This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X125FA, 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 SI100 Standard Cylinder SI100X125FA
The AirTAC Airtac SI100 Standard Cylinder SI100X125FA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 125mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X125FA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X125FA
- 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 SI100 Standard Cylinder SI100X125FA
The AirTAC SI100X125FA is a discontinued double-acting ISO 15552 profile cylinder with an FA flange mount, delivering a push force of 3927 N at 0.5 MPa through its 100 mm bore and 125 mm stroke. Because this legacy SI unit is end-of-life, AirTAC supplies the SAI100X125FA as the direct replacement. It matches the exact ISO 15552 mounting interface, G1/2 port size, M20x1.5 rod thread, and output force, dropping cleanly into existing fixtures.
The upgraded SAI family introduces an advanced piston seal utilizing two Y-shaped one-way elements for extended lifespan and lower start-up pressure. Note that this specific SKU lacks a magnet (-S) and therefore cannot accept position sensors like the legacy CS1-B or DS1-B switches.
Airtac SI100 Standard Cylinder SI100X125FA Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X125FA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X125FA |
| Bore size | Ø100 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M20×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 36 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI100X125FA carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 kgf | |
The SAI100X125FA produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI100 Standard Cylinder SI100X125FA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×125 | 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 SI100 Standard Cylinder SI100X125FA Is Used
Heavy-Duty Pressing
Drives large stamping and pressing fixtures requiring up to 5497 N of thrust at 0.7 MPa, utilizing the rigid FA flange to maintain alignment under heavy offset loads.
Pallet Diverting
Actuates robust routing gates and heavy pallet stops on high-throughput packaging lines, where the 125 mm stroke provides rapid and decisive movement.
Replacing the Airtac SI100 Standard Cylinder SI100X125FA with the SAI100X125FA
To replace the discontinued SI100X125FA, order the SAI100X125FA, confirming the ISO 15552 FA flange interface, 100 mm bore, 125 mm stroke, and G1/2 port (available in PT, G, or NPT threads). If downsizing is possible, the 80 mm bore yields 2513 N push at 0.5 MPa; if upsizing is needed, the 125 mm bore provides 6136 N. Remember that a standard double-acting cylinder drifts on air loss—the 36 mm adjustable air cushions only decelerate near stroke end, so for load holding you must add an external pilot check valve, a rod lock, or switch to the SAIL or BSAI lock variant. The SAI family also offers the SAIF variant with a built-in 4M valve for bores up to 100 mm. Rod material options include carbon steel, SUS420J2 (A), or SUS304 (B), with seal options for standard TPU or high-temp Viton H.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X125FA
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI100 Standard Cylinder SI100X125FA FAQ
Yes, the SI100X125FA is discontinued. The direct replacement is the SAI100X125FA. It is dimensionally interchangeable per ISO 15552, retaining the same 100 mm bore, 125 mm stroke, FA flange mount, G1/2 port, and output force. You simply order the SAI equivalent for a seamless fixture swap.
This 100 mm bore double-acting cylinder features a G1/2 air port and an M20x1.5 rod thread. The thrust ratings are: 3927 N push and 3681 N pull at 0.5 MPa; 5497 N push at 0.7 MPa; 7068 N push at 0.9 MPa; with a theoretical maximum force of 801 kgf at 1.0 MPa. It operates at speeds between 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X125FA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X125FA replacement — usually within 7-8 hours.