This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X440S, 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 SI100X440S
The AirTAC Airtac SI100 Standard Cylinder SI100X440S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 440mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X440S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke440 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X440S
- 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 SI100X440S
The AirTAC SI100X440S is a discontinued double-acting ISO 15552 profile cylinder with a 100 mm bore and 440 mm stroke. It delivers a push force of 3927 N at 0.5 MPa, utilizing a G1/2 port and an M20x1.5 rod thread. The direct replacement is the SAI100X440S, which matches the original ISO 15552 mounting interface, bore, stroke, output force, and port size exactly.
The SAI upgrade introduces a refined piston seal with two Y-shaped one-way elements, ensuring low start-up pressure and extended service life. This magnet-equipped (-S) SI model supports legacy CS1-B/DS1-B sensors, while the SAI family also adds SAIL, SAIF, and BSAI lock and valve variants the SI line lacked.
Airtac SI100 Standard Cylinder SI100X440S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X440S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X440S |
| Bore size | Ø100 mm |
| Stroke | 440 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 SAI100X440S 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 SAI100X440S 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 SI100X440S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×440 | 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 SI100X440S Is Used
Heavy Material Handling
Drives robust pallet transfers and heavy workpiece positioning on assembly lines using its 3927 N push force at 0.5 MPa.
Large Press Ejection
Ejects molded or stamped parts from heavy machinery, benefiting from the 36 mm adjustable air cushions at both ends.
Replacing the Airtac SI100 Standard Cylinder SI100X440S with the SAI100X440S
To replace the discontinued SI100X440S, order the SAI100X440S. Confirm the ISO 15552 mounting interface (such as LB foot or TC trunnion), the 100 mm bore, 440 mm stroke, G1/2 port (PT/G/NPT thread options), and the -S magnet for current AirTAC switch compatibility. When sizing, neighboring bores offer alternatives: an 80 mm bore provides 2513 N push at 0.5 MPa, while a 125 mm bore yields 6136 N. For this 440 mm stroke, add external guides to prevent rod bending and side-load wear. A standard cylinder does not hold load without live air; the cushion only decelerates. For load holding on air loss, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X440S
- ✓ 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 SI100X440S FAQ
Yes, the SI100X440S is discontinued. The direct replacement is the SAI100X440S. It is dimensionally interchangeable per ISO 15552, retaining the same 100 mm bore, 440 mm stroke, output force, G1/2 port, and mounting accessories.
This double-acting cylinder features a G1/2 port. At 0.5 MPa it provides 3927 N push and 3681 N pull force. At 0.7 MPa push is 5497 N, and at 0.9 MPa it is 7068 N. The theoretical maximum force is 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X440S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X440S replacement — usually within 7-8 hours.