This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X303SN, 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 SI100X303SN
The AirTAC Airtac SI100 Standard Cylinder SI100X303SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 303mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X303SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke303 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X303SN
- 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 SI100X303SN
The AirTAC SI100X303SN is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 303mm stroke. It delivers 3927 N push force at 0.5 MPa via a G1/2 port. AirTAC replaced this legacy unit with the SAI100X303SN, a direct replacement retaining the exact ISO 15552 mounting interface, bore, stroke, output force, and port size. The SAI features an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. The NBR seal handles -20 to +70 C, while a Viton H option extends this to 150 C.
The SAI family also introduces variants the SI lacked, such as the SAIL air-released lock, SAIF built-in valve, and BSAI clamp-lock. Your SI100X303SN includes a piston magnet for legacy CS1-B/DS1-B sensors; the SAI replacement uses current AirTAC switches.
Airtac SI100 Standard Cylinder SI100X303SN Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X303SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X303SN |
| Bore size | Ø100 mm |
| Stroke | 303 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 SAI100X303SN 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 SAI100X303SN 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 SI100X303SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×303 | 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 SI100X303SN Is Used
Heavy Material Lifts
Drives vertical elevators and heavy pallet lifts requiring up to 200 kg of safe lifting capacity at 0.5 MPa.
Press and Forming
Provides steady 3927 N clamping thrust for light pressing, bending, and holding assemblies in automated cells.
Long-Stroke Diversion
Actuates large package diverters or heavy gauge stops over a 303mm travel distance, needing external guides to manage side loads.
Replacing the Airtac SI100 Standard Cylinder SI100X303SN with the SAI100X303SN
To replace the discontinued SI100X303SN, order the SAI100X303SN. Confirm the ISO 15552 mounting interface, the 100mm bore, the 303mm nonstandard stroke, the G1/2 port (PT/G/NPT), and your mounting accessory. Because this is a 303mm stroke, add external guides to prevent rod bending and side-load wear. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. The magnet (-S) allows position sensing. If downsizing, an 80mm bore yields 2513 N push at 0.5 MPa; if upsizing, a 125mm bore yields 6136 N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X303SN
- ✓ 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 SI100X303SN FAQ
Yes, the SI100X303SN is discontinued. The direct replacement is the SAI100X303SN. It is dimensionally interchangeable per ISO 15552, matching the 100mm bore, 303mm stroke, 3927 N force, G1/2 port, and mounting interface.
This double-acting cylinder has a G1/2 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 of 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X303SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X303SN replacement — usually within 7-8 hours.