Lockheed Martin · Electronic Components
EFP1661-103
Waveguide Assembly
Part NumberEFP1661-103
ManufacturerLockheed Martin
AvailabilityAvailable to order — request a quote
Specifications
NSN5985-00-128-3614 (NSN)
Federal Item NameWAVEGUIDE ASSEMBLY
Federal Supply Class5985 — Antennas and Waveguides
Precious Material And LocationFLANGE SURFACE SILVER
Flange Inside Width0.622 INCHES NOMINAL ALL FLANGES
Waveguide Outside Height0.388 INCHES MINIMUM AND 0.394 INCHES MAXIMUM
Cross Sectional Shape StyleINTERNAL, RECTANGULAR EXTERNAL, RECTANGULAR
Flange Inside Diameter1.000 INCHES NOMINAL ALL FLANGES
Waveguide Outside Width0.699 INCHES MINIMUM AND 0.705 INCHES MAXIMUM
Waveguide Length4.000 INCHES NOMINAL
Flange StyleCHOKE TYPE ALL FLANGES
Surface TreatmentSILVER ALL FLANGE INSIDE SURFACES
Waveguide Inside Width0.620 INCHES MINIMUM AND 0.624 INCHES MAXIMUM
Flange Depth0.375 INCHES NOMINAL ALL FLANGES
RH Electronics, Inc. — independent stocking distributor since 1982.
Every shipment inspected on receipt · ISO 9001:2015 · ANSI/ESD S20.20 · ERAI member since 1998 · GIDEP participant
Every shipment inspected on receipt · ISO 9001:2015 · ANSI/ESD S20.20 · ERAI member since 1998 · GIDEP participant
Frequently asked
Is EFP1661-103 available?
We can source EFP1661-103 even if it isn't in our active stock list. As an independent distributor we reach inventory outside the franchise channel — including hard-to-find and obsolete parts. Send us a quote request.
Is EFP1661-103 by Lockheed Martin obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If EFP1661-103 has been discontinued, we can often source remaining stock or qualified alternates. Contact us with your quantity and target date.
How does RH Electronics verify parts like EFP1661-103?
Every incoming shipment is inspected under our ISO 9001:2015 quality system — documentation, markings, and construction checked against known-good references. For deeper analysis, we direct work through accredited independent labs. We've been an ERAI member since 1998 and a GIDEP participant.
Can you find a cross-reference or alternate for EFP1661-103?
Yes. Our team reads part numbers the way they were designed — decoding family, speed, temperature grade, package, and reliability level — to identify acceptable alternates when the exact part isn't available. Submit a quote request and we'll advise.