This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX950S, 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 SI125BX950S
The AirTAC SI125 Standard Cylinder SI125BX950S 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 SAI125BX950S, 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 → SAI125BX950S
- 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 SI125BX950S
The AirTAC SI125BX950S is a discontinued double-acting ISO 15552 profile cylinder featuring a SUS304 stainless steel piston rod and a 950 mm stroke. It delivers 6136 N push force at 0.5 MPa through its G1/2 port. The direct replacement is the SAI125BX950S, matching the exact 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 longevity. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI uses current switches. A plain cylinder drifts without live air; use the SAIL or BSAI lock variant for load holding.
Airtac SI125 Standard Cylinder SI125BX950S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX950S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX950S |
| 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 SAI125BX950S 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 SAI125BX950S 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 SI125BX950S
| 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 SI125BX950S Is Used
Heavy Press Ejection
Drives large stamping press ejectors, utilizing the 6136 N push force to reliably clear heavy metal blanks from deep dies.
Pallet Dispenser
Actuates automated pallet dispensing magazines, where the 950 mm stroke separates and feeds empty pallets into high-bay lines.
Material Lift Lowering
Lowers heavy material lifts in assembly zones, requiring external guides to prevent rod bending across the 950 mm extension.
Replacing the Airtac SI125 Standard Cylinder SI125BX950S with the SAI125BX950S
To replace the SI125BX950S, order the SAI125BX950S. Verify the ISO 15552 mounting interface, 125 mm bore, 950 mm stroke, G1/2 port, M27x2 thread, and -S magnet. The SUS304 (-B) rod is standard here. Sizing both ways: the 125 mm bore yields 6136 N push at 0.5 MPa (8590 N at 0.7), while the adjacent 100 mm bore offers 3927 N. For load holding on air loss, the cushion only decelerates; add an external pilot check valve or use the SAIL/BSAI lock variants. At 950 mm, prevent rod bending with external guides to manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX950S
- ✓ 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 SI125BX950S FAQ
Yes, the SI125BX950S is discontinued. The direct replacement is the SAI125BX950S. It is dimensionally interchangeable per ISO 15552, retaining the same bore, stroke, force, G1/2 port, and mounting interface.
It features a G1/2 port. The 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 maximum theoretical force of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX950S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX950S replacement — usually within 7-8 hours.