This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X430SFA, 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 SI125X430SFA
The AirTAC SI125 Standard Cylinder SI125X430SFA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 430mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X430SFA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke430 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X430SFA
- 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 SI125X430SFA
The AirTAC SI125X430SFA is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 430 mm stroke. Delivering 6136 N push force at 0.5 MPa, it features an FA flange mount and a G1/2 port. AirTAC replaced this legacy unit with the SAI125X430SFA, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, output force, and accessories.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces SAIL, SAIF, and BSAI lock or valve variants absent in the SI line. The built-in magnet supports CS1-B/DS1-B sensors, and seal options include Viton H for high-heat duties.
Airtac SI125 Standard Cylinder SI125X430SFA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X430SFA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X430SFA |
| Bore size | Ø125 mm |
| Stroke | 430 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 SAI125X430SFA 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 SAI125X430SFA 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 SI125X430SFA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×430 | 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 SI125X430SFA Is Used
Heavy Press Operations
Ideal for applying high clamping forces in automated stamping and metal forming lines using the 6136 N push capacity.
Large Material Diversion
The 430 mm stroke easily pushes heavy pallets or bulk materials across wide conveyor belts in logistics hubs.
Industrial Door Actuation
Provides the long travel and robust force necessary to open and close large loading dock doors securely.
Replacing the Airtac SI125 Standard Cylinder SI125X430SFA with the SAI125X430SFA
To replace the discontinued SI125X430SFA, order the SAI125X430SFA. Confirm the ISO 15552 FA flange mounting, 430 mm stroke, G1/2 port, and the -S magnet for legacy CS1-B/DS1-B switches (the SAI uses current AirTAC switches). If sizing alternatives, neighboring bores offer different force classes; this 125 mm bore yields 6136 N push at 0.5 MPa. For load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates. Use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Because the 430 mm stroke is long, use external guides to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X430SFA
- ✓ 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 SI125X430SFA FAQ
Yes, the SI125X430SFA is discontinued. The direct replacement is the SAI125X430SFA. It shares the same ISO 15552 mounting interface, 125 mm bore, 430 mm stroke, G1/2 port, and FA flange, fitting directly into existing fixtures.
This double-acting cylinder has 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. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X430SFA
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