This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX110S, 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 SI125BX110S
The AirTAC SI125 Standard Cylinder SI125BX110S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 110mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX110S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke110 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX110S
- 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 SI125BX110S
The AirTAC SI125BX110S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore, 110 mm stroke, and a SUS304 stainless steel piston rod. It delivers 6136 N push force at 0.5 MPa. The direct replacement is the SAI125BX110S, retaining the same G1/2 port, M27x2 thread, and mounting interface.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. For higher temperatures, a Viton H seal extends operation to 150 C.
Airtac SI125 Standard Cylinder SI125BX110S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX110S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX110S |
| Bore size | Ø125 mm |
| Stroke | 110 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 SAI125BX110S 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 SAI125BX110S 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 SI125BX110S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×110 | 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 SI125BX110S Is Used
Heavy Press Clamping
Secures large metal castings during machining operations, utilizing the 6136 N push force to maintain rigid, zero-movement clamping under heavy cutting loads.
Bulk Material Diversion
Actuates heavy-duty deflector gates on high-capacity conveyor lines, relying on the robust 32 mm SUS304 rod to withstand repeated lateral impacts.
Replacing the Airtac SI125 Standard Cylinder SI125BX110S with the SAI125BX110S
To replace the SI125BX110S, order the SAI125BX110S, ensuring the ISO 15552 mounting interface, 110 mm stroke, G1/2 port, and magnet are retained. The -B rod is SUS304 stainless steel; use the default carbon steel if corrosion resistance is unnecessary. If sizing down, a 100 mm bore yields 3927 N at 0.5 MPa; if sizing up, a 160 mm bore gives 10053 N. The standard cushion is 40 mm. Because this is a 110 mm stroke, side-load risks are low, but always guide the load. A plain cylinder drifts without live air; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants. The -S magnet supports CS1-B/DS1-B switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX110S
- ✓ 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 SI125BX110S FAQ
Yes, the SI125BX110S is discontinued. The direct replacement is the SAI125BX110S. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 110 mm stroke, G1/2 port, and mounting accessories exactly.
This double-acting cylinder has a G1/2 port. It generates 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N push at 0.9 MPa, and a theoretical max of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX110S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX110S replacement — usually within 7-8 hours.