This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X500, 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 SI125X500
The AirTAC SI125 Standard Cylinder SI125X500 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 500mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X500, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X500
- 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 SI125X500
The AirTAC SI125X500 is a discontinued double-acting ISO 15552 profile cylinder delivering 6136 N push force at 0.5 MPa through a 125 mm bore and 500 mm stroke. It is replaced by the SAI125X500, a direct upgrade retaining the exact ISO 15552 mounting interface, G1/2 port, and M27x2 rod thread.
The SAI125X500 features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this non-magnet SKU cannot take a sensor, and the SAI family adds SAIL lock and BSAI clamp variants absent in the SI line.
Airtac SI125 Standard Cylinder SI125X500 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X500 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X500 |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAI125X500 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 SAI125X500 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 SI125X500
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SI125X500 Is Used
Heavy Pressing
Drives 6136 N at 0.5 MPa for seating large bearings and heavy structural assemblies in automated fabrication lines.
Pallet Handling
Moves heavy loaded pallets over 500 mm strokes in distribution hubs, requiring external guides to prevent rod bending.
Injection Moulding
Actuates substantial mould halves and clamping fixtures where the 125 mm bore provides the necessary holding thrust.
Replacing the Airtac SI125 Standard Cylinder SI125X500 with the SAI125X500
To replace the SI125X500, order the SAI125X500 ensuring the ISO 15552 interface, 500 mm stroke, G1/2 port, and mounting accessory match. This non-S SKU lacks a magnet and cannot accept CS1-B/DS1-B sensors. For sizing, the 100 mm bore yields 3927 N push at 0.5 MPa, while the 160 mm bore yields 10053 N. The cushion only decelerates; use the SAIL lock or an external pilot check valve to hold loads. At 500 mm, prevent rod bending by guiding the load externally.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X500
- ✓ 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 SI125X500 FAQ
Yes, the SI125X500 is discontinued. The direct replacement is the SAI125X500, which shares the identical ISO 15552 mounting interface, 125 mm bore, 500 mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly.
It features a G1/2 port and delivers 6136 N push / 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N at 0.9 MPa, and a theoretical max of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X500
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X500 replacement — usually within 7-8 hours.