This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X150FA, 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 SI125X150FA
The AirTAC SI125 Standard Cylinder SI125X150FA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 150mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X150FA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke150 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X150FA
- 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 SI125X150FA
The AirTAC SI125X150FA is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore, 150 mm stroke, and FA flange mounting. Delivering 6136 N push force at 0.5 MPa, it is directly replaced by the SAI125X150FA. This direct successor shares the exact interface, G1/2 port, and M27x2 rod thread, fitting existing fixtures seamlessly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks a magnet and cannot take a sensor; for load holding, use an external rod lock or SAIL/BSAI variant, as cushions only decelerate.
Airtac SI125 Standard Cylinder SI125X150FA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X150FA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X150FA |
| Bore size | Ø125 mm |
| Stroke | 150 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 SAI125X150FA 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 SAI125X150FA 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 SI125X150FA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×150 | 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 SI125X150FA Is Used
Heavy Press Operations
Ideal for applying high clamping forces up to 6136 N at 0.5 MPa in automotive and heavy assembly lines.
Large Mold Handling
Shifts and positions substantial injection molds or tooling using the FA flange mount over a 150 mm stroke.
Replacing the Airtac SI125 Standard Cylinder SI125X150FA with the SAI125X150FA
To replace the SI125X150FA, order the SAI125X150FA. Confirm the ISO 15552 FA flange interface, 150 mm stroke, and G1/2 port (PT/G/NPT thread options). This non-magnetic SKU cannot accept CS1-B/DS1-B sensors. For sizing, the 125 mm bore yields 6136 N push at 0.5 MPa; if less force is needed, an 80 mm bore provides 2513 N. For holding loads without live air, select the SAIL or BSAI lock variant, as the standard cushion only decelerates.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X150FA
- ✓ 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 SI125X150FA FAQ
Yes, the SI125X150FA is discontinued. The direct replacement is the SAI125X150FA, which maintains the same ISO 15552 FA flange interface, 125 mm bore, 150 mm stroke, and G1/2 port.
This double-acting cylinder uses a G1/2 port. 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 max of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X150FA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X150FA replacement — usually within 7-8 hours.