This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X910S, 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 SI125X910S
The AirTAC SI125 Standard Cylinder SI125X910S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 910mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X910S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke910 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X910S
- 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 SI125X910S
The AirTAC SI125X910S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 910 mm stroke. Generating 6136 N push force at 0.5 MPa, it is replaced direct by the SAI125X910S. The SAI retains the exact G1/2 port, M27x2 thread, and mounting interface, fitting existing fixtures perfectly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The -S suffix means this legacy SKU uses CS1-B/DS1-B sensors, whereas the SAI uses current AirTAC switches. For high heat, Viton H seals raise the -20 to +70 C range to 150 C.
Airtac SI125 Standard Cylinder SI125X910S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X910S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X910S |
| Bore size | Ø125 mm |
| Stroke | 910 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 SAI125X910S 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 SAI125X910S 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 SI125X910S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×910 | 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 SI125X910S Is Used
Heavy Stamp Press Feed
Pushes large metal blanks into a hydraulic press, utilizing the 6136 N force at 0.5 MPa to move heavy stock reliably over the 910 mm travel.
Pallet Discharge Station
Ejects loaded pallets from an accumulation line, requiring the 125 mm bore's substantial thrust and the 910 mm stroke to clear the conveyor entirely.
Automated Waste Compaction
Compresses industrial waste in a large hopper, where the 313 kg vertical lift capacity and long stroke provide the necessary volume reduction.
Replacing the Airtac SI125 Standard Cylinder SI125X910S with the SAI125X910S
To replace this SI with the SAI125X910S, verify the ISO 15552 mounting interface, 910 mm stroke, G1/2 port, and your mounting accessory. The SAI family also adds SAIL and BSAI lock variants absent in the SI line. A plain cylinder drifts on air loss as the cushion only decelerates; use an external rod lock or pilot check valve for holding. With a 910 mm stroke, prevent rod bending by using external guides to absorb side loads. Sizing both ways: neighbor bores are 100 mm (3927 N push @0.5) and 160 mm (10053 N push @0.5). This 125 mm bore yields 6136 N push and 5734 N pull @0.5 MPa, 8590 N @0.7, and 1251 kgf max @1.0 MPa. Speed is 30-500 mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X910S
- ✓ 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 SI125X910S FAQ
Yes, the SI125X910S is discontinued. The direct replacement is the SAI125X910S. It is dimensionally interchangeable per ISO 15552, keeping the same 125 mm bore, 910 mm stroke, output force, G1/2 port, and mounting accessories.
The G1/2 port is fixed by the 125 mm bore. It delivers 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, and a theoretical maximum of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X910S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X910S replacement — usually within 7-8 hours.