This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X420S, 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 SI100X420S
The AirTAC Airtac SI100 Standard Cylinder SI100X420S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 420mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X420S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke420 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X420S
- 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 SI100X420S
The AirTAC SI100X420S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 420mm stroke, delivering 3927 N push force at 0.5 MPa through its G1/2 port. AirTAC replaced this legacy unit with the SAI100X420S. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, output force, and porting, so it drops straight into existing fixtures.
The SAI replacement upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. The -S suffix means this SKU includes a piston magnet for legacy CS1-B/DS1-B sensors, whereas the SAI uses current AirTAC switches. You can also spec Viton H seals for 0-150 C heat, or choose SAIL/BSAI lock variants the SI lacked.
Airtac SI100 Standard Cylinder SI100X420S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X420S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X420S |
| Bore size | Ø100 mm |
| Stroke | 420 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 SAI100X420S 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 SAI100X420S 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 SI100X420S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×420 | 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 SI100X420S Is Used
Heavy Press Clamping
Secures large metal castings during machining operations, utilizing the 3927 N push force at 0.5 MPa to hold components rigidly against cutting loads.
Pallet Lift Gates
Actuates heavy loading dock gates and ramps, where the 420mm stroke provides the reach needed to clear tall pallet jacks and forklifts.
Replacing the Airtac SI100 Standard Cylinder SI100X420S with the SAI100X420S
To replace the discontinued SI100X420S, order the SAI100X420S and confirm the ISO 15552 mounting interface, 100mm bore, 420mm stroke, G1/2 port (PT/G/NPT thread options), and your specific mounting accessory. Because this is a 420mm stroke, add external guides to prevent rod bending and side-load wear. If you need to downsize, a 80mm bore gives 2513 N push at 0.5 MPa; if you need more force, a 125mm bore yields 6136 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding. The SAIF variant (bores 32-100) adds a built-in 4M valve if you need integrated control.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X420S
- ✓ 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 SI100X420S FAQ
Yes, the SI100X420S is discontinued. The direct replacement is the AirTAC SAI100X420S. It is dimensionally interchangeable per ISO 15552, retaining the same 100mm bore, 420mm stroke, G1/2 port, and mounting interface, so it fits your existing fixtures perfectly.
The 100mm bore features a G1/2 port and delivers 3927 N push / 3681 N pull at 0.5 MPa, 5497 N push at 0.7 MPa, 7068 N push at 0.9 MPa, and a theoretical max of 801 kgf at 1.0 MPa. It operates at 30-800 mm/s with a 25mm rod and M20x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X420S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X420S replacement — usually within 7-8 hours.