Published on 1/1/2026 • Updated on 1/1/2026
RF Connector Selection Guide
For SMA, N-type, BNC, and TNC connectors, material choice influences mechanical stability, repeatable mating torque, corrosion resistance, and long-term RF consistency. Here’s a clear, engineer-oriented comparison for demanding applications.
See the Comparison Selection ChecklistAt RF, precision is often more about geometry, surface quality, and stability over time—not just bulk conductivity.
Tight tolerances and stable mating interfaces reduce drift in impedance, VSWR, and insertion loss over repeated cycles.
Hardness helps maintain thread dimensions, mating surfaces, and contact geometries—reducing deformation during repeated matings.
Passive oxide layer reduces oxidation and contact degradation, helping keep contact resistance more consistent over time.
Dimensional stability under stress/temperature helps preserve interface geometry—key for microwave and multi-GHz applications.
Better resistance to vibration loosening, temperature swings, moisture, and corrosive atmospheres— common in industrial, outdoor, and defense use.
Brass remains widely used because it’s cost-effective and conductive. It’s a strong fit when your application is low-duty and the environment is controlled.
Brass may offer better bulk conductivity, but stainless often provides better long-term geometric stability and corrosion resistance—especially when mating cycles and environmental stress increase.
Material choice depends on frequency, duty cycle, vibration exposure, and tolerance sensitivity.
| Connector Type | Typical Precision Use | Stainless Steel Advantage |
|---|---|---|
| SMA | Very high (multi-GHz / microwave) | Excellent for precision mating, torque stability, and repeatable geometry |
| BNC | Medium–low (often ≤ 4 GHz) | Useful where repeated mating is frequent and wear resistance matters |
| TNC | Medium–high (threaded, robust) | Threaded stainless helps prevent loosening under vibration |
| N-Type | Medium–high (outdoor, base stations) | Good for harsh environments and mechanical durability |
Use this guide to choose material based on duty cycle, environment, and frequency. For best results, validate with manufacturer specs (plating, torque, frequency rating) for the exact connector series.