This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX30S, 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 SI125AX30S
The AirTAC SI125 Standard Cylinder SI125AX30S 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 SAI125AX30S, 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 → SAI125AX30S
- 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 SI125AX30S
The AirTAC SI125AX30S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 30 mm stroke. Built with an extruded aluminum barrel and a SUS420J2 stainless piston rod, it delivers 6136 N push force at 0.5 MPa through a G1/2 port. AirTAC replaced this legacy unit with the SAI125AX30S, a direct replacement sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This magnet-equipped (-S) SI unit accepts legacy CS1-B/DS1-B sensors, while the SAI family introduces SAIL lock and BSAI clamp-lock variants absent from the original line.
Airtac SI125 Standard Cylinder SI125AX30S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX30S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX30S |
| 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 SAI125AX30S 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 SAI125AX30S 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 SI125AX30S
| 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 SI125AX30S Is Used
Heavy Stamping Press
Drives heavy tooling in automated stamping lines, utilizing the 6136 N push force at 0.5 MPa for reliable metal forming operations.
Pallet Diverting
Actuates heavy-duty diverters on high-capacity conveyors, where the robust 32 mm rod handles side loads during large product routing.
Automated Guided Vehicles
Provides lifting and positioning power on heavy AGV platforms, with the SUS420J2 stainless rod resisting harsh industrial environments.
Replacing the Airtac SI125 Standard Cylinder SI125AX30S with the SAI125AX30S
To replace the SI125AX30S, order the SAI125AX30S. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the 30 mm stroke, the G1/2 air port, and the built-in magnet (-S) for current AirTAC switches. Sizing both ways: a 100 mm bore yields 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. This 125 mm bore provides 6136 N push and 5734 N pull at 0.5 MPa. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for held loads. The SUS420J2 rod (A) suits corrosive environments, and a Viton H seal extends heat to 150 C.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX30S
- ✓ 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 SI125AX30S FAQ
Yes, the SI125AX30S is discontinued. The direct replacement is the SAI125AX30S. It shares the identical ISO 15552 mounting interface, 125 mm bore, 30 mm stroke, G1/2 port, and output force, fitting directly into existing fixtures.
It uses a G1/2 port. The force ratings 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 theoretical max of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX30S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX30S replacement — usually within 7-8 hours.