This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX160S, 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 SI125AX160S
The AirTAC SI125 Standard Cylinder SI125AX160S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 160mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX160S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke160 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX160S
- 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 SI125AX160S
The AirTAC SI125AX160S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 160 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125AX160S, matching the exact ISO 15552 mounting interface, stroke, force, and port size.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This -A variant uses a SUS420J2 stainless rod, and the -S magnet works with CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125AX160S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX160S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX160S |
| Bore size | Ø125 mm |
| Stroke | 160 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 SAI125AX160S 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 SAI125AX160S 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 SI125AX160S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×160 | 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 SI125AX160S Is Used
Heavy Press Clamping
Secures large automotive or structural components during machining, utilizing the 6136 N push force at 0.5 MPa to hold heavy steel fixtures firmly in place.
Pallet Diverting
Actuates heavy-duty diverters on high-capacity packaging lines, where the robust 32 mm SUS420J2 stainless rod withstands side-loading and harsh factory environments.
Replacing the Airtac SI125 Standard Cylinder SI125AX160S with the SAI125AX160S
To replace the SI125AX160S, order the SAI125AX160S to retain the identical ISO 15552 mounting interface, 125 mm bore, 160 mm stroke, M27x2 thread, G1/2 port, and -S magnet. For sizing down, the 100 mm bore yields 3927 N at 0.5 MPa; for higher capacity, the 160 mm bore provides 10053 N. If your application requires load holding on air loss, note that a plain cylinder drifts and the 40 mm cushion only decelerates—select the SAIL or BSAI lock variant, or add an external pilot check valve. The Viton H seal option raises the temperature limit to 150 C.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX160S
- ✓ 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 SI125AX160S FAQ
Yes, the SI125AX160S is discontinued. The direct replacement is the AirTAC SAI125AX160S. It shares the identical ISO 15552 mounting interface, 125 mm bore, 160 mm stroke, output force, G1/2 port, and mounting accessories, fitting directly into existing fixtures.
This 125 mm bore cylinder features a G1/2 air port and M27x2 rod thread. The thrust 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 maximum force of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX160S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX160S replacement — usually within 7-8 hours.