This is one Lot (Qty.2) New DAA_SHEEN SMA Female 2-Hole Flange Panel Mount with Extended Dielectric, 50 OHM. Part Number: U27-SMA02-AG.  .

Here are the basic: 

Insulator length: 0.125" (3.1mm)

Pin length: 0.15" (3.8mm)

2-Hole Flange size: 0.63" x 0.236" (16 x 6mm)

Distance between mounting holes: 0.481" (12.2mm)

Data Sheet Drawing:

http://www.rfbayinc.com/upload/files/data_sheet/parts/u27-sma02.pdf

This is the SMA Female connector used in RF Bay, Inc. product and many designer kit in my eBay store.