This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X650CA, 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 SI125X650CA
The AirTAC Airtac SI125 Standard Cylinder SI125X650CA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 650mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X650CA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke650 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X650CA
- 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 SI125X650CA
The AirTAC SI125X650CA is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 650 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X650CA, which matches the bore, stroke, force, port, and CA clevis mounting interface exactly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This no-magnet SKU cannot accept a sensor, unlike the legacy CS1-B/DS1-B switches used on -S models.
Airtac SI125 Standard Cylinder SI125X650CA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X650CA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X650CA |
| Bore size | Ø125 mm |
| Stroke | 650 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 SAI125X650CA 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 SAI125X650CA 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 SI125X650CA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×650 | 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 SI125X650CA Is Used
Heavy Press Staging
Ideal for positioning heavy steel blanks into a hydraulic press, utilizing the 6136 N push force at 0.5 MPa to shift substantial mass across the 650 mm travel.
Pallet Dispenser
The CA clevis mount accommodates the pivot arc needed to push empty pallets from a vertical magazine stack, while the 125 mm bore handles the dead weight.
Bulk Material Divert
Deployed on heavy-duty aggregate lines to swing a diverter gate over 650 mm, with the 5734 N pull force reliably retracting the mechanism against material resistance.
Replacing the Airtac SI125 Standard Cylinder SI125X650CA with the SAI125X650CA
To replace the SI125X650CA, order the SAI125X650CA. Verify the ISO 15552 CA clevis mount, 650 mm stroke, and G1/2 port. Because this is a no-magnet SKU, it cannot support sensing; if switches are needed, select an SAI model with the S suffix. At 0.5 MPa, the 125 mm bore yields 6136 N push and 5734 N pull. If sizing down, a 100 mm bore provides 3927 N push; if sizing up, a 160 mm bore yields 10053 N. For the 650 mm stroke, use external guides to prevent rod bending and side-load damage. This plain cylinder will not hold load on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X650CA
- ✓ 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 SI125X650CA FAQ
Yes, the AirTAC SI125X650CA is discontinued. The direct replacement is the SAI125X650CA. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 650 mm stroke, G1/2 port, and CA clevis mounting interface.
This double-acting 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, 11045 N push at 0.9 MPa, and a theoretical maximum of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X650CA
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