This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX140S, 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 SI125AX140S
The AirTAC SI125 Standard Cylinder SI125AX140S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 140mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX140S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX140S
- 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 SI125AX140S
The AirTAC SI125AX140S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore, 140 mm stroke, and a SUS420J2 stainless steel rod. Delivering 6136 N push force at 0.5 MPa, it is replaced by the SAI125AX140S. This direct upgrade keeps the same ISO 15552 mounting interface, G1/2 port, and M27x2 rod thread, fitting existing fixtures perfectly.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. The -S magnet works with legacy CS1-B/DS1-B sensors. For load holding, note the cushion only decelerates; use SAIL or BSAI lock variants.
Airtac SI125 Standard Cylinder SI125AX140S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX140S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX140S |
| Bore size | Ø125 mm |
| Stroke | 140 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 SAI125AX140S 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 SAI125AX140S 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 SI125AX140S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×140 | 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 SI125AX140S Is Used
Heavy Stamping Press
Drives heavy-duty stamping and forming dies requiring 6136 N push force at 0.5 MPa with stable 140 mm travel.
Injection Mold Clamp
Secures large injection molding tools, utilizing the SUS420J2 stainless rod for corrosion resistance.
Replacing the Airtac SI125 Standard Cylinder SI125AX140S with the SAI125AX140S
To replace the SI125AX140S, order the SAI125AX140S. It is a direct per ISO 15552 interface dimensions, matching the 125 mm bore, 140 mm stroke, G1/2 port, and M27x2 thread. The -A suffix specifies the SUS420J2 stainless rod, and -S confirms the magnet for CS1-B/DS1-B switches. If sizing up or down, neighboring bores are 100 mm (3927 N [email protected]) and 160 mm (10053 N [email protected]). A plain cylinder drifts without air; for load holding, specify the SAIL or BSAI lock variant, or an external pilot check valve. Since 140 mm is below 300 mm, side-load risks are minimal, but always guide the load.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX140S
- ✓ 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 SI125AX140S FAQ
Yes, the SI125AX140S is discontinued. The direct replacement is the SAI125AX140S. It shares the exact ISO 15552 mounting interface, 125 mm bore, 140 mm stroke, output force, and G1/2 port, so it drops directly into existing fixtures.
It features a G1/2 air port and M27x2 rod thread. Force 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 max of 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX140S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX140S replacement — usually within 7-8 hours.