APEM Components · Electronic Components
U639
SWITCH HARDWARE
Part NumberU639
ManufacturerAPEM Components
AvailabilityAvailable to order — request a quote
Specifications
NSN4920-00-561-1476 (NSN)
Federal Item NameHOLDER,UNIT
Federal Supply Class4920 — Aircraft Maintenance And Repair Shop Specialized Equipment
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 U639 available?
We can source U639 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 U639 by APEM Components obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If U639 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 U639?
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 U639?
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.