This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX190S, 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 SI125AX190S
The AirTAC SI125 Standard Cylinder SI125AX190S 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 SAI125AX190S, 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 → SAI125AX190S
- 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 SI125AX190S
The AirTAC SI125AX190S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 190 mm stroke. Featuring a SUS420J2 stainless piston rod and a built-in magnet for legacy CS1-B/DS1-B switches, it delivers 6136 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the current-production SAI125AX190S, matching the bore, stroke, force, port and ISO 15552 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, SAIF and BSAI lock variants the SI lacked.
Airtac SI125 Standard Cylinder SI125AX190S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX190S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX190S |
| 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 SAI125AX190S 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 SAI125AX190S 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 SI125AX190S
| 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 SI125AX190S Is Used
Heavy-Duty Pressing
Drives large stamping or forming dies requiring 6136 N of push force at 0.5 MPa with stable 190 mm travel.
Automated Clamp Systems
Secures heavy workpieces on machining lines, using the 125 mm bore's robust 5734 N pull force for reliable holding.
Replacing the Airtac SI125 Standard Cylinder SI125AX190S with the SAI125AX190S
To replace the SI125AX190S, order the SAI125AX190S. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the 190 mm stroke, the G1/2 port, and the -S magnet for current AirTAC switches. If you need higher force, the neighbouring 160 mm bore provides 10053 N push at 0.5 MPa; if lower force is acceptable, the 100 mm bore provides 3927 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use a SAIL or BSAI lock variant, or an external pilot check valve, to hold loads. The -A rod denotes the SUS420J2 stainless option over standard carbon steel.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX190S
- ✓ 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 SI125AX190S FAQ
Yes, the AirTAC SI125AX190S is discontinued. The direct replacement is the SAI125AX190S. It features the same ISO 15552 mounting interface, 125 mm bore, 190 mm stroke, output force, G1/2 port, and -S magnet, fitting directly into existing fixtures.
This double-acting cylinder uses a G1/2 air port and operates at 30-500 mm/s. The thrust ratings are: 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 maximum of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX190S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX190S replacement — usually within 7-8 hours.