This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X165, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI125 Standard Cylinder SI125X165
The AirTAC SI125 Standard Cylinder SI125X165 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 165mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X165, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke165 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X165
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI125 Standard Cylinder SI125X165
The AirTAC SI125X165 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 165 mm stroke, delivering 6136 N push force at 0.5 MPa. The direct replacement is the SAI125X165, which preserves the exact G1/2 port, M27x2 rod thread, and 40 mm adjustable air cushions.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this non-magnet SKU cannot take a sensor; legacy CS1-B/DS1-B switches require the -S version.
Airtac SI125 Standard Cylinder SI125X165 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X165 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X165 |
| Bore size | Ø125 mm |
| Stroke | 165 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| 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 standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI125X165 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / 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 | |
The SAI125X165 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI125 Standard Cylinder SI125X165
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×165 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI125 Standard Cylinder SI125X165 Is Used
Heavy Stamp Press Feed
Drives robust clamping arms in automated press lines, utilizing the 6136 N push force at 0.5 MPa to secure heavy steel blanks before stamping.
Pallet Positioner Gate
Actuates high-mass diverter gates on conveyor systems, relying on the 40 mm adjustable air cushions to smoothly decelerate the 32 mm rod at stroke ends.
Industrial Mold Ejector
Pushes large injection molds or cast components out of fixtures, where the 125 mm bore provides the necessary raw force to overcome initial static friction.
Replacing the Airtac SI125 Standard Cylinder SI125X165 with the SAI125X165
To replace the SI125X165, order the SAI125X165 and confirm the ISO 15552 mounting interface, 125 mm bore, 165 mm stroke, G1/2 port (PT/G/NPT), and mounting accessory. Because this SKU lacks the -S magnet, it cannot accept position sensors; order the -S variant if you need CS1-B/DS1-B switches. Sizing both ways: dropping to an 80 mm bore yields 2513 N push @0.5 MPa, while stepping up to 160 mm provides 10053 N. The air cushion only decelerates the load; it does not hold position. For dead-load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variants. With a 165 mm stroke, side-load and rod-bending forces are minimal, but always guide the load to prevent misalignment.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X165
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI125 Standard Cylinder SI125X165 FAQ
Yes, the AirTAC SI125X165 is discontinued. The direct replacement is the SAI125X165. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 165 mm stroke, output force, G1/2 port, and mounting interface.
The 125 mm bore features a G1/2 air port. At 0.5 MPa it provides 6136 N push and 5734 N pull force. At 0.7 MPa push is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X165
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X165 replacement — usually within 7-8 hours.