This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X550, 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 SI100X550
The AirTAC Airtac SI100 Standard Cylinder SI100X550 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 550mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X550, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke550 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X550
- 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 SI100X550
The AirTAC SI100X550 is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 550mm stroke. Delivering 3927 N push force at 0.5 MPa through a G1/2 port, it is replaced by the SAI100X550. This direct upgrade matches the exact ISO 15552 mounting interface, stroke and force, fitting existing fixtures perfectly.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this non-magnet SKU cannot take a sensor, unlike CS1-B/DS1-B equipped units.
Airtac SI100 Standard Cylinder SI100X550 Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X550 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X550 |
| Bore size | Ø100 mm |
| Stroke | 550 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 SAI100X550 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 SAI100X550 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 SI100X550
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×550 | 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 SI100X550 Is Used
Heavy Material Transfer
Drives robust pallet stops and heavy-goods diverters on high-throughput packaging conveyors requiring substantial push force.
Large Press Ejection
Ejects molded components or stamped metal parts from large industrial presses, utilizing the 550mm stroke to clear the die area.
Pallet Positioning Gates
Actuates heavy lifting gates and automated positioning barriers in logistics hubs where high thrust and long travel are essential.
Replacing the Airtac SI100 Standard Cylinder SI100X550 with the SAI100X550
To replace the SI100X550, order the SAI100X550. Verify your ISO 15552 interface, G1/2 port, M20x1.5 rod thread and mounting accessory. This non-magnet SKU cannot accept a sensor; order an SAI variant with S if position detection is needed. Sizing options: a 100mm bore yields 5497 N at 0.7 MPa, while an 80mm bore yields 3518 N. Because stroke is 550mm, use external guides to prevent rod bending from side loads. The air cushion only decelerates; for load holding on air loss, use the SAIL lock, BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X550
- ✓ 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 SI100X550 FAQ
Yes, the SI100X550 is discontinued. The direct replacement is the SAI100X550. It is a true ISO 15552 profile cylinder that matches the original 100mm bore, 550mm stroke, output force, G1/2 port and mounting interface, dropping straight into existing machinery.
It uses a G1/2 air port. 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. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X550
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X550 replacement — usually within 7-8 hours.