This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X75FA, 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 SI125X75FA
The AirTAC Airtac SI125 Standard Cylinder SI125X75FA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 75mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X75FA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke75 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X75FA
- 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 SI125X75FA
The AirTAC SI125X75FA is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 75 mm stroke, delivering 6136 N push force at 0.5 MPa. It is replaced by the SAI125X75FA direct, which preserves the exact bore, stroke, force, G1/2 port and FA flange mounting interface. The SAI upgrade features an improved piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life.
Note that this specific SKU lacks a magnet (-S) and therefore cannot accept position sensors. If your application requires high-temperature operation up to 150 C, the Viton H seal option is available.
Airtac SI125 Standard Cylinder SI125X75FA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X75FA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X75FA |
| Bore size | Ø125 mm |
| Stroke | 75 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 SAI125X75FA 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 SAI125X75FA 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 SI125X75FA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×75 | 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 SI125X75FA Is Used
Heavy Press Clamping
Ideal for applying large clamping forces in automated press lines, utilizing the 6136 N push force at 0.5 MPa to secure heavy workpieces during machining.
Industrial Stamping
Drives robust stamping and forming operations requiring high output force and a short 75 mm stroke, benefiting from the 30-500 mm/s speed range.
Pallet Positioning
Shifts or indexes heavy loaded pallets in material handling systems where the 313 kg vertical lift capacity and FA flange mount provide reliable actuation.
Replacing the Airtac SI125 Standard Cylinder SI125X75FA with the SAI125X75FA
To replace the discontinued SI125X75FA, order the SAI125X75FA. Confirm the ISO 15552 FA flange interface, 125 mm bore, 75 mm stroke, G1/2 port (PT/G/NPT thread options) and the absence of a magnet. Sizing both ways: a 100 mm bore yields 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. A plain cylinder drifts on air loss—the cushion only decelerates near stroke end—so for load holding use an external pilot check valve or the SAIL/BSAI lock variants. The SAI family also adds the SAIF self-valve option (bores 32-100) which this SI lacked.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X75FA
- ✓ 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 SI125X75FA FAQ
Yes, the SI125X75FA is discontinued. The direct replacement is the AirTAC SAI125X75FA. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 75 mm stroke, G1/2 port, FA flange mount and output force.
This double-acting cylinder features a G1/2 air port and M27x2 rod thread. It delivers 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 theoretical maximum of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X75FA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X75FA replacement — usually within 7-8 hours.