This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X136S, 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 SI125X136S
The AirTAC SI125 Standard Cylinder SI125X136S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 136mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X136S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke136 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X136S
- 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 SI125X136S
The AirTAC SI125X136S is a discontinued double-acting ISO 15552 profile cylinder. Delivering 6136 N push force at 0.5 MPa through a 125 mm bore, it features a G1/2 air port and an integrated magnet (-S) for legacy CS1-B/DS1-B sensors. AirTAC replaced this legacy unit with the SAI125X136S, a direct upgrade sharing the exact ISO 15552 mounting interface, stroke, and output force.
The SAI replacement runs an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also introduces lock variants (SAIL, BSAI) absent in the SI line, while rod material choices span carbon steel, SUS420J2, and SUS304.
Airtac SI125 Standard Cylinder SI125X136S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X136S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X136S |
| Bore size | Ø125 mm |
| Stroke | 136 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 SAI125X136S 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 SAI125X136S 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 SI125X136S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×136 | 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 SI125X136S Is Used
Heavy Press Operations
Drives large forming and stamping presses requiring 6136 N of thrust at 0.5 MPa, utilizing the 136 mm stroke for precise material deformation.
Mold Clamping Stations
Secures large industrial molds during machining or injection processes, relying on the rigid 32 mm piston rod and G1/2 pneumatic supply.
Replacing the Airtac SI125 Standard Cylinder SI125X136S with the SAI125X136S
To replace the SI125X136S, order the SAI125X136S. Verify your ISO 15552 mounting accessories (LB, FA, TC, etc.), the G1/2 port thread (PT/G/NPT), and the M27x2 rod thread. The -S suffix means a magnet is present for CS1-B/DS1-B switches; the SAI uses current AirTAC sensors. If you need to adjust force, the neighbouring bores are 100 mm and 160 mm. At 0.5 MPa, this 125 mm bore yields 6136 N push and 5734 N pull. Note that a standard cylinder drifts without live air—the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X136S
- ✓ 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 SI125X136S FAQ
Yes, the SI125X136S is discontinued. The direct replacement is the AirTAC SAI125X136S. It shares the identical ISO 15552 mounting interface, 125 mm bore, 136 mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly.
The 125 mm bore provides 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, and it uses a G1/2 port.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X136S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X136S replacement — usually within 7-8 hours.