Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 165mm 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
- Stroke165 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-75
The AirTAC SAIJ125X165-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 90-165 mm usable travel window. It delivers robust performance with 6136 N push force at 0.5 MPa, utilizing a PT tapered G1/2 port. The standard extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
This configuration uses a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance over standard carbon steel. The rear adjuster acts purely as a travel stop to fine-tune end positions during commissioning; it is not a lock and cannot hold a load without live air pressure. Operating speed is rated for 30-500 mm/s, supported by 40 mm variable air cushions at both ends.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 165 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 SAIJ125AX165-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×165 | 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 SAIJ125AX165-75 Is Used
Machine Setup & Changeover
Dial in the exact 90-165 mm end position during product size changeovers without physically swapping the cylinder or bolting on external stops.
Variable End Stops
Fine-tune the retract distance on the fly to accommodate varying package dimensions or processing depths on automated material handling lines.
Heavy-Duty Positioning
Leverage the 6136 N thrust at 0.5 MPa to shift heavy pallets or tooling, using the rear screw to precisely set the retracted home position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-75 the Right Cylinder?
Select this 125 mm bore when an application requires the 6136 N thrust at 0.5 MPa and a highly flexible 90-165 mm end-position tuning range. The adjustable rear stopper is ideal for product-size changeovers on a line, allowing you to dial back the 165 mm nominal stroke by up to 75 mm without swapping cylinders or adding external stops. If your process demands less force, stepping down to an 80 mm bore yields 2513 N push force at 0.5 MPa.
For load-holding without continuous air pressure, this plain SAIJ cylinder is insufficient because its rear adjuster and air cushions only decelerate the travel end, acting neither as a brake nor a lock. In such cases, specify an SAIL (air-released lock) or BSAI (clamp-lock) cylinder, or fit an external pilot-operated check valve. To match this exact replacement, ensure the SKU specifies a 165 mm stroke, 75 mm adjustment, PT G1/2 port, SUS420J2 rod material, and no magnet. Because the 165 mm stroke is under 300 mm, side-load concerns are minimal, though long unsupported loads still need an external guide.
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 SAIJ125AX165-75 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjusting screw acts as a mechanical stopper, allowing you to shorten the effective stroke from its 165 mm nominal length by up to 75 mm. This creates a 90-165 mm usable travel window for fine-tuning end positions at commissioning.
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