Types of SMA connectors

NameInsulatorMaximum bandwidth, GHzIs comply withDescription
Precision 1mmAir, gap 1mm110only with 1mmMuch smaller than other
Precision 1,85mmAir, gap 1,85mm702,4mmThe outer thread size of the 1.85 and 2.4 connectors is bigger than SMA, 3.5, and 2.92. This makes the area of the outer conductor mating surface look very large compared to the relatively small air dielectric.
Precision 2,4mmAir, gap 2,4mm501,85mmmanufactured at Keysight
Precision 2,92mm (also named “K”)Air, gap 2,92mm403,5mm and SMA(regular) 
Precision 3,5mmAir, gap 3,5mmmm342,92mm and SMA(regular) 
SMA(regular)PTFE(Teflon)242,92mm and 3,5mmTeflon dielectric, also in reverse polarity version named as RP-SMA

Differences between SMA and RP-SMA:

SMA-RPSMA

Precision SMA Photos:

Precision SMA 3.5 mm
Precision SMA 2.92 mm
Precision SMA 2.4 mm
Precision SMA 1 mm
Precision SMA 1.85 mm

Regular SMA:

sma

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