Important: This guide explains common sourcing terminology. It does not confirm compatibility with a specific faucet or market standard.
What M22 and M24 Usually Describe
The letter M refers to a metric thread. The number generally refers to the nominal thread diameter in millimeters. M22 and M24 are widely used labels, but buyers must also distinguish between internal and external threads.
| Label | Typical sourcing question |
|---|---|
| M22 | Is the aerator internally or externally threaded, and what is the measured diameter? |
| M24 | Does the faucet spout use the matching thread position and pitch? |
| Other | Is an adapter, special housing, or concealed aerator key required? |
What to Measure
- Outside or inside thread diameter.
- Whether the aerator has male or female threads.
- Available installation depth.
- Washer and sealing arrangement.
- Required tool or key for concealed formats.
What to Specify Beyond Size
Thread compatibility is only one part of the product brief. Also define the intended flow range, stream pattern, housing and insert material, finish, packaging, expected quantity, and target-market documentation.
Best next step
Send clear close-up photos, measurements, the faucet application, and target quantity. A physical sample is the safest reference when compatibility is critical.