EIA & IEC Waveguide Flanges and WR Size Guide

Dolph Microwave

EIA & IEC Waveguide Flanges

Use the WR and R designations to find the waveguide size, then check the complete flange code. The reference table keeps the European and North American flange styles side by side.

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EIA & IEC Waveguide Flanges · View full-size photo

Designation systems: EIA / IEC
Waveguide references: WR / R
Interface options: Flat / grooved

Before you order

What needs to match at the joint?

Aperture and height

Confirm the internal opening and whether the waveguide is full-height or reduced-height. The standard size name alone does not cover every custom interface.

Bolt pattern and mating face

Include the hole positions, flange outline and cover/grooved face. A clear drawing avoids relying on a partial flange name.

Material and seal

The source describes Aluminum 6061-T6 and custom groove options. State whether the assembly also needs a gasket, alignment pins or other mating hardware.

The EIA and IEC flange size guide explains designation and fit checks. For a thin interface component, compare waveguide flange shims.

Waveguide Gasket, Die Cut · Separate product option

For the rest of your setup

Specify the gasket with the flange

If the joint requires a seal, choose the gasket material and profile around the actual mating face. Pressure-only sealing and combined RF/pressure sealing call for different choices.

Compare die-cut waveguide gaskets

Technical data

Specifications & dimensions

Swipe or scroll across the table to see all columns.

EIA / IEC waveguide and flange reference
Frequency Range (GHz)	EIA Std.	IEC Std.	European IEC Standard Flanges								North American EIA Standard Flanges
			A-Style Round Flange			B-Style Square Flange		D-Style Rectangular Flange		E-Style Small Rectangular	B-Style Square Flange			D-Style Rectangular Flange		E-Style Small Rectangular	UG-Style
			UAR	PAR	CAR	UBR	PBR	UDR	PDR	UER	SQ. COVER	SQ.COVER GROOVED	SQ. CHOKE	CPRF	CPRG	CMR	UG
0.76-1.15	WR975	R9												CPR975F	CPR975G
0.96-1.46	WR770	R12												CPR770F	CPR770G
1.13-1.73	WR650	R14												CPR650F	CPR650G		UG417A/U
1.45-2.2	WR510	R18												CPR510F	CPR510G
1.72-2.61	WR430	R22												CPR430F	CPR430G		UG435/U
2.17-3.3	WR340	R26						UDR26	PDR26					CPR340F	CPR340G
2.6-3.95	WR284	R32	UAR32	PAR32	CAR32			UDR32	PDR32	UER32	UG-COVER	GROOVED	UG-CHOKE	CPR284F	CPR284G		UG53/U
3.22-4.9	WR229	R40	UAR40	PAR40	CAR40			UDR40	PDR40	UER40				CPR229F	CPR229G	CMR229
3.94-5.99	WR187	R48	UAR48	PAR48	CAR48			UDR48	PDR48	UER48	UG-COVER	GROOVED	UG-CHOKE	CPR187F	CPR187G	CMR187	UG149/U
4.64-7.05	WR159	R58	UAR58	PAR58	CAR58			UDR58	PDR58	UER58				CPR159F	CPR159G
5.38-8.17	WR137	R70	UAR70	PAR70	CAR70			UDR70	PDR70	UER70	UG-COVER	GROOVED	UG-CHOKE	CPR137F	CPR137G	CMR137	UG344/U
6.57-9.99	WR112	R84				UBR84	PBR84	UDR84	PDR84	UER84	UG-COVER	GROOVED	UG-CHOKE	CPR112F	CPR112G	CMR112	UG51/U
7.0-11.0	WR102					UBR102	PBR102	UDR102	PDR102	UER100	UG-COVER	GROOVED	UG-CHOKE
8.2-12.5	WR90	R100				UBR100	PBR100	UDR100	PDR100		UG-COVER	GROOVED	UG-CHOKE	CPR90F	CPR90G	CMR90	UG39/U
9.84-15	WR75	R120				UBR120	PBR120	UDR120	PDR120		UG-COVER	GROOVED	UG-CHOKE	CPR75F	CPR75G
11.9-18	WR62	R140				UBR140	PBR140	UDR140	PDR140		UG-COVER	GROOVED	UG-CHOKE				UG419/U
14.5-22	WR51	R180				UBR180	PBR180	UDR180	PDR180		UG-COVER	GROOVED	UG-CHOKE
17.6-26.7	WR42	R220				UBR220	PBR220				UG-COVER	GROOVED	UG-CHOKE				UG595/U
21.7-33	WR34	R260				UBR260	PBR260				UG-COVER	GROOVED	UG-CHOKE				UG1530
26.3-40	WR28	R320				UBR320	PBR320				UG-COVER	GROOVED	UG-CHOKE				UG599/U
32.9-50.1	WR22	R400									UG-COVER	GROOVED	UG-CHOKE				UG383/U
39.2-59.6	WR19	R500															UG383/U
49.8-75.8	WR15	R620															UG385/U
60.5-91.9	WR12	R740															UG387/U
73.8-112	WR10	R900															UG387/U
92.2-140	WR8	R1200															UG387/U
113-173	WR6	R1400															UG387/U
145-220	WR5	R1800															UG387/U
172-261	WR4	R2200															UG387/U
217-330	WR3	R2600															UG387/U
325-500	WR2																UG387/U
750-1100	WR1																UG387/U

Materials & ordering options

Described material: Aluminum 6061-T6
Specialized types: CPRF, CPRG, SLAC, DESY, LIL
Mechanical options: Custom grooves; half-height / reduced-height interfaces
Installation accessories: Alignment pins and EMI gaskets

Technical documents

High Power TerminationPDF · High-power load reference — open PDF Flange Type DesignationsPDF · Interface reference — open PDF

Questions before ordering

Will any two WR75 flanges connect?

The WR designation describes the waveguide size. The mating flange code, bolt pattern, aperture height and face geometry still need to agree.

Can you quote a non-standard flange?

Send a dimensioned drawing with the material, surface finish, mating part and operating conditions. The custom interface can then be reviewed as a specific part.