This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX80S, 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 SI125BX80S
The AirTAC SI125 Standard Cylinder SI125BX80S 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 SAI125BX80S, 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 → SAI125BX80S
- 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 SI125BX80S
The AirTAC SI125BX80S is a discontinued double-acting ISO 15552 profile cylinder featuring a 125 mm bore and 80 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125BX80S, matching the original ISO 15552 mounting interface, bore, stroke, output force, and port size. This B-suffix variant specifies a SUS304 stainless piston rod for corrosion resistance instead of standard carbon steel.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL lock, SAIF valve, and BSAI clamp-lock variants absent in the SI line.
Airtac SI125 Standard Cylinder SI125BX80S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX80S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX80S |
| 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 SAI125BX80S 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 SAI125BX80S 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 SI125BX80S
| 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 SI125BX80S Is Used
Heavy Press Clamping
Secures large metal castings in machining centers using the 6136 N push force, with the SUS304 rod resisting coolant corrosion.
Pallet Stopper Gate
Acts as a robust 80 mm stroke stop gate on heavy-duty roller conveyors, leveraging the 125 mm bore's 5734 N pull force.
Injection Mold Ejector
Drives heavy mold ejection plates where the 313 kg vertical lift capacity at 0.5 MPa easily overcomes initial static friction.
Replacing the Airtac SI125 Standard Cylinder SI125BX80S with the SAI125BX80S
To replace the SI125BX80S, order the SAI125BX80S and verify the ISO 15552 mounting interface, 80 mm stroke, G1/2 port (PT/G/NPT thread), and the -S magnet for current AirTAC switches. If downsizing, a 100 mm bore yields 3927 N push at 0.5 MPa; if upsizing, a 160 mm bore provides 10053 N. The SUS304 rod is ideal for moist environments. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX80S
- ✓ 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 SI125BX80S FAQ
Yes, the SI125BX80S is discontinued. The direct replacement is the SAI125BX80S. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 80 mm stroke, 6136 N force, G1/2 port, and mounting fixtures.
It features a G1/2 air port and delivers 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N at 0.9 MPa, and a maximum theoretical force of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX80S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX80S replacement — usually within 7-8 hours.