This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X280STC, 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 SI100X280STC
The AirTAC Airtac SI100 Standard Cylinder SI100X280STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 280mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X280STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke280 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X280STC
- 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 SI100X280STC
The AirTAC SI100X280STC is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore, 280mm stroke, and a TC trunnion mount. Delivering 3927N push force at 0.5MPa via a G1/2 port, it is directly replaced by the SAI100X280STC. This direct upgrade matches the original ISO 15552 mounting interface, bore, stroke, output force, and accessories. The SAI revision upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life, while the SAI family introduces SAIL, SAIF, and BSAI lock or self-valve variants the SI lacked.
The -S suffix indicates a piston magnet for legacy CS1-B/DS1-B sensors (the SAI replacement uses current AirTAC switches). You can specify Viton H seals to raise the -20 to +70C operating range up to 150C, and choose carbon, SUS420J2, or SUS304 rod materials.
Airtac SI100 Standard Cylinder SI100X280STC Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X280STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X280STC |
| Bore size | Ø100 mm |
| Stroke | 280 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 SAI100X280STC 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 SAI100X280STC 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 SI100X280STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×280 | 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 SI100X280STC Is Used
Heavy Press Ejection
Provides the 3927N push force required to eject dense stamped metal parts from heavy press dies.
Pallet Lift Gates
Actuates large conveyor pallet gates using the TC trunnion mount to handle 200kg vertical loads safely.
Large Component Clamping
Secures bulky machinery housings during machining with a 280mm stroke and 36mm end cushions.
Replacing the Airtac SI100 Standard Cylinder SI100X280STC with the SAI100X280STC
To replace the SI100X280STC, order the SAI100X280STC. Confirm the ISO 15552 TC trunnion interface, 100mm bore, 280mm stroke, G1/2 port (PT/G/NPT thread), and the -S magnet for position sensing. The 280mm stroke is under the 1500mm standard maximum, but at this length you should verify guide alignment to prevent rod-bending side loads. If sizing down, the 80mm bore yields 2513N at 0.5MPa; if sizing up, the 125mm bore provides 6136N. Note that a standard cylinder drifts on air loss because the 36mm adjustable cushion only decelerates at stroke end. For secure load holding, use an external pilot check valve, a rod lock, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X280STC
- ✓ 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 SI100X280STC FAQ
Yes, the SI100X280STC is discontinued. The direct replacement is the SAI100X280STC. It is dimensionally interchangeable per ISO 15552, matching the 100mm bore, 280mm stroke, G1/2 port, TC mount, and output force.
It features a G1/2 air port and M20x1.5 rod thread. Force output is 3927N push and 3681N pull at 0.5MPa, 5497N push at 0.7MPa, 7068N push at 0.9MPa, with a theoretical max of 801kgf at 1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X280STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X280STC replacement — usually within 7-8 hours.