This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X80H, 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 SI125X80H
The AirTAC SI125 Standard Cylinder SI125X80H 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 SAI125X80H, 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 → SAI125X80H
- 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 SI125X80H
The AirTAC SI125X80H is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel. Built for high-temperature duty via its Viton H seals (operating up to 150 C), it delivers 6136 N push and 5734 N pull at 0.5 MPa through a G1/2 port. AirTAC replaced this EOL unit with the SAI125X80H.
The SAI125X80H is a direct replacement sharing the exact ISO 15552 mounting interface, 80 mm stroke, M27x2 rod thread, and force class. It upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. Note this non-S SKU lacks a magnet and cannot accept a sensor.
Airtac SI125 Standard Cylinder SI125X80H Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X80H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X80H |
| 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 SAI125X80H 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 SAI125X80H 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 SI125X80H
| 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 SI125X80H Is Used
Hot Stamp Presses
Drives heavy platens in high-temp stamping cells where the Viton H seal survives ambient heat that degrades standard NBR cups.
Aluminum Extrusion Handling
Pushes or clamps 300+ kg billet profiles at 0.5 MPa, utilizing the 6136 N thrust and robust 32 mm rod for rigid actuation.
Pallet Stopper Gates
Acts as a high-force stop or diverter in conveyor systems, absorbing kinetic energy via its 40 mm adjustable air cushions.
Replacing the Airtac SI125 Standard Cylinder SI125X80H with the SAI125X80H
To replace this discontinued SI125X80H, order the SAI125X80H. Verify your ISO 15552 mounting accessory (LB, FA, CA, TC, etc.), the G1/2 port, and the M27x2 rod thread. Because this is a non-S variant, it has no magnet and cannot support CS1-B/DS1-B switches; if you need position sensing, select an SAI equivalent with the -S suffix. For sizing, the 125 mm bore yields 6136 N push at 0.5 MPa; if you need less force, step down to a 100 mm bore (3927 N), or step up to 160 mm (10053 N) for heavier loads. This cylinder operates at 30-500 mm/s. Remember, a standard cylinder drifts on air loss—the cushion only decelerates near stroke end. For load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X80H
- ✓ 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 SI125X80H FAQ
Yes, the SI125X80H is discontinued. The direct replacement is the AirTAC SAI125X80H. It shares the identical ISO 15552 mounting interface, 125 mm bore, 80 mm stroke, G1/2 port, and force output, fitting directly into existing fixtures.
The G1/2 port feeds a 32 mm rod yielding 6136 N push and 5734 N pull at 0.5 MPa. At 0.7 MPa push is 8590 N, and 11045 N at 0.9 MPa. The theoretical max is 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X80H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X80H replacement — usually within 7-8 hours.