This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X15H, 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 SI125X15H
The AirTAC SI125 Standard Cylinder SI125X15H 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 SAI125X15H, 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 → SAI125X15H
- 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 SI125X15H
The AirTAC SI125X15H is a discontinued double-acting ISO 15552 profile cylinder featuring a 125 mm bore and 15 mm stroke. Built with an extruded aluminum barrel, it delivers 6136 N push force at 0.5 MPa and includes a high-temperature Viton H seal rated for 0 to 150 C. The direct replacement is the SAI125X15H, which matches the original G1/2 port, M27x2 rod thread, and mounting interface exactly.
Because this SKU lacks the -S magnet, it cannot accept position sensors. The SAI upgrade utilizes two Y-shaped one-way piston seals for lower start-up pressure and longer life.
Airtac SI125 Standard Cylinder SI125X15H Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X15H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X15H |
| 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 SAI125X15H 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 SAI125X15H 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 SI125X15H
| 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 SI125X15H Is Used
High-Temp Clamping
Short-stroke 6136 N clamping of heavy castings in hot environments up to 150 C using the Viton H seal.
Heavy Duty Ejection
Robust 125 mm bore ejection of dense parts from molds, leveraging 5734 N pull force at 0.5 MPa.
Industrial Pressing
Applying over 8590 N of pressing force at 0.7 MPa for seating heavy bearings in automated assemblies.
Replacing the Airtac SI125 Standard Cylinder SI125X15H with the SAI125X15H
To replace the SI125X15H, order the SAI125X15H. Confirm the ISO 15552 mounting interface, 125 mm bore, 15 mm stroke, G1/2 port (PT/G/NPT thread), and high-temp Viton H seal. This non-magnetic SKU cannot support switches; if sensing is needed, select an SAI model with the -S option for current AirTAC switches. Sizing downward, a 100 mm bore offers 3927 N push at 0.5 MPa; sizing upward, a 160 mm bore provides 10053 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants. Speed is 30-500 mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X15H
- ✓ 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 SI125X15H FAQ
Yes, the SI125X15H is discontinued. The direct replacement is the SAI125X15H. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 15 mm stroke, G1/2 port, and mounting interface.
This double-acting cylinder uses a G1/2 port. Force output is 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, and 11045 N push at 0.9 MPa. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X15H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X15H replacement — usually within 7-8 hours.