This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X645S, 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 SI100X645S
The AirTAC Airtac SI100 Standard Cylinder SI100X645S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 645mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X645S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke645 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X645S
- 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 SI100X645S
The AirTAC SI100X645S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 645mm stroke. It delivers 3927N push force at 0.5MPa via a G1/2 port. AirTAC replaced this legacy unit with the SAI100X645S, a direct sharing the exact ISO 15552 mounting interface, stroke, and output force.
The SAI upgrade features a modernized piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL lock and BSAI clamp-lock variants absent in the SI line.
Airtac SI100 Standard Cylinder SI100X645S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X645S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X645S |
| Bore size | Ø100 mm |
| Stroke | 645 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 SAI100X645S 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 SAI100X645S 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 SI100X645S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×645 | 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 SI100X645S Is Used
Heavy Material Transfer
Drives robust pallet stops and heavy-gauge workpiece diverters on high-throughput automated conveyors requiring 3927N push force.
Large Assembly Press
Actuates heavy-duty clamping fixtures and press platens in automotive component assembly, relying on the 100mm bore profile barrel.
Replacing the Airtac SI100 Standard Cylinder SI100X645S with the SAI100X645S
To replace the SI100X645S, order the SAI100X645S. Confirm the ISO 15552 mounting interface (LB, FA, CA, TC), the G1/2 port, and the -S magnet for position sensing. Sizing checks: a neighboring 80mm bore yields 2513N push at 0.5MPa, while a 125mm bore yields 6136N. For loads requiring 5497N, operate at 0.7MPa. Because the 645mm stroke exceeds 300mm, use external guides to prevent rod bending and side-load damage. A plain cylinder drifts on air loss; for load holding, specify the SAIL or BSAI lock variant, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X645S
- ✓ 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 SI100X645S FAQ
Yes, the SI100X645S is discontinued. The direct replacement is the SAI100X645S. It shares the identical ISO 15552 mounting interface, 100mm bore, 645mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly.
The G1/2 port bore delivers a push of 3927N and pull of 3681N at 0.5MPa. At 0.7MPa push is 5497N, and 7068N at 0.9MPa. The theoretical maximum force is 801kgf at 1.0MPa. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X645S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X645S replacement — usually within 7-8 hours.