This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX80, 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 SI125AX80
The AirTAC Airtac SI125 Standard Cylinder SI125AX80 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 SAI125AX80, 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 → SAI125AX80
- 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 SI125AX80
The AirTAC SI125AX80 is a discontinued double-acting ISO 15552 profile cylinder with an 80 mm stroke and a 125 mm bore, delivering 6136 N push force at 0.5 MPa. It features a G1/2 port, an M27x2 rod thread, and a 40 mm adjustable air cushion at each end. As an end-of-line product, it is directly superseded by the SAI125AX80 direct replacement, which preserves the exact ISO 15552 mounting interface, bore, stroke, output force, and port size for seamless fixture integration.
The SAI upgrade incorporates an advanced piston seal utilizing two Y-shaped one-way elements for extended lifespan and low start-up pressure. This specific SKU uses the SUS420J2 stainless steel piston rod (the -A option) for corrosion resistance, but lacks a magnet, meaning it cannot accept position sensors. For applications requiring load holding on air loss, note that the cushion only decelerates; you would need the SAIL or BSAI lock variants or an external pilot check valve.
Airtac SI125 Standard Cylinder SI125AX80 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX80 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX80 |
| 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 SAI125AX80 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 SAI125AX80 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 SI125AX80
| 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 SI125AX80 Is Used
Heavy Stamping Press
Drives robust stamping actions where the 6136 N push force at 0.5 MPa easily overcomes sheet metal resistance and die friction.
Pallet Squaring Unit
Uses the short 80 mm stroke to rapidly square and align heavy inbound pallets before stretch wrapping without occupying floor space.
Injection Mold Ejection
Leverages the SUS420J2 stainless rod to eject humid or chemically exposed plastic parts reliably in high-humidity molding bays.
Replacing the Airtac SI125 Standard Cylinder SI125AX80 with the SAI125AX80
To replace the discontinued SI125AX80, order the SAI125AX80, confirming the ISO 15552 mounting interface, 125 mm bore, 80 mm stroke, and G1/2 port. Specify the -A rod material for the SUS420J2 stainless steel rod, and note that because this SKU lacks a -S magnet, it cannot support legacy CS1-B/DS1-B sensors. When sizing, the 125 mm bore yields 6136 N push at 0.5 MPa; if you need less force, the neighbouring 100 mm bore offers 3927 N push, while the 160 mm bore provides 10053 N for heavier demands. Because this plain cylinder does not hold load without live air, use an external rod lock or pilot check valve for safety, or explore the SAI family's SAIL air-released lock or BSAI clamp-lock variants. Since the 80 mm stroke is under 300 mm, side-load rod-bending risks are minimal, but standard guide considerations still apply.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX80
- ✓ 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 SI125AX80 FAQ
Yes, the AirTAC SI125AX80 is discontinued. The direct replacement is the SAI125AX80. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 125 mm bore, 80 mm stroke, output force, and G1/2 port, so it fits existing fixtures perfectly.
The 125 mm bore generates a push force of 6136 N and a pull force of 5734 N at 0.5 MPa. At 0.7 MPa it pushes 8590 N, and 11045 N at 0.9 MPa, with a theoretical max of 1251 kgf at 1.0 MPa. The operating speed range is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX80
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX80 replacement — usually within 7-8 hours.