This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X100FA, 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 SI125X100FA
The AirTAC SI125 Standard Cylinder SI125X100FA 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 SAI125X100FA, 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 → SAI125X100FA
- 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 SI125X100FA
The AirTAC SI125X100FA is a discontinued double-acting ISO 15552 profile cylinder with an FA flange, delivering 6136 N push and 5734 N pull at 0.5 MPa. It features a 125 mm bore, 100 mm stroke, G1/2 port, M27x2 rod thread, and 40 mm adjustable air cushions. Because this SKU lacks a magnet (-S), it cannot accept position sensors.
AirTAC replaced this legacy unit with the SAI125X100FA, a direct sharing the exact ISO 15552 mounting interface, force, and port size. The SAI upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life.
Airtac SI125 Standard Cylinder SI125X100FA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X100FA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X100FA |
| 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 SAI125X100FA 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 SAI125X100FA 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 SI125X100FA
| 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 SI125X100FA Is Used
Heavy Pressing
Drives large stamping or forming presses requiring up to 6136 N of push force at 0.5 MPa with stable FA flange mounting.
Pallet Diverters
Moves or halts substantial pallets on high-throughput lines, relying on the 40 mm cushions to absorb end-of-stroke impact.
Replacing the Airtac SI125 Standard Cylinder SI125X100FA with the SAI125X100FA
To replace the SI125X100FA, order the SAI125X100FA and confirm the ISO 15552 FA flange, 125 mm bore, 100 mm stroke, and G1/2 port. This non-magnetic SKU cannot host CS1-B/DS1-B sensors, so if switching is needed, specify an SAI with the magnet option. Sizing both ways: a 100 mm bore gives 3927 N push @0.5 MPa, while a 160 mm bore yields 10053 N. If your application needs load holding on air loss, note that the standard cushion only decelerates the piston; you must add an external rod lock, a pilot check valve, or switch to the SAIL or BSAI lock variant. The SAI family also offers the SAIF self-valve variant, though only for bores up to 100 mm.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X100FA
- ✓ 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 SI125X100FA FAQ
Yes, the SI125X100FA is discontinued. The direct replacement is the SAI125X100FA. It shares the identical ISO 15552 FA flange interface, 125 mm bore, 100 mm stroke, output force, and G1/2 port, fitting directly into existing fixtures.
This double-acting cylinder features a G1/2 air 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 maximum force of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X100FA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X100FA replacement — usually within 7-8 hours.