This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX115, 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 SI125BX115
The AirTAC SI125 Standard Cylinder SI125BX115 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 115mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX115, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke115 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX115
- 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 SI125BX115
The AirTAC SI125BX115 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 115 mm stroke. Delivering 6136 N push and 5734 N pull at 0.5 MPa, it features a G1/2 air port and a SUS304 stainless steel piston rod. AirTAC replaced this legacy unit with the SAI125BX115, a direct sharing the exact ISO 15552 mounting interface, force, port, and stroke.
The SAI125BX115 upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks a magnet so it cannot take a sensor, and the family expands with SAIL, SAIF, and BSAI lock variants.
Airtac SI125 Standard Cylinder SI125BX115 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX115 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX115 |
| Bore size | Ø125 mm |
| Stroke | 115 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 SAI125BX115 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 SAI125BX115 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 SI125BX115
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×115 | 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 SI125BX115 Is Used
Heavy Stamping Press
Drives large platens and heavy dies requiring 6136 N of push force at 0.5 MPa, absorbing end-of-stroke shock with its 40 mm adjustable air cushion.
Pallet Actuation
Shifts loaded pallets in high-throughput logistics lines, where the SUS304 stainless rod prevents corrosion in humid or washdown environments.
Replacing the Airtac SI125 Standard Cylinder SI125BX115 with the SAI125BX115
To replace the SI125BX115, order the SAI125BX115. Confirm your ISO 15552 mounting fixture, the 115 mm stroke, and the G1/2 port (available in PT, G, or NPT). Because this SKU has no -S magnet, it cannot accept a CS1-B or DS1-B sensor; if position detection is needed, select a magnet-equipped SAI. The -B code specifies the SUS304 stainless rod for corrosion resistance instead of standard carbon steel. At 0.5 MPa it yields 6136 N push; sizing down, an 80 mm bore gives 2513 N. Remember, a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX115
- ✓ 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 SI125BX115 FAQ
Yes, the AirTAC SI125BX115 is discontinued. The direct replacement is the SAI125BX115. It shares the identical ISO 15552 mounting interface, 125 mm bore, 115 mm stroke, G1/2 port, and output force, fitting directly into existing fixtures.
This double-acting cylinder delivers 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. Operating speed is 30-500 mm/s, and it uses a G1/2 port.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX115
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX115 replacement — usually within 7-8 hours.