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Catalog / Department Of The Army Hq United States Army Communications Research And Development Command / B4021990
Department Of The Army Hq United States Army Communications Research And Development Command · Electronic Components
B4021990
Heat Sink, Electrical
Part NumberB4021990
ManufacturerDepartment Of The Army Hq United States Army Communications Research And Development Command
AvailabilityAvailable to order — request a quote
Specifications
NSN5999-01-218-8455 (NSN)
Federal Item NameHEAT SINK,ELECTRICAL-ELECTRONIC
Federal Supply Class5999 — Miscellaneous Electrical Components
Surface TreatmentNICKEL
Overall Length8.620 INCHES NOMINAL
Overall Width3.510 INCHES NOMINAL
Unthreaded Mounting Hole Diameter1.000 INCHES NOMINAL SINGLE MOUNTING FACILITY
Overall Height0.520 INCHES NOMINAL
Surface Treatment Document And ClaMIL-C-26074,CLASS 4,GRADE A MIL SPEC SINGLE TREATMENT RESPONSE
Mounting Facility Type And Quantit2 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY
Vendor Part NumbersL211000155
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 B4021990 available?
We can source B4021990 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 B4021990 by Department Of The Army Hq United States Army Communications Research And Development Command obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If B4021990 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 B4021990?
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 B4021990?
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.