Lockheed Martin Librascope Corporation · Electronic Components
B4040158
Heat Sink, Electrical
Part NumberB4040158
ManufacturerLockheed Martin Librascope Corporation
AvailabilityAvailable to order — request a quote
Specifications
NSN5999-01-246-0557 (NSN)
Federal Item NameHEAT SINK,ELECTRICAL-ELECTRONIC
Federal Supply Class5999 — Miscellaneous Electrical Components
MaterialALUMINUM ALLOY 6061
Overall Width2.950 INCHES NOMINAL
Surface Treatment Document And ClaMIL-C-5541,CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE
Overall Height0.145 INCHES NOMINAL
Surface TreatmentCHROMATE
Overall Length5.250 INCHES NOMINAL
Material Document And ClassificatiQQ-A-250/11 FED SPEC SINGLE MATERIAL RESPONSE
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 B4040158 available?
We can source B4040158 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 B4040158 by Lockheed Martin Librascope Corporation obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If B4040158 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 B4040158?
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 B4040158?
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.