This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100AX50S, 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 SI100AX50S
The AirTAC SI100 Standard Cylinder SI100AX50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 50mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100AX50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100AX50S
- 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 SI100AX50S
The AirTAC SI100AX50S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 50mm stroke. Built with an extruded aluminum barrel, it delivers 3927 N push and 3681 N pull at 0.5 MPa through a G1/2 port. AirTAC replaced this legacy unit with the SAI100AX50S, a direct replacement sharing the exact ISO 15552 mounting interface, M20x1.5 rod thread, and 36mm cushions.
The SAI upgrade features a modernized piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. This specific SI100AX50S variant includes the -A SUS420J2 stainless steel rod for corrosion resistance and the -S magnet for legacy CS1-B/DS1-B sensors. Note that the SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line.
Airtac SI100 Standard Cylinder SI100AX50S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100AX50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100AX50S |
| Bore size | Ø100 mm |
| Stroke | 50 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 SAI100AX50S 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 SAI100AX50S 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 SI100AX50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×50 | 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 SI100AX50S Is Used
Heavy-Duty Pressing
Drives robust clamping and pressing actions in automated machinery, utilizing the 3927 N push force at 0.5 MPa to secure heavy components during machining.
Pallet Diversion
Actuates heavy-duty diverter arms on conveyor lines, where the 200 kg vertical lift capacity and 100mm bore handle substantial pallet loads easily.
Stainless Rod Washdown
Ideal for damp or washdown manufacturing environments requiring the SUS420J2 stainless piston rod option to resist corrosion over long service cycles.
Replacing the Airtac SI100 Standard Cylinder SI100AX50S with the SAI100AX50S
To replace the discontinued SI100AX50S, order the SAI100AX50S. Confirm your ISO 15552 mounting fixtures (LB, FA, CA, TC, etc.), the 50mm stroke, G1/2 port, and the -S magnet requirement. The SAI accepts current AirTAC switches, whereas the legacy SI used CS1-B/DS1-B sensors. If sizing up or down, neighboring bores are 80mm (2513 N push @0.5 MPa) and 125mm (6136 N push @0.5 MPa). Because this is a plain cylinder, it will not hold a load without live air; the cushions only decelerate. For fail-safe load holding, consider an external pilot check valve or upgrade to the SAIL or BSAI lock variant. The 50mm stroke is well within standard limits, so no side-load guide concerns apply here.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100AX50S
- ✓ 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 SI100AX50S FAQ
Yes, the SI100AX50S is discontinued. The direct replacement is the SAI100AX50S. It shares the identical ISO 15552 mounting interface, 100mm bore, 50mm stroke, output force, G1/2 port, and M20x1.5 rod thread, fitting directly into your existing fixtures.
This 100mm bore cylinder features a G1/2 air port. The thrust ratings are: 3927 N push and 3681 N pull at 0.5 MPa; 5497 N push at 0.7 MPa; 7068 N push at 0.9 MPa; and a theoretical maximum force of 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100AX50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100AX50S replacement — usually within 7-8 hours.