This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X30FA, 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 SI125X30FA
The AirTAC Airtac SI125 Standard Cylinder SI125X30FA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 30mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X30FA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke30 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X30FA
- 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 SI125X30FA
The AirTAC SI125X30FA is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 30mm stroke. It delivers 6136N push force at 0.5MPa through a G1/2 port. The direct replacement is the SAI125X30FA, matching the exact FA flange mounting interface, M27x2 rod thread and output force.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. This no-S SKU lacks a magnet and cannot take a sensor. For high heat, Viton H seals raise the temperature limit to 150C.
Airtac SI125 Standard Cylinder SI125X30FA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X30FA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X30FA |
| Bore size | Ø125 mm |
| Stroke | 30 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 SAI125X30FA 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 SAI125X30FA 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 SI125X30FA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×30 | 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 SI125X30FA Is Used
Heavy Stamping Clamp
Secures large steel plates in a press line using the 6136N push force and rigid FA flange mount.
Injection Mold Ejector
Short 30mm stroke provides high-impact ejection of molded parts, leveraging the 125mm bore power.
Pallet Stopper Gate
Acts as a heavy-duty physical stop for inbound logistics conveyors, holding against high inertial loads.
Replacing the Airtac SI125 Standard Cylinder SI125X30FA with the SAI125X30FA
To replace the SI125X30FA, order the SAI125X30FA keeping the 125mm bore, 30mm stroke, G1/2 port and FA flange. Because this is a no-S SKU, it cannot accept a magnetic sensor; if sensing is needed, order the SAI with an S suffix for CS1-B/DS1-B compatibility. Sizing both ways: the 125mm bore yields 6136N push at 0.5MPa, whereas the neighbouring 100mm bore offers 3927N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use the SAIL lock or BSAI clamp-lock variant, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X30FA
- ✓ 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 SI125X30FA FAQ
Yes, the SI125X30FA is discontinued. The direct replacement is the SAI125X30FA. It is dimensionally interchangeable per ISO 15552, retaining the same 125mm bore, 30mm stroke, G1/2 port, FA flange mount and force ratings.
The 125mm bore provides 6136N push and 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N at 0.9MPa, and a theoretical max of 1251 kgf at 1.0MPa. Operating speed is 30-500 mm/s. The port is G1/2.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X30FA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X30FA replacement — usually within 7-8 hours.