This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX75, 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 SI125BX75
The AirTAC Airtac SI125 Standard Cylinder SI125BX75 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 75mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX75, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke75 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX75
- 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 SI125BX75
The AirTAC SI125BX75 is a discontinued double-acting ISO 15552 profile cylinder featuring a 125mm bore, 75mm stroke, and a SUS304 stainless steel rod. Delivering 6136N push force at 0.5MPa, it is replaced by the SAI125BX75 direct equivalent. This upgrade shares identical ISO 15552 mounting dimensions, G1/2 port, and output force, fitting existing fixtures seamlessly.
The SAI features an upgraded piston seal with two Y-shaped elements for low start-up pressure. Note this SKU lacks a magnet, so CS1-B/DS1-B sensors cannot be used.
Airtac SI125 Standard Cylinder SI125BX75 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX75 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX75 |
| Bore size | Ø125 mm |
| Stroke | 75 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 SAI125BX75 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 SAI125BX75 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 SI125BX75
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×75 | 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 SI125BX75 Is Used
Heavy Pressing
Applies the 6136N thrust at 0.5MPa for seating heavy bearings or forming robust components.
Corrosive Handling
The SUS304 stainless rod excels in damp or washdown environments where carbon steel would rust.
Replacing the Airtac SI125 Standard Cylinder SI125BX75 with the SAI125BX75
To replace the SI125BX75, order the SAI125BX75. Confirm the ISO 15552 mounting interface, 125mm bore, 75mm stroke, G1/2 port, and SUS304 rod. Sizing both ways: a 100mm bore yields 3927N push at 0.5MPa, while a 160mm bore yields 10053N. If you need load holding, plain cylinders drift on air loss—use an external rod lock or pilot check valve. For lock needs, explore the SAIL or BSAI variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX75
- ✓ 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 SI125BX75 FAQ
Yes, the SI125BX75 is discontinued. The direct replacement is the SAI125BX75, offering the same ISO 15552 mounting interface, 125mm bore, 75mm stroke, force, and G1/2 port.
It features a G1/2 port. Force ratings: 6136N push / 5734N pull at 0.5MPa; 8590N push at 0.7MPa; 11045N push at 0.9MPa; max 1251kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX75
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX75 replacement — usually within 7-8 hours.