MIL-SPEC · Electronic Components
NAS4121-373B
Heat Sink, Electrical
Part NumberNAS4121-373B
ManufacturerMIL-SPEC
AvailabilityAvailable to order — request a quote
Specifications
NSN5999-01-474-4007 (NSN)
Federal Item NameHEAT SINK,ELECTRICAL-ELECTRONIC
Federal Supply Class5999 — Miscellaneous Electrical Components
Mounting Facility Type And Quantit2 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY
Material Document And ClassificatiQQ-A-200 FED STD SINGLE MATERIAL RESPONSE OR QQ-A-250 FED STD SINGLE MATERIAL RESPONSE
Unthreaded Mounting Hole Diameter0.152 INCHES NOMINAL SINGLE MOUNTING FACILITY
Surface TreatmentANODIZE
Body StyleBOARD MOUNTED
Overall Height0.750 INCHES NOMINAL
Surface Treatment Document And ClaMIL-A-8625 TYPE 1 OR 2 MIL SPEC SINGLE TREATMENT RESPONSE
MaterialALUMINUM ALLOY 3003 OR ALUMINUM ALLOY 5052 OR ALUMINUM ALLOY 1100 OR ALUMINUM ALLOY 2024 OR ALUMINUM ALLOY 6061 OR ALUMI
Overall Width1.062 INCHES NOMINAL
Overall Length1.560 INCHES NOMINAL
ESD/EMICode A — ESD/EMI sensitive item
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 NAS4121-373B available?
We can source NAS4121-373B 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 NAS4121-373B by MIL-SPEC obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If NAS4121-373B 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 NAS4121-373B?
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 NAS4121-373B?
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.