This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X550H, 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 SI100X550H
The AirTAC Airtac SI100 Standard Cylinder SI100X550H 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 SAI100X550H, 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 → SAI100X550H
- 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 SI100X550H
The AirTAC SI100X550H is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 550mm stroke. Built for high-temperature duty, it features a Viton H seal (0 to 150 C) and delivers a push force of 3927 N at 0.5 MPa. Because this SKU lacks a magnet, it cannot accept a position sensor. The direct replacement is the SAI100X550H, matching the G1/2 port, M20x1.5 thread, and 36mm cushions.
The SAI upgrade introduces a two-piece Y-shaped piston seal for lower start-up pressure and longer life. It also adds SAIL and BSAI lock variants absent from the SI line. Since this is a plain cylinder, the cushion only decelerates; it will not hold a load on air loss.
Airtac SI100 Standard Cylinder SI100X550H Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X550H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X550H |
| 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 SAI100X550H 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 SAI100X550H 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 SI100X550H
| 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 SI100X550H Is Used
High-Temperature Actuation
Drives heavy doors or platens in hot environments up to 150 C using the Viton H seal, delivering 3927 N push force at 0.5 MPa.
Heavy Pallet Diversion
Pushes loaded pallets along assembly lines, utilizing the 36mm adjustable air cushions to decelerate the 100mm bore at stroke ends.
Replacing the Airtac SI100 Standard Cylinder SI100X550H with the SAI100X550H
To replace the SI100X550H, order the SAI100X550H to guarantee the exact ISO 15552 mounting interface, 100mm bore, 550mm stroke, G1/2 port, and Viton H high-temp seals. If you need less force, step down to an 80mm bore; for more power, move to 125mm. Because this non-magnet SKU cannot take a CS1-B or DS1-B sensor, confirm if you need a switch. For load holding on air loss, the cushion will not lock the piston—select the SAIL or BSAI lock variant, or use an external pilot check valve. Finally, with a 550mm stroke, use external guides to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X550H
- ✓ 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 SI100X550H FAQ
Yes, the SI100X550H is discontinued. The direct replacement is the SAI100X550H. It is dimensionally interchangeable per ISO 15552, matching the 100mm bore, 550mm stroke, G1/2 port, and mounting interface. The SAI features an upgraded piston seal for longer life.
The 100mm bore features a G1/2 port and a 25mm rod. Force output is 3927 N push and 3681 N pull at 0.5 MPa, 5497 N push at 0.7 MPa, and 7068 N push at 0.9 MPa. The theoretical maximum is 801 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X550H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X550H replacement — usually within 7-8 hours.