This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX950, 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 SI125BX950
The AirTAC SI125 Standard Cylinder SI125BX950 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 SAI125BX950, 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 → SAI125BX950
- 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 SI125BX950
The AirTAC SI125BX950 is a discontinued double-acting ISO 15552 profile cylinder featuring a SUS304 stainless steel piston rod and a 950 mm stroke. Delivering 6136 N push force at 0.5 MPa, it is replaced by the SAI125BX950. This direct upgrade shares the exact G1/2 port, M27x2 thread, and mounting interface.
The SAI replacement upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure. Note this non-magnet SKU cannot take a sensor, and plain cylinders drift without air; use SAIL or BSAI lock variants to hold loads.
Airtac SI125 Standard Cylinder SI125BX950 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX950 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX950 |
| 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 SAI125BX950 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 SAI125BX950 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 SI125BX950
| 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 SI125BX950 Is Used
Heavy Material Lifts
Drives large platform elevators and heavy bulk material gates using its 6136 N push force at 0.5 MPa, with the SUS304 rod resisting corrosive washdowns.
Large Press Actuation
Actuates heavy-duty forming presses and stamping fixtures, utilizing the 950 mm long stroke to fully open and close large tooling dies.
Replacing the Airtac SI125 Standard Cylinder SI125BX950 with the SAI125BX950
To replace the SI125BX950, order the SAI125BX950. Verify the ISO 15552 mounting interface, 125 mm bore, 950 mm stroke, G1/2 port, and SUS304 rod. Because this SKU lacks a magnet (-S), it cannot accept CS1-B/DS1-B sensors. If you need load holding on air loss, a plain cylinder drifts—use an external pilot check valve or the SAIL/BSAI lock variants. At 950 mm, prevent rod bending by adding external guides to manage side loads. For lower force, a 100 mm bore gives 3927 N push; for more, a 160 mm bore yields 10053 N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX950
- ✓ 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 SI125BX950 FAQ
Yes, the SI125BX950 is discontinued. The direct replacement is the SAI125BX950. It shares the identical ISO 15552 mounting interface, 125 mm bore, 950 mm stroke, force, and G1/2 port, fitting existing fixtures perfectly.
It features a G1/2 port. 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 maximum theoretical force of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX950
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX950 replacement — usually within 7-8 hours.