This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X80N, 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 SI125X80N
The AirTAC SI125 Standard Cylinder SI125X80N is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 80mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X80N, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke80 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X80N
- 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 SI125X80N
The AirTAC SI125X80N is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel. It delivers 6136 N push force at 0.5 MPa. This NBR-sealed (-N) unit lacks a magnet (-S), so it cannot accept legacy CS1-B/DS1-B sensors.
Order the direct replacement SAI125X80N instead. It shares the exact ISO 15552 mounting interface, 80 mm stroke, G1/2 port, and 1251 kgf max force. The SAI upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure.
Airtac SI125 Standard Cylinder SI125X80N Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X80N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X80N |
| Bore size | Ø125 mm |
| Stroke | 80 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 SAI125X80N 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 SAI125X80N 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 SI125X80N
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×80 | 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 SI125X80N Is Used
Heavy Stamping
Drives large presses and stamping fixtures requiring 6136 N push force at 0.5 MPa with a stable 125 mm bore.
Pallet Handling
Indexes heavy pallets over an 80 mm stroke, relying on the 40 mm adjustable air cushions to decelerate loads safely.
Replacing the Airtac SI125 Standard Cylinder SI125X80N with the SAI125X80N
To replace the SI125X80N, order the SAI125X80N. Verify the ISO 15552 mounting interface, G1/2 port, and 80 mm stroke. Because this SKU lacks a magnet, it cannot use CS1-B/DS1-B sensors; order an -S suffix if position detection is needed. The SAI family adds SAIL and BSAI lock variants for load holding, as a plain cylinder drifts without live air. For sizing, neighboring bores (100/160) offer different forces (3927 N / 10053 N at 0.5 MPa). The 32 mm rod and M27x2 thread handle high thrust. Speed is 30-500 mm/s. The NBR seal suits -20 to +70 C; choose Viton H for up to 150 C.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X80N
- ✓ 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 SI125X80N FAQ
Yes, the SI125X80N is discontinued. The direct replacement is the SAI125X80N. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 80 mm stroke, G1/2 port, and mounting accessories.
The G1/2 ported 125 mm bore delivers 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, and a theoretical max of 1251 kgf at 1.0 MPa. It uses a 32 mm rod with an M27x2 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X80N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X80N replacement — usually within 7-8 hours.