This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX100N, 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 SI125BX100N
The AirTAC SI125 Standard Cylinder SI125BX100N is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 100mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX100N, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke100 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX100N
- 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 SI125BX100N
The AirTAC SI125BX100N is a discontinued double-acting ISO 15552 profile cylinder featuring a 125mm bore and 100mm stroke. Built with an extruded aluminum barrel, it delivers 6136 N push force at 0.5 MPa. This specific SKU includes a SUS304 stainless steel piston rod (-B) for corrosion resistance and NBR seals (-N) for a -20 to +70 C operating range. It lacks a magnet, so it cannot accept position sensors. The direct replacement is the SAI125BX100N, maintaining the exact same ISO 15552 mounting interface, G1/2 port, and output force.
The SAI upgrade introduces an advanced piston seal with two Y-shaped one-way elements, ensuring low start-up pressure and extended service life. The SAI family also expands functionality with SAIL air-released lock, BSAI clamp-lock, and SAIF built-in valve variants that the legacy SI line lacked.
Airtac SI125 Standard Cylinder SI125BX100N Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX100N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX100N |
| Bore size | Ø125 mm |
| Stroke | 100 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 SAI125BX100N 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 SAI125BX100N 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 SI125BX100N
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×100 | 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 SI125BX100N Is Used
Heavy-Duty Pressing
Drives large stamping and forming operations requiring up to 11045 N of thrust at 0.9 MPa, utilizing the robust 32mm piston rod.
Pallet Handling
Actuates heavy pallet lifts and stops in high-throughput logistics, safely moving loads near the 313 kg vertical lift threshold.
Corrosive Environments
Ideal for washdown or chemical processing zones thanks to the SUS304 stainless steel rod, preventing rust on the actuator core.
Replacing the Airtac SI125 Standard Cylinder SI125BX100N with the SAI125BX100N
To replace the discontinued SI125BX100N, order the SAI125BX100N. Verify your existing fixture's ISO 15552 mounting interface dimensions, the 100mm stroke, and the G1/2 air port. Because this SKU lacks the -S magnet suffix, it cannot support legacy CS1-B/DS1-B sensors; if position detection is needed, upgrade to an SAI model with the magnet option and current AirTAC switches. When sizing, note that a neighboring 100mm bore provides 3927 N push at 0.5 MPa, while a 160mm bore yields 10053 N. Keep in mind a standard cylinder does not hold load without live air—the cushion only decelerates. For load holding on air loss, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants. The 32mm rod and M27x2 thread must match your mechanical linkage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX100N
- ✓ 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 SI125BX100N FAQ
Yes, the SI125BX100N is discontinued. The direct replacement is the SAI125BX100N. It is dimensionally interchangeable per ISO 15552, matching the 125mm bore, 100mm stroke, G1/2 port, and mounting accessories. The SAI features an upgraded piston seal for longer life.
The G1/2 port is fixed by the 125mm bore. Force output is 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. It operates at 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX100N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX100N replacement — usually within 7-8 hours.