This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X508S, 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 SI100X508S
The AirTAC Airtac SI100 Standard Cylinder SI100X508S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 508mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X508S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke508 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X508S
- 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 SI100X508S
The AirTAC SI100X508S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 508mm stroke. It delivers 3927N of push force at 0.5MPa through a G1/2 port. AirTAC replaced this legacy unit with the SAI100X508S, a direct upgrade retaining the exact mounting interface, bore, stroke, output force, and port size.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. It also introduces SAIL, SAIF, and BSAI lock variants absent in the original SI line.
Airtac SI100 Standard Cylinder SI100X508S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X508S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X508S |
| Bore size | Ø100 mm |
| Stroke | 508 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 SAI100X508S 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 SAI100X508S 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 SI100X508S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×508 | 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 SI100X508S Is Used
Heavy Material Transfer
Pushes loaded pallets or heavy workpieces along a conveyor line using its 3927N thrust at 0.5MPa.
Large Press Ejection
Ejects formed parts from large presses over the 508mm stroke, requiring external guides to prevent rod bending.
Replacing the Airtac SI100 Standard Cylinder SI100X508S with the SAI100X508S
To replace the SI100X508S, order the SAI100X508S and confirm the ISO 15552 mounting interface, 100mm bore, 508mm stroke, G1/2 port, and M20x1.5 rod thread. The -S suffix indicates a piston magnet for position sensing; the legacy SI used CS1-B/DS1-B switches, while the SAI family uses current AirTAC sensors. If sizing up or down, the 80mm bore yields 2513N push at 0.5MPa, and the 125mm bore yields 6136N. Because this is a 508mm stroke, prevent rod bending by using external guides to manage side loads. A plain cylinder drifts without live air; for load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X508S
- ✓ 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 SI100X508S FAQ
Yes, the SI100X508S is discontinued. The direct replacement is the AirTAC SAI100X508S. It is dimensionally interchangeable per ISO 15552, matching the 100mm bore, 508mm stroke, G1/2 port, and mounting fixtures.
The bore is 100mm with a G1/2 air port. Force output is 3927N push and 3681N pull at 0.5MPa, 5497N push at 0.7MPa, 7068N push at 0.9MPa, and a theoretical maximum of 801kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X508S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X508S replacement — usually within 7-8 hours.