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These bnc to sma coaxial adapters are a very popular series of adapters. Our sma to bnc adapters are made with either brass or stainless steel sma's. Mil specs call out stainless steel sma's; though in the commercial world brass sma's are common; be carefull to not tighten brass sma nuts over 5 in-lbs when choosing brass bnc to sma adapters, the sma nut will come off at 8 in-lbs! These sma to bnc adapters are spec'd to 4Ghz.