This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX100S, 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 SI125BX100S
The AirTAC SI125 Standard Cylinder SI125BX100S 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 SAI125BX100S, 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 → SAI125BX100S
- 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 SI125BX100S
The AirTAC SI125BX100S is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 100mm stroke. It delivers 6136N push force at 0.5MPa and features a SUS304 stainless piston rod for corrosion resistance. The direct replacement is the SAI125BX100S, which shares the same G1/2 port, M27x2 thread, and mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL and BSAI lock variants absent in the SI line.
Airtac SI125 Standard Cylinder SI125BX100S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX100S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX100S |
| 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 SAI125BX100S 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 SAI125BX100S 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 SI125BX100S
| 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 SI125BX100S Is Used
Heavy Stamping Press
Drives heavy tooling in automated stamping lines, utilizing the 6136N push force at 0.5MPa to form thick gauge materials reliably.
Large Clamp Fixture
Secures oversized composite molds during curing, relying on the SUS304 stainless rod to resist moisture and corrosion.
Replacing the Airtac SI125 Standard Cylinder SI125BX100S with the SAI125BX100S
To replace the SI125BX100S, order the SAI125BX100S. Verify the ISO 15552 mounting interface, 100mm stroke, G1/2 port, and the -S magnet for CS1-B/DS1-B sensors. If downsizing, a 100mm bore yields 3927N at 0.5MPa; if upsizing, a 160mm bore yields 10053N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for holding. The SAI upgrade uses an improved seal and adds SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX100S
- ✓ 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 SI125BX100S FAQ
Yes, the SI125BX100S is discontinued. The direct replacement is the SAI125BX100S. It is dimensionally interchangeable per ISO 15552, matching the 125mm bore, 100mm stroke, G1/2 port, and mounting fixtures.
The bore is 125mm with a G1/2 port. Force output is 6136N push and 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N push at 0.9MPa, and a theoretical max of 1251 kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX100S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX100S replacement — usually within 7-8 hours.