This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX65, 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 SI125BX65
The AirTAC Airtac SI125 Standard Cylinder SI125BX65 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 65mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX65, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke65 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX65
- 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 SI125BX65
The AirTAC SI125BX65 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 65 mm stroke. Delivering 6136 N push force at 0.5 MPa, it features a SUS304 stainless steel rod and a G1/2 air port. The direct replacement is the SAI125BX65, matching the exact ISO 15552 mounting interface, output force, and stroke.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For sensing, this no-magnet SKU cannot take a switch. For high heat, Viton H seals raise the temperature range to 0-150 C.
Airtac SI125 Standard Cylinder SI125BX65 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX65 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX65 |
| Bore size | Ø125 mm |
| Stroke | 65 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 SAI125BX65 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 SAI125BX65 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 SI125BX65
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×65 | 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 SI125BX65 Is Used
Heavy Press Clamping
Applies the 6136 N push force at 0.5 MPa to secure large metal castings during machining operations.
Pallet Lift Gates
Drives 65 mm stroke lifting arms on loading docks, safely moving loads near the 313 kg vertical limit.
Mold Ejection Systems
Utilizes the SUS304 stainless rod for corrosion resistance when ejecting composite parts from heated molds.
Replacing the Airtac SI125 Standard Cylinder SI125BX65 with the SAI125BX65
To replace the SI125BX65, order the SAI125BX65. Verify the ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/2 port thread, and the M27x2 rod thread. This SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors; order an -S variant if position detection is required. The 125 mm bore yields 6136 N push at 0.5 MPa; if less force is needed, an 80 mm bore provides 2513 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX65
- ✓ 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 SI125BX65 FAQ
Yes, the SI125BX65 is discontinued. The direct replacement is the SAI125BX65. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 65 mm stroke, force, G1/2 port, and mounting interface.
It has a G1/2 air port. 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 theoretical max of 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX65
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX65 replacement — usually within 7-8 hours.