This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100AX55, 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 SI100AX55
The AirTAC SI100 Standard Cylinder SI100AX55 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 SAI100AX55, 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 → SAI100AX55
- 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 SI100AX55
The AirTAC SI100AX55 is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 55mm stroke, delivering 3927N of push force at 0.5MPa. It features a Ø25mm SUS420J2 stainless piston rod, M20x1.5 thread, and a G1/2 air port. Because this SKU lacks a magnet (-S), it cannot accept position switches.
The direct replacement is the SAI100AX55. It shares the exact ISO 15552 mounting interface, output force, and porting, but upgrades to a two-piece Y-shaped piston seal for lower start-up pressure. The SAI family also introduces SAIL, SAIF, and BSAI lock/valve variants absent from the legacy line. For load holding, note the cushion only decelerates; use an external rod lock or pilot check valve.
Airtac SI100 Standard Cylinder SI100AX55 Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100AX55 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100AX55 |
| 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 SAI100AX55 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 SAI100AX55 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 SI100AX55
| 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 SI100AX55 Is Used
Press Fit Assembly
Drives heavy-duty bushings and bearings into automotive housings using its 3927N thrust at 0.5MPa, with the SUS420J2 rod resisting coolant corrosion.
Pallet Dampening
Acts as a short-stroke shock absorber in end-of-line packaging stations, decelerating heavy 200kg vertical loads via its 36mm adjustable air cushion.
Clamp Actuation
Secures large steel plates for robotic welding, providing the necessary 3681N pull force to hold workpieces firmly against fixture stops.
Replacing the Airtac SI100 Standard Cylinder SI100AX55 with the SAI100AX55
To replace the SI100AX55, order the SAI100AX55 and verify your ISO 15552 mounting interface (LB, FA, TC, etc.), G1/2 port thread (PT/G/NPT), and 55mm stroke. This unit has an SUS420J2 stainless rod (-A) and no magnet, meaning it cannot support legacy CS1-B/DS1-B sensors. If sensing is required, specify an SAI100X55S. If undersizing, a 80mm bore yields 2513N push; if oversizing, a 125mm bore yields 6136N. For any load holding on air loss, select the SAIL or BSAI lock variant instead of relying on the cushion.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100AX55
- ✓ 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 SI100AX55 FAQ
Yes, the AirTAC SI100AX55 is discontinued. The direct replacement is the SAI100AX55. It is dimensionally interchangeable per ISO 15552, retaining the same 100mm bore, 55mm stroke, G1/2 port, and mounting accessories, but adds an upgraded two-piece Y-shaped piston seal.
This double-acting cylinder has a G1/2 air port. At 0.5MPa it provides 3927N push and 3681N pull force. At 0.7MPa push is 5497N, and at 0.9MPa it is 7068N. The theoretical maximum force is 801kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100AX55
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100AX55 replacement — usually within 7-8 hours.