This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX65, 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 SI125AX65
The AirTAC Airtac SI125 Standard Cylinder SI125AX65 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 SAI125AX65, 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 → SAI125AX65
- 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 SI125AX65
The AirTAC SI125AX65 is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 65mm stroke, delivering 6136 N push force at 0.5 MPa. It features a G1/2 port, an M27x2 rod thread, and a SUS420J2 stainless steel piston rod. As this legacy model is end-of-life, the direct replacement is the SAI125AX65, matching the exact ISO 15552 mounting interface, output force, and dimensions.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. Note this SKU lacks a magnet so it cannot accept CS1-B/DS1-B sensors, and the plain cylinder does not hold load without air—requiring an external rod lock or SAIL variant for secure holding.
Airtac SI125 Standard Cylinder SI125AX65 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX65 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX65 |
| 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 SAI125AX65 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 SAI125AX65 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 SI125AX65
| 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 SI125AX65 Is Used
Heavy-Duty Pressing
Drives robust pressing and stamping operations requiring substantial thrust, utilizing the 6136 N push force at 0.5 MPa.
Material Forming
Applies steady downward clamping pressure in forming jigs, relying on the 40mm adjustable air cushions to absorb end-of-stroke impact.
Large Fixture Actuation
Shifts heavy industrial fixture components over short 65mm distances where high output force and a rigid 32mm rod are essential.
Replacing the Airtac SI125 Standard Cylinder SI125AX65 with the SAI125AX65
To replace the discontinued SI125AX65, order the SAI125AX65. Confirm the ISO 15552 mounting fixtures, the 125mm bore, 65mm stroke, G1/2 port (PT/G/NPT thread options), and the SUS420J2 stainless rod. Sizing checks: if downsizing, a 100mm bore yields 3927 N push at 0.5 MPa; if upsizing, a 160mm bore provides 10053 N. The cushion only decelerates the load; it does not hold position. For drop prevention on air loss, use an external pilot check valve or the SAIL/BSAI lock variants. Because this non-magnetic SKU cannot take a switch, add the -S magnet to the SAI order if position sensing is needed.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX65
- ✓ 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 SI125AX65 FAQ
Yes, the AirTAC SI125AX65 is discontinued. The direct replacement is the SAI125AX65. It is dimensionally interchangeable per ISO 15552, retaining the same 125mm bore, 65mm stroke, force, G1/2 port, and mounting accessories.
This double-acting cylinder has a G1/2 port. It delivers a push force of 6136 N and a pull force of 5734 N at 0.5 MPa. At 0.7 MPa the push force is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX65
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX65 replacement — usually within 7-8 hours.