This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X10S, 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 SI125X10S
The AirTAC SI125 Standard Cylinder SI125X10S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 10mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X10S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke10 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X10S
- 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 SI125X10S
The AirTAC SI125X10S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 10 mm stroke, delivering 6136 N push force at 0.5 MPa. It features a G1/2 port, M27x2 rod thread, and a built-in piston magnet for CS1-B/DS1-B switches. AirTAC replaced this legacy unit with the SAI125X10S.
The SAI125X10S is a direct replacement retaining the exact ISO 15552 mounting interface, bore, stroke, force, and port size. The upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. For load-holding, note that a plain cylinder drifts without live air; use the SAIL or BSAI lock variants, or an external pilot check valve.
Airtac SI125 Standard Cylinder SI125X10S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X10S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X10S |
| Bore size | Ø125 mm |
| Stroke | 10 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 SAI125X10S 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 SAI125X10S 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 SI125X10S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×10 | 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 SI125X10S Is Used
Heavy Stamping
Provides the high 6136 N push force at 0.5 MPa needed to actuate large stamping presses and form rigid metal components.
Pallet Diversion
Short 10 mm stroke delivers rapid, heavy-duty plunger action to divert loaded pallets on high-throughput packaging lines.
Clamp Actuation
Drives robust clamping mechanisms securing heavy fixtures or workpieces, utilizing the 5734 N pull force for reliable holding.
Replacing the Airtac SI125 Standard Cylinder SI125X10S with the SAI125X10S
To replace the SI125X10S, order the SAI125X10S and confirm the ISO 15552 interface, 125 mm bore, 10 mm stroke, G1/2 port (PT/G/NPT thread), and mounting accessory. The -S magnet enables CS1-B/DS1-B sensors, though the SAI family uses current AirTAC switches. Sizing both ways: the 125 mm bore yields 6136 N push at 0.5 MPa (8590 N at 0.7 MPa), while the neighboring 100 mm bore offers 3927 N. For any stroke >= 300 mm, add external guides to mitigate rod-bending side loads. Because air cushions only decelerate, select the SAIL or BSAI lock variant if you need to hold a load securely during air loss.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X10S
- ✓ 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 SI125X10S FAQ
Yes, the SI125X10S is discontinued. The direct replacement is the SAI125X10S. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 10 mm stroke, 6136 N force, G1/2 port, and mounting fixtures.
At 0.5 MPa it provides 6136 N push and 5734 N pull. At 0.7 MPa push is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical max force is 1251 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa, speed is 30-500 mm/s, and it uses a G1/2 port.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X10S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X10S replacement — usually within 7-8 hours.