This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100AX280S, 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 SI100AX280S
The AirTAC SI100 Standard Cylinder SI100AX280S 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 SAI100AX280S, 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 → SAI100AX280S
- 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 SI100AX280S
The AirTAC SI100AX280S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 280mm stroke. It delivers 3927 N push force at 0.5 MPa through a G1/2 port. AirTAC replaced this legacy unit with the SAI100AX280S, a direct replacement matching the exact ISO 15552 mounting interface, stroke, force and port size.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The original SI100AX280S uses a SUS420J2 stainless steel rod (-A) and includes a piston magnet (-S) for CS1-B/DS1-B switches.
Airtac SI100 Standard Cylinder SI100AX280S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100AX280S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100AX280S |
| 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 SAI100AX280S 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 SAI100AX280S 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 SI100AX280S
| 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 SI100AX280S Is Used
Heavy Press Clamping
Ideal for holding heavy fixtures or workpieces in machining centers, utilizing the 3927 N push force at 0.5 MPa with a 280mm stroke to clear the work area.
Pallet Diverting
Drives large pallet stops or diverters on heavy-duty conveyor lines, where the 100mm bore and adjustable air cushions absorb high kinetic energy at stroke ends.
Replacing the Airtac SI100 Standard Cylinder SI100AX280S with the SAI100AX280S
To replace the SI100AX280S, order the SAI100AX280S. Confirm the ISO 15552 mounting interface, the 100mm bore, 280mm stroke, G1/2 port (PT/G/NPT thread options), the SUS420J2 stainless rod (-A), and the magnet (-S) for current AirTAC switches. If you need less force, a 80mm bore yields 2513 N push at 0.5 MPa; if you need more, a 125mm bore gives 6136 N. Because the stroke is 280mm, ensure adequate guide support to prevent rod bending and side loads. A plain cylinder drifts on air loss; for load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant. The SAI family also adds the SAIF self-valve option.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100AX280S
- ✓ 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 SI100AX280S FAQ
Yes, the SI100AX280S is discontinued. The direct replacement is the SAI100AX280S. It shares the same ISO 15552 mounting interface, 100mm bore, 280mm stroke, G1/2 port, and output force, so it fits directly into existing fixtures.
At 0.5 MPa, the push force is 3927 N and the pull force is 3681 N. At 0.7 MPa it pushes 5497 N, and at 0.9 MPa it pushes 7068 N. The theoretical maximum force is 801 kgf at 1.0 MPa. The operating speed range is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100AX280S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100AX280S replacement — usually within 7-8 hours.