This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100AX400S, 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 SI100AX400S
The AirTAC Airtac SI100 Standard Cylinder SI100AX400S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 400mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100AX400S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke400 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100AX400S
- 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 SI100AX400S
The AirTAC SI100AX400S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore, 400mm stroke, and a SUS420J2 stainless steel rod. Delivering 3927 N push force at 0.5 MPa, it is replaced by the SAI100AX400S. This direct upgrade matches the G1/2 port, M20x1.5 thread, and ISO 15552 mounting interface, fitting existing fixtures perfectly.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S magnet works with legacy CS1-B/DS1-B sensors, while a Viton H seal option raises operating temps to 150 C.
Airtac SI100 Standard Cylinder SI100AX400S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100AX400S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100AX400S |
| Bore size | Ø100 mm |
| Stroke | 400 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 SAI100AX400S 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 SAI100AX400S 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 SI100AX400S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×400 | 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 SI100AX400S Is Used
Heavy-Duty Pressing
Applies the 5497 N push force at 0.7 MPa to seat bearings and assemble heavy mechanical components securely.
Pallet Diversion
Uses the 400mm stroke and SUS420J2 stainless rod to push heavy pallets reliably across material handling lines.
Replacing the Airtac SI100 Standard Cylinder SI100AX400S with the SAI100AX400S
To replace the SI100AX400S, order the SAI100AX400S. Verify the ISO 15552 mounting interface, 400mm stroke, G1/2 port, and -S magnet for CS1-B/DS1-B switches. The SAI family adds SAIL, SAIF, and BSAI lock/valve variants. If sizing up or down, neighboring bores (80mm / 125mm) offer 2513 N or 6136 N push at 0.5 MPa. Note: a plain cylinder drifts on air loss; use SAIL/BSAI or an external pilot check valve for load holding. For the 400mm stroke, use external guides to prevent rod bending and side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100AX400S
- ✓ 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 SI100AX400S FAQ
Yes, the SI100AX400S is discontinued. The direct replacement is the SAI100AX400S. It is dimensionally interchangeable per ISO 15552, retaining the same 100mm bore, 400mm stroke, G1/2 port, and mounting interface.
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, with an operating speed of 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100AX400S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100AX400S replacement — usually within 7-8 hours.