This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X100, 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 SI125X100
The AirTAC SI125 Standard Cylinder SI125X100 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 100mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X100, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke100 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X100
- 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 SI125X100
The AirTAC SI125X100 is a discontinued double-acting ISO 15552 profile cylinder featuring an extruded aluminum barrel and adjustable air cushions at both ends. Delivering 6136 N of push force at 0.5 MPa, it is replaced directly by the SAI125X100. This current-production direct maintains the exact bore, stroke, G1/2 port, and mounting interface, fitting existing fixtures seamlessly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. For this non-magnet SKU, position sensing is not possible. The SAI family also adds SAIL and BSAI lock variants absent from the SI line.
Airtac SI125 Standard Cylinder SI125X100 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X100 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X100 |
| Bore size | Ø125 mm |
| Stroke | 100 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 SAI125X100 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 SAI125X100 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 SI125X100
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×100 | 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 SI125X100 Is Used
Heavy Stamping Press
Drives robust tooling in automated metal forming, utilizing the 6136 N push force at 0.5 MPa to actuate heavy dies and presses reliably.
Mold Clamping Station
Secures large injection molds or heavy industrial fixtures during processing, relying on the 32 mm piston rod for structural rigidity.
Replacing the Airtac SI125 Standard Cylinder SI125X100 with the SAI125X100
To replace the SI125X100, order the SAI125X100, confirming the ISO 15552 mounting interface, 125 mm bore, 100 mm stroke, and G1/2 port (available in PT, G, or NPT). Because this specific SKU lacks the -S magnet suffix, it cannot accept a CS1-B or DS1-B sensor. If your application requires position detection, select an SAI125X100S instead. When sizing, neighboring bores offer different force classes: the 100 mm bore provides 3927 N push at 0.5 MPa, while the 160 mm bore yields 10053 N. Note that a plain cylinder drifts on air loss; the cushions only decelerate near stroke end. For load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X100
- ✓ 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 SI125X100 FAQ
Yes, the SI125X100 is discontinued. The direct replacement is the AirTAC SAI125X100. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 100 mm stroke, output force, G1/2 port, and mounting accessories.
This double-acting cylinder features a G1/2 air port and a 32 mm rod with an M27x2 thread. It delivers 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 SAI125X100
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X100 replacement — usually within 7-8 hours.