up to 40 mm off the nominal stroke.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-40S the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (offering 3927 N push at 0.5 MPa) lacks the necessary thrust, but a 160 mm bore (10053 N) would be excessive overkill. The 40 mm adjustment range is ideal for machine setups requiring variable end stops during product changeovers, eliminating the need to physically swap cylinders or bolt on external stops. Mounting options are limited to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). Port threads are PT tapered.
Because the stroke is under 300 mm, side-load stress on the 32 mm rod is manageable without an external guide. Note that the rear adjuster acts strictly as a travel stop to work alongside the variable air cushions; it does not hold the load without live air. For true load-holding without pressure, consider an SAIL pneumatic lock, a BSAI clamp-lock, or an external rod lock.
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 SAIJ125AX45-40S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can deliver up to 8590 N of push force at 0.7 MPa.
The rear adjuster screw acts as a mechanical stop that can trim the effective travel by up to 40 mm. This turns the nominal 45 mm stroke into a 5 to 45 mm usable window, allowing you to fine-tune the retract end position at commissioning without altering the cylinder mount.
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