Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 450mm 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
- Stroke450 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-40S
The AirTAC SAIJ125X450-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 410 to 450 mm usable travel window. Delivering 6136 N of push force at 0.5 MPa, it handles heavy loads while allowing precise retract end-position tuning during commissioning without swapping cylinders. The extruded aluminum barrel includes sensor grooves on both sides for straightforward switch placement.
This variant features a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and a PT tapered port thread. Equipped with a magnet (-S), it supports AirTAC CMSE reed and DMSE electronic solid-state sensors for position feedback. The 125 mm bore pairs with a 32 mm rod and M27x2 thread, managing side loads effectively on long 450 mm strokes when paired with an external guide.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 450 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 SAIJ125AX450-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×450 | 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 SAIJ125AX450-40S Is Used
Product Changeover
Dial in the 410-450 mm retract end-stop during format changeovers on heavy packaging lines without changing the cylinder.
Variable End Stops
Fine-tune the stopping position of large pallets or workpieces at commissioning using the rear adjuster screw.
Heavy Assembly Pressing
Leverage 6136 N of thrust at 0.5 MPa for pressing components, using the adjustable stroke to set precise pressing depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-40S the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (offering 3927 N push at 0.5 MPa) is insufficient, but a 160 mm bore (10053 N) is physically oversized. The 40 mm adjustment range is ideal for variable end-stops and product-size changeovers on a line, providing a mechanical stop rather than adding external shims. For applications requiring the cylinder to hold its load without live air pressure, select a SAIL pneumatic lock or BSAI clamp-lock cylinder instead, as the rear adjuster only sets the travel end.
When matching an ISO 15552 replacement, verify the 450 mm stroke, 40 mm adjustment, PT G1/2 ports, and the -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. Because the stroke is 450 mm, an external guide is recommended 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 SAIJ125AX450-40S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.7 MPa.
The rear adjuster screw allows you to mechanically shorten the effective stroke by up to 40 mm, creating a 410 to 450 mm usable travel window. It acts as a travel stop to fine-tune end positions and does not lock the load without live air pressure.
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