This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X86S, 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 SI125X86S
The AirTAC SI125 Standard Cylinder SI125X86S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 86mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X86S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke86 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X86S
- 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 SI125X86S
The AirTAC SI125X86S is a discontinued double-acting ISO 15552 profile cylinder featuring a 125mm bore, 86mm stroke, and a G1/2 air port. Delivering 6136N push force at 0.5MPa, it is replaced by the SAI125X86S. This direct successor matches the exact ISO 15552 mounting interface, bore, stroke, and output force.
The SAI upgrade uses two Y-shaped one-way piston seals for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked. This SI-SKU's magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X86S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X86S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X86S |
| Bore size | Ø125 mm |
| Stroke | 86 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 SAI125X86S 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 SAI125X86S 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 SI125X86S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×86 | 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 SI125X86S Is Used
Heavy Pressing
Drives large stamping or forming presses requiring 6136N of push force at 0.5MPa with a 125mm bore.
Pallet Handling
Indexes heavy loaded pallets using the 86mm stroke, relying on the 40mm adjustable air cushions for smooth stops.
Automated Clamping
Secures large workpieces in machining cells, where the 313kg vertical lift capacity handles substantial part weights.
Replacing the Airtac SI125 Standard Cylinder SI125X86S with the SAI125X86S
To replace the SI125X86S, order the SAI125X86S. Confirm the ISO 15552 mounting accessory (LB, FA, CA, TC) and the G1/2 port (PT/G/NPT). The 86mm stroke is non-standard but uses the same M27x2 rod thread. If you need more force than the 6136N at 0.5MPa, step up to a 160mm bore; if less, drop to a 100mm bore. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. The SAI uses current AirTAC switches for the magnet.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X86S
- ✓ 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 SI125X86S FAQ
Yes, the SI125X86S is discontinued. The direct replacement is the SAI125X86S. It shares the identical ISO 15552 mounting interface, 125mm bore, 86mm stroke, output force, and G1/2 port, fitting directly into existing fixtures.
The G1/2 port bore delivers 6136N push and 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N at 0.9MPa, and a max of 1251kgf at 1.0MPa. Speed is 30-500mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X86S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X86S replacement — usually within 7-8 hours.