This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX220S, 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 SI125BX220S
The AirTAC SI125 Standard Cylinder SI125BX220S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 220mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX220S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke220 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX220S
- 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 SI125BX220S
The AirTAC SI125BX220S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 220 mm stroke. Featuring a SUS304 stainless steel rod and an integrated magnet for CS1-B/DS1-B sensors, it delivers 6136 N push force at 0.5 MPa via a G1/2 port. AirTAC replaced this legacy unit with the SAI125BX220S, a direct alternative retaining the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI upgrade introduces a two-piece Y-shaped piston seal for lower start-up pressure and extended life, while operating at 30-500 mm/s. The broader SAI family also adds SAIL, SAIF, and BSAI lock variants absent in the SI line.
Airtac SI125 Standard Cylinder SI125BX220S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX220S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX220S |
| Bore size | Ø125 mm |
| Stroke | 220 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 SAI125BX220S 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 SAI125BX220S 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 SI125BX220S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×220 | 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 SI125BX220S Is Used
Heavy-Duty Pressing
Drives robust stamping and forming operations requiring up to 8590 N of thrust at 0.7 MPa, utilizing the adjustable 40 mm air cushions to absorb end-of-stroke impact.
Corrosive Environment Actuation
The SUS304 stainless steel piston rod (-B option) provides essential corrosion resistance for washdown zones or chemical manufacturing facilities.
Replacing the Airtac SI125 Standard Cylinder SI125BX220S with the SAI125BX220S
To replace the SI125BX220S, order the SAI125BX220S. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the 220 mm stroke, G1/2 port threads, and the -S magnet for legacy CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). If you need more force than the 6136 N at 0.5 MPa, step up to a 160 mm bore; if less is required, a 100 mm bore provides 3927 N. Note that a plain cylinder drifts without live air—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding. At 220 mm stroke, side-load risks are low, but always ensure proper guide alignment to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX220S
- ✓ 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 SI125BX220S FAQ
Yes, the SI125BX220S is discontinued. The direct replacement is the SAI125BX220S. It shares the identical ISO 15552 mounting interface, 125 mm bore, 220 mm stroke, output force, G1/2 port, and accessories, fitting directly into your existing fixtures.
It features a G1/2 air port and an M27x2 rod thread. 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, with a theoretical maximum of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX220S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX220S replacement — usually within 7-8 hours.