This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X175N, 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 SI125X175N
The AirTAC SI125 Standard Cylinder SI125X175N is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 175mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X175N, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke175 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X175N
- 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 SI125X175N
The AirTAC SI125X175N is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 175 mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the SAI125X175N, matching the exact interface, stroke and force.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. This no-magnet SKU cannot take a sensor, unlike CS1-B/DS1-B equipped units.
Airtac SI125 Standard Cylinder SI125X175N Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X175N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X175N |
| Bore size | Ø125 mm |
| Stroke | 175 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 SAI125X175N 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 SAI125X175N 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 SI125X175N
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×175 | 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 SI125X175N Is Used
Heavy Pressing
Drives large stamping and forming fixtures requiring 6136 N of push force at 0.5 MPa.
Pallet Handling
Shifts heavy loaded pallets laterally with a robust 32 mm rod and 175 mm stroke.
Clamp Actuation
Secures oversized industrial workpieces in machining cells using 125 mm bore power.
Replacing the Airtac SI125 Standard Cylinder SI125X175N with the SAI125X175N
To replace the SI125X175N, order the SAI125X175N. Confirm the ISO 15552 mounting interface, 175 mm stroke, G1/2 port, and NBR seals (-20 to +70 C). This SKU lacks a magnet, so it cannot accept position switches; choose an -S variant if sensing is needed. With 6136 N push at 0.5 MPa, downward sizing to a 100 mm bore gives 3927 N, while upward to 160 mm yields 10053 N. For load holding on air loss, note the cushion only decelerates; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X175N
- ✓ 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 SI125X175N FAQ
Yes, the SI125X175N is discontinued. The direct replacement is the SAI125X175N, a current ISO 15552 cylinder with the same 125 mm bore, 175 mm stroke, 6136 N force, G1/2 port and mounting interface.
It has a G1/2 port. Theoretical forces are: 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N push at 0.9 MPa, and a maximum of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X175N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X175N replacement — usually within 7-8 hours.