This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX80, 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 SI125BX80
The AirTAC Airtac SI125 Standard Cylinder SI125BX80 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 SAI125BX80, 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 → SAI125BX80
- 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 SI125BX80
The AirTAC SI125BX80 is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel and an 80 mm stroke. Delivering 6136 N push force at 0.5 MPa, it features a SUS304 stainless piston rod for corrosion resistance. Because this SKU lacks a magnet, it cannot accept a position switch.
You must order the direct replacement SAI125BX80. It shares the exact ISO 15552 mounting interface, G1/2 port, and 125 mm bore. The SAI upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure.
Airtac SI125 Standard Cylinder SI125BX80 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX80 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX80 |
| 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 SAI125BX80 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 SAI125BX80 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 SI125BX80
| 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 SI125BX80 Is Used
Heavy Press Clamping
Generates 6136 N of push force at 0.5 MPa to secure heavy steel plates during machining or welding operations.
Pallet Lift Gates
The SUS304 stainless rod resists moisture in logistics hubs while actuating 80 mm stroke loading dock gates.
Mold Ejection Systems
Provides reliable 5734 N pull force at 0.5 MPa to retract heavy industrial molds within high-temperature production lines.
Replacing the Airtac SI125 Standard Cylinder SI125BX80 with the SAI125BX80
To replace this SI cylinder, order the SAI125BX80. Verify the ISO 15552 mounting accessory, the G1/2 air port, and the 80 mm stroke. This non-magnet SKU cannot take a sensor; legacy CS1-B/DS1-B switches required the -S option. If sizing up or down, note the 100 mm bore offers 3927 N push, while the 160 mm bore provides 10053 N at 0.5 MPa. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants. The SAI family also adds the SAIF self-valve option.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX80
- ✓ 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 SI125BX80 FAQ
Yes, the SI125BX80 is discontinued. The direct replacement is the SAI125BX80. It maintains the exact ISO 15552 mounting interface, 125 mm bore, 80 mm stroke, and G1/2 port, fitting existing fixtures perfectly.
It has a G1/2 port, M27x2 rod thread, and 40 mm cushions. Speed is 30-500 mm/s. Force ratings are: push 6136 N and pull 5734 N at 0.5 MPa, push 8590 N at 0.7 MPa, and a theoretical max of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX80
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX80 replacement — usually within 7-8 hours.