This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X625S, 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 SI100X625S
The AirTAC Airtac SI100 Standard Cylinder SI100X625S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 625mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X625S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke625 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X625S
- 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 SI100X625S
The AirTAC SI100X625S is a discontinued double-acting ISO 15552 profile cylinder with a 625 mm stroke and a G1/2 port. Delivering 3927 N push force at 0.5 MPa, it is replaced by the SAI100X625S. This direct upgrade shares the exact ISO 15552 mounting interface, bore, and output force. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI variants the SI lacked.
Your -S model includes a piston magnet for CS1-B/DS1-B switches; the SAI replacement uses current AirTAC switches. Rod material options include carbon steel, SUS420J2 (A), or SUS304 (B). For high heat, Viton H seals raise the operating range to 0-150 C.
Airtac SI100 Standard Cylinder SI100X625S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X625S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X625S |
| Bore size | Ø100 mm |
| Stroke | 625 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 SAI100X625S 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 SAI100X625S 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 SI100X625S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×625 | 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 SI100X625S Is Used
Long-Stroke Material Transfer
Drives heavy pallets across 625 mm gaps in packaging lines, utilizing the 3927 N push force to overcome guide friction without stalling.
Large Fixture Actuation
Positions heavy welding fixtures or machining clamps, where the ISO 15552 interface ensures rigid mounting and repeatable accuracy.
Replacing the Airtac SI100 Standard Cylinder SI100X625S with the SAI100X625S
To replace this SI100X625S, order the SAI100X625S. Confirm the ISO 15552 mounting interface (LB, FA, CA, TC), the G1/2 port, and the M20x1.5 rod thread. The SAI is a direct. Sizing both ways: if you need less force, a bore 80 yields 2513 N push at 0.5 MPa; if you need more, a bore 125 yields 6136 N. Because the 625 mm stroke exceeds 300 mm, use an external guide to prevent rod bending and side-load wear. A plain cylinder does not hold load on air loss—the cushion only decelerates. For load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X625S
- ✓ 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 SI100X625S FAQ
Yes, the SI100X625S is discontinued. The direct replacement is the AirTAC SAI100X625S. It shares the same ISO 15552 mounting interface, 100 mm bore, 625 mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly.
At 0.5 MPa, push force is 3927 N and pull is 3681 N. At 0.7 MPa push is 5497 N, and at 0.9 MPa it is 7068 N. The theoretical max is 801 kgf at 1.0 MPa. Operating speed is 30-800 mm/s, with a 36 mm adjustable air cushion at both ends.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X625S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X625S replacement — usually within 7-8 hours.