This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX75CA, 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 SI125BX75CA
The AirTAC Airtac SI125 Standard Cylinder SI125BX75CA 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 SAI125BX75CA, 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 → SAI125BX75CA
- 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 SI125BX75CA
The AirTAC SI125BX75CA is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 75 mm stroke. It delivers 6136 N push and 5734 N pull at 0.5 MPa, with a G1/2 port and M27x2 rod thread. The direct replacement is the SAI125BX75CA, which shares the exact ISO 15552 mounting interface, CA clevis, and force ratings.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This specific SKU uses a SUS304 stainless steel rod (-B) and lacks a magnet, so it cannot accept position sensors.
Airtac SI125 Standard Cylinder SI125BX75CA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX75CA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX75CA |
| 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 SAI125BX75CA 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 SAI125BX75CA 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 SI125BX75CA
| 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 SI125BX75CA Is Used
Heavy Press Clamping
Applies 6136 N of clamping force at 0.5 MPa to secure heavy steel plates during machining operations.
Stamping Ejector
Ejects heavy stamped metal parts from press dies using the robust 32 mm SUS304 stainless rod.
Replacing the Airtac SI125 Standard Cylinder SI125BX75CA with the SAI125BX75CA
To replace the SI125BX75CA, order the SAI125BX75CA. Verify the ISO 15552 CA clevis mounting, 75 mm stroke, and G1/2 port. Because this is a no-magnet SKU, it cannot use CS1-B/DS1-B sensors; add an -S suffix to the SAI order if sensing is needed. This 125 mm bore outputs 6136 N at 0.5 MPa; if less force is required, an 80 mm bore gives 2513 N, while a 160 mm bore yields 10053 N. A plain cylinder drifts on air loss—the cushion only decelerates—so use a pilot check valve or the SAIL/BSAI lock variant to hold loads. The SUS304 rod suits corrosive environments.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX75CA
- ✓ 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 SI125BX75CA FAQ
Yes, the SI125BX75CA is discontinued. The direct replacement is the SAI125BX75CA. It matches the ISO 15552 interface, 125 mm bore, 75 mm stroke, CA clevis, G1/2 port, and output force perfectly.
It operates at 30-500 mm/s. Force output is 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX75CA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX75CA replacement — usually within 7-8 hours.