This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X100S, 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 SI125X100S
The AirTAC SI125 Standard Cylinder SI125X100S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 100mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X100S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke100 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X100S
- 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 SI125X100S
The AirTAC SI125X100S is a discontinued double-acting ISO 15552 profile cylinder featuring a 125mm bore and 100mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. AirTAC replaced this legacy unit with the SAI125X100S, a direct replacement sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI upgrade introduces an improved piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI family also adds SAIL, SAIF, and BSAI lock or valve variants the SI lacked.
Airtac SI125 Standard Cylinder SI125X100S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X100S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X100S |
| Bore size | Ø125 mm |
| Stroke | 100 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 SAI125X100S 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 SAI125X100S 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 SI125X100S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×100 | 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 SI125X100S Is Used
Heavy Stamp Press Feed
Drives robust clamps and feed mechanisms in metal stamping lines, utilizing the 6136 N push force to move heavy billets securely into the press bed.
Pallet Lift Actuation
Acts as the main lift cylinder in automated palletizer stations, where its 313 kg vertical lift capacity easily handles loaded pallets during sorting.
Large Mold Ejection
Provides reliable ejection force for large injection molds, using the 100mm stroke to push thick parts out of the tooling cavity smoothly.
Replacing the Airtac SI125 Standard Cylinder SI125X100S with the SAI125X100S
To replace the SI125X100S, order the SAI125X100S and confirm your ISO 15552 mounting interface, bore, stroke, port (PT/G/NPT), and accessories match. The G1/2 port and M27x2 rod thread are fixed by the 125mm bore. If you need less force, a 100mm bore yields 3927 N push at 0.5 MPa; if you need more, a 160mm bore provides 10053 N. Remember that a plain cylinder does 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 variant. This 100mm stroke is under 300mm, so rod-bending side-load risks are minimal, but always guide the load anyway.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X100S
- ✓ 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 SI125X100S FAQ
Yes, the SI125X100S is discontinued. The direct replacement is the SAI125X100S. It shares the exact ISO 15552 mounting interface, 125mm bore, 100mm stroke, output force, G1/2 port, and accessories, fitting directly into existing fixtures.
This double-acting cylinder has a 125mm bore and G1/2 port. 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. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X100S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X100S replacement — usually within 7-8 hours.