This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X550STC, 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 SI100X550STC
The AirTAC Airtac SI100 Standard Cylinder SI100X550STC 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 SAI100X550STC, 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 → SAI100X550STC
- 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 SI100X550STC
The AirTAC SI100X550STC is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore, 550mm stroke, TC trunnion mount, and a piston magnet (-S). Delivering 3927 N push at 0.5 MPa, it is replaced by the SAI100X550STC. This direct successor maintains the exact G1/2 port, M20x1.5 rod thread, and ISO 15552 mounting dimensions, fitting existing fixtures seamlessly.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also introduces SAIL, SAIF, and BSAI variants absent from the SI line. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI100 Standard Cylinder SI100X550STC Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X550STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X550STC |
| 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 SAI100X550STC 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 SAI100X550STC 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 SI100X550STC
| 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 SI100X550STC Is Used
Heavy Material Transfer
Drives large pallets or heavy workpieces along assembly lines, utilizing the 3927 N push force at 0.5 MPa to move substantial loads reliably over the 550mm travel.
Automated Pallet Handling
Indexes loaded pallets into wrapping or strapping stations, where the TC trunnion mount accommodates the articulation needed for long-stroke actuation.
Large Press Feeding
Feeds heavy blanks into hydraulic presses, relying on the 100mm bore's robust thrust and adjustable end cushions to manage kinetic energy at stroke ends.
Replacing the Airtac SI100 Standard Cylinder SI100X550STC with the SAI100X550STC
To replace the SI100X550STC, order the SAI100X550STC. Verify your ISO 15552 TC trunnion mounting hardware, the G1/2 air port, and the M20x1.5 rod thread. The 550mm stroke is within the 1500mm standard limit, but at this length you must prevent side-load and rod-bending by using an external guide to support the load. Sizing both ways: this 100mm bore yields 3927 N push at 0.5 MPa (801 kgf max at 1.0 MPa); if less force is needed, an 80mm bore provides 2513 N, or a 125mm bore offers 6136 N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant. The -S magnet works with legacy CS1-B/DS1-B switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X550STC
- ✓ 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 SI100X550STC FAQ
Yes, the SI100X550STC is discontinued. The direct replacement is the SAI100X550STC. It is dimensionally interchangeable per ISO 15552, retaining the same 100mm bore, 550mm stroke, G1/2 port, TC mount, and output force.
The air port is G1/2. At 0.5 MPa it provides 3927 N push and 3681 N pull; at 0.7 MPa push is 5497 N; at 0.9 MPa push is 7068 N. The theoretical maximum force is 801 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X550STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X550STC replacement — usually within 7-8 hours.