This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X510, 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 SI125X510
The AirTAC SI125 Standard Cylinder SI125X510 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 510mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X510, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke510 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X510
- 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 SI125X510
The AirTAC SI125X510 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 510 mm stroke, delivering 6136 N push force at 0.5 MPa through its G1/2 port. As an end-of-line unit, it is replaced by the SAI125X510 direct equivalent.
The SAI upgrade retains the exact ISO 15552 mounting interface, force, and M27x2 rod thread, but introduces a two Y-shaped one-way piston seal for lower start-up pressure. Note this SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X510 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X510 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X510 |
| Bore size | Ø125 mm |
| Stroke | 510 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 SAI125X510 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 SAI125X510 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 SI125X510
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×510 | 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 SI125X510 Is Used
Heavy Press Ejection
Provides the robust 6136 N push at 0.5 MPa needed to eject dense stamped parts from heavy press dies over the 510 mm travel.
Large Mold Handling
Shifts substantial injection molds along the 510 mm stroke where the G1/2 port and 125 mm bore deliver high volume and thrust.
Replacing the Airtac SI125 Standard Cylinder SI125X510 with the SAI125X510
To replace the SI125X510, order the SAI125X510, confirming the ISO 15552 mounting accessory (LB, FA, CA, TC), the G1/2 port thread (PT/G/NPT), and the 510 mm stroke. Since this non-magnet SKU cannot take a sensor, if position detection is needed you must select an SAI equivalent with the -S option for CS1-B/DS1-B switches. For sizing, the 125 mm bore yields 6136 N push at 0.5 MPa; if less force is required, step down to an 100 mm bore (3927 N), or up to 160 mm (10053 N) for heavier loads. Because the 510 mm stroke invites rod bending, use an external guide to prevent side-load damage. Finally, this plain cylinder will drift on air loss—the cushion only decelerates—so for load holding use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X510
- ✓ 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 SI125X510 FAQ
Yes, the SI125X510 is discontinued. The direct replacement is the SAI125X510, which shares the same ISO 15552 mounting interface, 125 mm bore, 510 mm stroke, output force, G1/2 port, and accessories.
The 125 mm bore uses a G1/2 port and M27x2 rod thread. It delivers 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 max of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X510
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X510 replacement — usually within 7-8 hours.