This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X15, 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 SI125X15
The AirTAC SI125 Standard Cylinder SI125X15 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 15mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X15, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke15 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X15
- 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 SI125X15
The AirTAC SI125X15 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 15 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. AirTAC replaced this legacy unit with the SAI125X15, a direct sharing the exact ISO 15552 mounting interface, bore, stroke, force and port size.
The SAI upgrade features a modernized piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. Note this specific SKU lacks a magnet (-S), meaning it cannot accept CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X15 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X15 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X15 |
| Bore size | Ø125 mm |
| Stroke | 15 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 SAI125X15 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 SAI125X15 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 SI125X15
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×15 | 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 SI125X15 Is Used
High-Force Clamping
Secures heavy steel plates in machining fixtures using 6136 N of thrust at 0.5 MPa.
Short-Stroke Pressing
Performs rapid 15 mm stamping and seating operations for industrial components.
Rugged Ejection
Ejects dense molded parts from presses, utilizing the 125 mm bore for high impact force.
Replacing the Airtac SI125 Standard Cylinder SI125X15 with the SAI125X15
To replace this discontinued SI125X15, order the SAI125X15. Confirm your existing fixture matches the ISO 15552 mounting interface dimensions, the G1/2 air port, and the M27x2 rod-end thread. Because this SKU has no magnet, it cannot support position sensing; if switches are needed, specify an SAI125X15S. When sizing, note a neighbouring 100 mm bore yields 3927 N push at 0.5 MPa, while a 160 mm bore provides 10053 N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding consider an external pilot check valve or the SAIL/BSAI lock variants. With a 15 mm stroke, side-load risks are minimal, but always verify rod alignment.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X15
- ✓ 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 SI125X15 FAQ
Yes, the SI125X15 is discontinued. The direct replacement is the SAI125X15. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 15 mm stroke, 6136 N force, G1/2 port and mounting interface.
The G1/2 port feeds a 32 mm rod. Force output is 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 SAI125X15
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X15 replacement — usually within 7-8 hours.