This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100AX275S, 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 SI100AX275S
The AirTAC Airtac SI100 Standard Cylinder SI100AX275S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 275mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100AX275S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke275 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100AX275S
- 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 SI100AX275S
The AirTAC SI100AX275S is a discontinued double-acting ISO 15552 profile cylinder featuring a 100mm bore, 275mm stroke, and a SUS420J2 stainless steel rod. Delivering 3927 N of push force at 0.5 MPa via its G1/2 port, it is replaced by the SAI100AX275S. This direct successor shares identical ISO 15552 mounting dimensions, stroke, and output force.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. This magnet-ready unit (-S) accepts legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL lock, SAIF valve, and BSAI clamp variants absent from the SI line.
Airtac SI100 Standard Cylinder SI100AX275S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100AX275S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100AX275S |
| Bore size | Ø100 mm |
| Stroke | 275 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 SAI100AX275S 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 SAI100AX275S 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 SI100AX275S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×275 | 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 SI100AX275S Is Used
Press Fit Assembly
Drives heavy bushings into housings, using the 3927 N push force at 0.5 MPa to seat components reliably.
Heavy Product Diverters
Pushes large cartons across conveyor belts, where the adjustable 36mm air cushions absorb kinetic energy at stroke ends.
Replacing the Airtac SI100 Standard Cylinder SI100AX275S with the SAI100AX275S
To replace this SI100AX275S, order the SAI100AX275S. Verify your ISO 15552 mounting interface, 275mm stroke, G1/2 port, and the -S magnet for CS1-B/DS1-B switches. The -A rod denotes SUS420J2 stainless steel. If downsizing, the 80mm bore yields 2513 N push at 0.5 MPa; if upsizing, the 125mm bore provides 6136 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock or the SAIL/BSAI variants. At 275mm stroke, use a guide to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100AX275S
- ✓ 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 SI100AX275S FAQ
Yes, the SI100AX275S is discontinued. The direct replacement is the SAI100AX275S. It is dimensionally interchangeable per ISO 15552, retaining the same 100mm bore, 275mm stroke, force, G1/2 port, and mounting fixtures.
This double-acting cylinder features a G1/2 air port. It delivers 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, and a theoretical maximum force of 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100AX275S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100AX275S replacement — usually within 7-8 hours.