This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX600S, 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 SI125BX600S
The AirTAC SI125 Standard Cylinder SI125BX600S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 600mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX600S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke600 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX600S
- 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 SI125BX600S
The AirTAC SI125BX600S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore, 600 mm stroke, and a SUS304 stainless steel rod. Delivering 6136 N push force at 0.5 MPa, it is replaced by the SAI125BX600S. This direct upgrade shares the exact ISO 15552 mounting interface, G1/2 port, and 1251 kgf max force.
The SAI features an upgraded piston seal with two Y-shaped elements for low start-up pressure. It retains the magnet for CS1-B/DS1-B switches. For load holding, use SAIL or BSAI variants, as cushions only decelerate.
Airtac SI125 Standard Cylinder SI125BX600S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX600S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX600S |
| Bore size | Ø125 mm |
| Stroke | 600 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 SAI125BX600S 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 SAI125BX600S 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 SI125BX600S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×600 | 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 SI125BX600S Is Used
Heavy Press Forming
Applies the 8590 N push at 0.7 MPa for forming and stamping dense materials within large automated fabrication cells.
Pallet Lift Stations
Drives 600 mm vertical lifting of heavy pallets, utilizing the SUS304 rod for corrosion resistance in humid logistics hubs.
Bulk Material Diversion
Actuates heavy-duty diverter gates on high-throughput packaging lines, requiring the 125 mm bore's 1251 kgf peak capacity.
Replacing the Airtac SI125 Standard Cylinder SI125BX600S with the SAI125BX600S
To replace the SI125BX600S, order the SAI125BX600S direct. Confirm the ISO 15552 mounting interface, G1/2 port, M27x2 thread, and the -S magnet for legacy CS1-B/DS1-B sensors. The SAI family adds SAIL lock, SAIF valve, and BSAI clamp-lock variants. Sizing both ways: a 100 mm bore yields 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. For the 600 mm stroke, use external guides to prevent rod bending and side loads. A plain cylinder drifts on air loss; for load holding, use an external rod lock or pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX600S
- ✓ 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 SI125BX600S FAQ
Yes, the SI125BX600S is discontinued. The direct replacement is the SAI125BX600S. It shares the same ISO 15552 mounting interface, 125 mm bore, 600 mm stroke, G1/2 port, and output force, fitting existing fixtures perfectly.
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 1251 kgf maximum at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX600S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX600S replacement — usually within 7-8 hours.