This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100AX55S, 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 SI100AX55S
The AirTAC Airtac SI100 Standard Cylinder SI100AX55S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 55mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100AX55S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke55 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100AX55S
- 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 SI100AX55S
The AirTAC SI100AX55S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 55mm stroke. It delivers 3927N push force at 0.5MPa through a G1/2 port. The direct replacement is the SAI100AX55S, matching the bore, stroke, force, port, and ISO 15552 mounting interface.
The SAI upgrade features an improved 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. The -A rod is SUS420J2 stainless steel, and the -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI100 Standard Cylinder SI100AX55S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100AX55S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100AX55S |
| Bore size | Ø100 mm |
| Stroke | 55 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 SAI100AX55S 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 SAI100AX55S 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 SI100AX55S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×55 | 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 SI100AX55S Is Used
Heavy Press Clamping
Secures large metal workpieces in machining fixtures, utilizing the 3927N push force at 0.5MPa to hold firm against cutting loads.
Pallet Stopping
Acts as a robust stop gate for heavy loaded pallets on conveyor lines, absorbing kinetic energy with its adjustable 36mm air cushion.
Material Lowering
Controls the descent of 200kg payloads in vertical lift stations, relying on the SUS420J2 stainless rod for durability in demanding environments.
Replacing the Airtac SI100 Standard Cylinder SI100AX55S with the SAI100AX55S
To replace this SI100AX55S, order the SAI100AX55S. Verify the ISO 15552 mounting interface, 55mm stroke, G1/2 port, and the -S magnet for CS1-B/DS1-B switches. The SUS420J2 stainless rod (-A) suits corrosive environments. If sizing up or down, a 125mm bore offers 6136N push at 0.5MPa, while an 80mm bore provides 2513N. For load holding on air loss, note that a plain cylinder drifts; the cushion only decelerates. Use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Since the stroke is under 300mm, severe side-load risks are minimal, but standard guide considerations apply.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100AX55S
- ✓ 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 SI100AX55S FAQ
Yes, the SI100AX55S is discontinued. The direct replacement is the SAI100AX55S. It is dimensionally interchangeable per ISO 15552, matching the 100mm bore, 55mm stroke, output force, G1/2 port, and mounting interface.
This 100mm bore cylinder features a G1/2 port and delivers a push force of 3927N and pull of 3681N at 0.5MPa. At 0.7MPa push is 5497N, and 7068N at 0.9MPa. The theoretical max force is 801kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100AX55S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100AX55S replacement — usually within 7-8 hours.