This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX950, 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 SI125AX950
The AirTAC SI125 Standard Cylinder SI125AX950 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 950mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX950, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke950 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX950
- 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 SI125AX950
The AirTAC SI125AX950 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 950 mm stroke. Delivering 6136 N push force at 0.5 MPa, it features a SUS420J2 stainless steel rod, M27x2 thread, G1/2 port, and 40 mm cushions. The direct replacement is the SAI125AX950, matching the bore, stroke, force, port, and ISO 15552 mounting interface.
This SKU lacks a magnet and cannot take a sensor. The SAI upgrade uses two Y-shaped piston seals for low start-up pressure and adds SAIL/BSAI lock variants. At 950 mm, use external guides to prevent rod bending.
Airtac SI125 Standard Cylinder SI125AX950 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX950 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX950 |
| Bore size | Ø125 mm |
| Stroke | 950 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 SAI125AX950 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 SAI125AX950 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 SI125AX950
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×950 | 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 SI125AX950 Is Used
Heavy Stamping
Drives large presses with 6136 N push force at 0.5 MPa, utilizing the 950 mm stroke for deep-draw operations.
Large Gate Actuation
Actuates industrial-sized gates and diverters where the 950 mm travel and robust 125 mm bore are required for moving substantial masses.
Replacing the Airtac SI125 Standard Cylinder SI125AX950 with the SAI125AX950
To replace the SI125AX950, order the SAI125AX950, matching the ISO 15552 mounting interface, 125 mm bore, 950 mm stroke, G1/2 port, and SUS420J2 rod. Neighbouring bores: the 100 mm bore yields 3927 N push @0.5 MPa, while the 160 mm bore yields 10053 N. This non-magnet SKU cannot support CS1-B/DS1-B sensors. For load holding, note that the cushion only decelerates; use an external rod lock, pilot check valve, or SAIL/BSAI variant. At 950 mm, external guides are critical to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX950
- ✓ 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 SI125AX950 FAQ
Yes, the SI125AX950 is discontinued. The direct replacement is the SAI125AX950. It features the same ISO 15552 mounting interface, 125 mm bore, 950 mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly.
It has a G1/2 air port. 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. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX950
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX950 replacement — usually within 7-8 hours.