This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X270S, 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 SI100X270S
The AirTAC Airtac SI100 Standard Cylinder SI100X270S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 270mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X270S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke270 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X270S
- 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 SI100X270S
The AirTAC SI100X270S is a discontinued double-acting ISO 15552 profile cylinder with a 100 mm bore and 270 mm stroke, delivering 3927 N push force at 0.5 MPa through its G1/2 port. AirTAC replaced this legacy unit with the SAI100X270S. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, output force, port size and accessories, fitting existing fixtures perfectly.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also introduces lock and valve variants the SI lacked, and you can specify Viton H seals for high-temperature environments.
Airtac SI100 Standard Cylinder SI100X270S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X270S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X270S |
| Bore size | Ø100 mm |
| Stroke | 270 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 SAI100X270S 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 SAI100X270S 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 SI100X270S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×270 | 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 SI100X270S Is Used
Heavy Press Clamping
Applies the 5497 N push force at 0.7 MPa to secure heavy metal components during machining and stamping operations.
Pallet Diverting
Handles robust diverting of loaded pallets along packaging lines, utilizing the 270 mm stroke to clear the conveyor path.
Replacing the Airtac SI100 Standard Cylinder SI100X270S with the SAI100X270S
To replace the SI100X270S, order the SAI100X270S and confirm the ISO 15552 interface, 100 mm bore, 270 mm stroke, G1/2 port (PT/G/NPT), and mounting accessory. Because this unit has the -S magnet, it supports legacy CS1-B/DS1-B sensors, whereas the SAI replacement uses current AirTAC switches. For sizing, a 100 mm bore yields 3927 N push at 0.5 MPa; dropping to an 80 mm bore gives 2513 N, while a 125 mm bore provides 6136 N. Since the stroke is 270 mm, ensure adequate guide support to prevent rod bending and side-load wear. A plain cylinder does not hold load on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for suspended loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X270S
- ✓ 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 SI100X270S FAQ
Yes, the SI100X270S is discontinued. The direct replacement is the AirTAC SAI100X270S. It features the same ISO 15552 mounting interface, 100 mm bore, 270 mm stroke, output force, and G1/2 port, fitting existing fixtures directly.
This double-acting cylinder uses a G1/2 air port. The thrust ratings are 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 SAI100X270S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X270S replacement — usually within 7-8 hours.