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Waveguide Flange Sizes & Types Reference Comprehensive Technical Data for Engineering & Production. Waveguide Standard Freq (GHz) Type Product Name Dimensions (Inch/mm) Drawing WR28 / WG22 R320 26.5 - 40.0 CBR WF-CBR-28-Flange Size 0.28"x0.14" (7.112x3.556mm) View PBR WF-PBR-28-Flange Size View UBR WF-UBR-28-Flange Size View WR34 / WG21 R260 22.0 - 33.0 UBR WF-UBR-34-Flange Size 0.34"x0.17" (8.636x4.318mm) View CBR WF-CBR-34-Flange Size View WR42 / WG20 R220 18.0 - 26.5 UDR WF-UBR-42-Flange Size 0.42"x0.17" (10.668x4.318mm) View PBR WF-PBR-42-Flange Size View CBR WF-CBR-42-Flange Size View WR51 / WG19 R180 15.0 - 22.0 PDR WF-PDR-51-Flange size 0.51"x0.255" (12.954x6.477mm) View PBR WF-PBR-51-Flange Size View UBR WF-UBR-51-Flange Size View UDR WF-UDR-51-Flange Size View CBR WF-CBR-51-Flange Size View WR62 / WG18 R140 12.4 - 18.0 PDR WF-PDR-62-Flange Size 0.622"x0.311" (15.7988x7.8994mm) View UBR WF-UBR-62-Flange Size View PBR WF-PBR-62-Flange Size View CBR WF-CBR-62-Flange Size View WR90 / WG16 R100 8.20 - 12.4 PDR WF-PDR-90-Flange Size 0.9"x0.4" (22.86x10.16mm) View PBR WF-PBR-90-Flange Size View UBR WF-UBR-90-Flange Size View CBR WF-CBR-90-Flange Size View WR137 / WG14 R70 5.85 - 8.20 UAR WF-UAR-137-Flange Size 1.372"x0.622" (34.8488x15.7988mm) View PAR WF-PAR-137-Flange Size View UDR WF-UDR-137-Flange Size View PDR WF-PDR-137-Flange Size View WR2300 / WG0.0 R3 0.32 - 0.49 UDR WF-UDR-2300-Flange Size 23"x11.5" (584.2x292.1mm) View