This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX190S, 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 SI125BX190S
The AirTAC SI125 Standard Cylinder SI125BX190S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 190mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX190S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke190 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX190S
- 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 SI125BX190S
The AirTAC SI125BX190S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore, 190 mm stroke, and a SUS304 stainless steel piston rod. It delivers 6136 N push force at 0.5 MPa. The direct replacement is the SAI125BX190S, matching the exact bore, stroke, G1/2 port, and ISO 15552 mounting interface.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL and BSAI lock variants the SI lacked.
Airtac SI125 Standard Cylinder SI125BX190S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX190S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX190S |
| Bore size | Ø125 mm |
| Stroke | 190 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 SAI125BX190S 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 SAI125BX190S 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 SI125BX190S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×190 | 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 SI125BX190S Is Used
Heavy Stamping Press
Drives heavy-duty stamping actuators where the 6136 N push force at 0.5 MPa and robust SUS304 rod handle high-impact tooling.
Large Clamp Fixture
Secures large fabricated components during machining, using the G1/2 port for rapid actuation and adjustable 40 mm cushions.
Replacing the Airtac SI125 Standard Cylinder SI125BX190S with the SAI125BX190S
To replace the SI125BX190S, order the SAI125BX190S. Confirm the ISO 15552 mounting interface, 190 mm stroke, G1/2 port, and mounting accessory. The -B rod is SUS304 stainless steel, and the -S magnet requires CS1-B/DS1-B switches (the SAI uses current AirTAC switches). For sizing, a 100 mm bore yields 3927 N at 0.5 MPa, while a 160 mm bore yields 10053 N. A plain cylinder drifts on air loss; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 190 mm stroke, side-load and rod-bending risks are low, but ensure guide alignment to protect the 32 mm rod.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX190S
- ✓ 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 SI125BX190S FAQ
Yes, the SI125BX190S is discontinued. The direct replacement is the SAI125BX190S. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 190 mm stroke, G1/2 port, and mounting interface.
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 SAI125BX190S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX190S replacement — usually within 7-8 hours.