This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X65S, 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 SI125X65S
The AirTAC SI125 Standard Cylinder SI125X65S 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 SAI125X65S, 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 → SAI125X65S
- 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 SI125X65S
The AirTAC SI125X65S 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 port, M27x2 rod thread, and a piston magnet for CS1-B/DS1-B sensors. AirTAC replaced this legacy unit with the SAI125X65S.
The SAI125X65S is a direct replacement sharing the exact ISO 15552 mounting interface, bore, stroke, and force. It upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure. If you need load holding on air loss, explore the SAIL or BSAI lock variants, as standard cushions only decelerate.
Airtac SI125 Standard Cylinder SI125X65S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X65S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X65S |
| 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 SAI125X65S 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 SAI125X65S 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 SI125X65S
| 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 SI125X65S Is Used
Heavy Press Clamping
Generates 6136 N of push force at 0.5 MPa to secure heavy metal workpieces in machining and press operations.
Industrial Mold Handling
Shifts substantial injection mold bases with a 32 mm rod and M27x2 thread, ensuring rigid actuation.
Replacing the Airtac SI125 Standard Cylinder SI125X65S with the SAI125X65S
To replace the SI125X65S, order the SAI125X65S. It drops directly into existing ISO 15552 fixtures with identical 125 mm bore, 65 mm stroke, G1/2 port, and mounting accessories. Keep the -S magnet for position sensing (the SAI uses current AirTAC switches, replacing legacy CS1-B/DS1-B). If you need higher force, the 160 mm bore offers 10053 N push at 0.5 MPa; if less is required, the 100 mm bore provides 3927 N. Remember, a plain cylinder drifts without live air—use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants for secure holding. The 32 mm rod and 40 mm cushions handle the 30-500 mm/s speed range reliably.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X65S
- ✓ 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 SI125X65S FAQ
Yes, the SI125X65S is discontinued. The direct replacement is the SAI125X65S. It shares the identical ISO 15552 mounting interface, 125 mm bore, 65 mm stroke, G1/2 port, and output force, fitting existing fixtures perfectly.
The 125 mm bore features a G1/2 port. At 0.5 MPa it provides 6136 N push and 5734 pull force. At 0.7 MPa push 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 SAI125X65S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X65S replacement — usually within 7-8 hours.