This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X65, 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 SI125X65
The AirTAC Airtac SI125 Standard Cylinder SI125X65 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 SAI125X65, 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 → SAI125X65
- 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 SI125X65
The AirTAC SI125X65 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 G1/2 air port, an M27x2 rod thread, and 40 mm adjustable air cushions at both ends. AirTAC replaced this legacy unit with the SAI125X65, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, and output force.
The SAI125X65 introduces an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. For applications needing load holding, the new SAI family offers SAIL and BSAI lock variants the SI lacked. Note this non-magnet SKU cannot accept a sensor, and standard cylinders drift without live air.
Airtac SI125 Standard Cylinder SI125X65 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X65 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X65 |
| 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 SAI125X65 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 SAI125X65 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 SI125X65
| 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 SI125X65 Is Used
Heavy Press Operations
Ideal for driving heavy stamping or forming dies, utilizing the 6136 N push force at 0.5 MPa to seat components firmly.
Automated Clamp Systems
Secures large workpieces or heavy molds during machining, taking advantage of the 5734 N pull force for reliable holding.
Replacing the Airtac SI125 Standard Cylinder SI125X65 with the SAI125X65
To replace the SI125X65, order the SAI125X65. Confirm your existing ISO 15552 mounting fixture, the 65 mm stroke, and the G1/2 port. This non-magnet SKU cannot take a CS1-B or DS1-B sensor; if position detection is required, select an SAI125X65S and use current AirTAC switches. The 125 mm bore yields 6136 N push and 5734 N pull at 0.5 MPa. If you need more force, the 160 mm bore provides 10053 N push, or for less force, the 100 mm bore offers 3927 N. A plain cylinder does not hold load on air loss; for vertical loads, use an external pilot check valve or the SAIL/BSAI lock variant. Operating speed is 30-500 mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X65
- ✓ 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 SI125X65 FAQ
Yes, the AirTAC SI125X65 is discontinued. The direct replacement is the SAI125X65. It features the same ISO 15552 mounting interface, 125 mm bore, 65 mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly while adding an upgraded piston seal.
The 125 mm bore cylinder uses a G1/2 air port. It generates 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, and 11045 N push at 0.9 MPa. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X65
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X65 replacement — usually within 7-8 hours.