This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X500SCB, 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 SI125X500SCB
The AirTAC SI125 Standard Cylinder SI125X500SCB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 500mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X500SCB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X500SCB
- 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 SI125X500SCB
The AirTAC SI125X500SCB is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 500 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. AirTAC replaced this end-of-life unit with the SAI125X500SCB, a direct upgrade retaining the exact ISO 15552 mounting interface, CB clevis, M27x2 thread, and output force.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also adds SAIL and BSAI lock variants the SI lacked. Your -S suffix means it has a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X500SCB Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X500SCB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X500SCB |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAI125X500SCB 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 SAI125X500SCB 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 SI125X500SCB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SI125X500SCB Is Used
Heavy Stamp Press Feed
Drives heavy material blanks into large stamping presses, utilizing the 6136 N push force to move thick steel plates reliably over the 500 mm travel.
Pallet Discharge Gate
Actuates large diverter gates for heavy wooden pallets in high-throughput distribution centers, where the CB clevis handles pivot stresses.
Large Mold Extraction
Pushes substantial injection molds or cast components out of machinery beds, requiring the full 500 mm extension and robust 32 mm rod.
Replacing the Airtac SI125 Standard Cylinder SI125X500SCB with the SAI125X500SCB
To replace the SI125X500SCB, order the SAI125X500SCB. Verify your ISO 15552 CB clevis mounting, 500 mm stroke, G1/2 port, and M27x2 rod thread. Because this is a 500 mm stroke, use external guides to prevent rod bending and side-load damage. If sizing up or down, note the 125 mm bore yields 6136 N push at 0.5 MPa, while the 100 mm bore offers 3927 N. A plain cylinder drifts without air; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X500SCB
- ✓ 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 SI125X500SCB FAQ
Yes, the AirTAC SI125X500SCB is discontinued. The direct replacement is the SAI125X500SCB. It features the same ISO 15552 mounting interface, 125 mm bore, 500 mm stroke, CB clevis, and G1/2 port, fitting existing fixtures perfectly.
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 SAI125X500SCB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X500SCB replacement — usually within 7-8 hours.