This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX10S, 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 SI125AX10S
The AirTAC SI125 Standard Cylinder SI125AX10S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 10mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX10S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke10 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX10S
- 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 SI125AX10S
The AirTAC SI125AX10S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 10 mm stroke. It delivers 6136 N push force at 0.5 MPa and features a SUS420J2 stainless steel rod, G1/2 port, and a built-in magnet for CS1-B/DS1-B sensors. The direct replacement is the SAI125AX10S, sharing the same ISO 15552 mounting interface, force, and port size.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI125 Standard Cylinder SI125AX10S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX10S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX10S |
| Bore size | Ø125 mm |
| Stroke | 10 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 SAI125AX10S 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 SAI125AX10S 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 SI125AX10S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×10 | 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 SI125AX10S Is Used
High-Force Clamping
Secures heavy steel plates in machining fixtures using 6136 N of thrust at 0.5 MPa within a compact 10 mm stroke.
Short-Stroke Pressing
Performs high-tonnage pressing and riveting operations where a 125 mm bore delivers concentrated force over a brief travel.
Stainless Rod Actuation
Actuates tooling in washdown or mildly corrosive environments using the SUS420J2 stainless piston rod option.
Replacing the Airtac SI125 Standard Cylinder SI125AX10S with the SAI125AX10S
To replace the SI125AX10S, order the SAI125AX10S. Confirm the ISO 15552 mounting interface, 125 mm bore, 10 mm stroke, G1/2 port, and the -S magnet for current AirTAC switches. Sizing both ways: a 100 mm bore yields 3927 N at 0.5 MPa, while a 160 mm bore yields 10053 N. Note that a plain cylinder drifts without live air; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. The SUS420J2 rod resists corrosion. At 10 mm stroke, rod buckling is negligible, but always control side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX10S
- ✓ 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 SI125AX10S FAQ
Yes, the SI125AX10S is discontinued. The direct replacement is the SAI125AX10S. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 10 mm stroke, 6136 N force, G1/2 port, and mounting interface.
It uses a G1/2 air port. 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. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX10S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX10S replacement — usually within 7-8 hours.