This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X420, 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 SI100X420
The AirTAC Airtac SI100 Standard Cylinder SI100X420 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 SAI100X420, 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 → SAI100X420
- 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 SI100X420
The AirTAC SI100X420 is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 420mm stroke. It delivers 3927N push and 3681N pull at 0.5MPa, utilizing a G1/2 port and M20x1.5 rod thread. AirTAC replaced this legacy unit with the SAI100X420, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, force, and port size.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. For applications needing load holding, note the SAI family introduces SAIL and BSAI lock variants absent in the SI line. Since this specific SKU lacks a magnet, it cannot accept a sensor.
Airtac SI100 Standard Cylinder SI100X420 Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X420 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X420 |
| 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 SAI100X420 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 SAI100X420 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 SI100X420
| 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 SI100X420 Is Used
Heavy Conveyor Diversion
Handles robust package redirect arms on high-throughput lines, using the 420mm stroke to push heavy pallets cleanly across transfer stations.
Pallet Lift Gates
Drives large lifting gates in automated storage systems, where the 100mm bore provides the necessary force to elevate loaded platforms reliably.
Press Ejection Systems
Ejects dense manufactured parts from machining centers, benefiting from the adjustable end cushions to decelerate heavy loads over the long 420mm travel.
Replacing the Airtac SI100 Standard Cylinder SI100X420 with the SAI100X420
To replace the discontinued SI100X420, order the SAI100X420. Confirm the ISO 15552 mounting interface, 100mm bore, 420mm stroke, G1/2 port (PT/G/NPT thread options), and your mounting accessory. Because this SKU has no magnet, it cannot support a sensor; if position detection is needed, order an SAI variant with the magnet option for current AirTAC switches. Sizing both ways: a neighboring 80mm bore yields 2513N push at 0.5MPa, while a 125mm bore yields 6136N. For load holding on air loss, a plain cylinder drifts; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. With a 420mm stroke, prevent rod bending by using an external guide to manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X420
- ✓ 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 SI100X420 FAQ
Yes, the AirTAC SI100X420 is discontinued. The direct replacement is the SAI100X420. It is dimensionally interchangeable per ISO 15552, matching the 100mm bore, 420mm stroke, 3927N force, G1/2 port, and mounting interface, so it fits existing fixtures perfectly.
The 100mm bore uses a G1/2 port. Force ratings are: 3927N push and 3681N pull at 0.5MPa, 5497N push at 0.7MPa, 7068N push at 0.9MPa, and a theoretical maximum of 801kgf at 1.0MPa. The piston rod is 25mm with an M20x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X420
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X420 replacement — usually within 7-8 hours.