L3Harris Technologies, Inc. · Electronic Components
255989-1
Heat Sink-Insulator
Part Number255989-1
ManufacturerL3Harris Technologies, Inc.
AvailabilityAvailable to order — request a quote
Specifications
NSN5999-01-415-6848 (NSN)
Federal Item NameHEAT SINK-INSULATOR
Federal Supply Class5999 — Miscellaneous Electrical Components
Mounting Facility Type And Quantit41 UNTHREADED HOLE(S) FIRST MOUNTING FACILITY
Body StyleBOARD MOUNTEDBOARD MOUNTED
Overall Length8.660 INCHES NOMINAL8.660 INCHES NOMINAL
Unthreaded Mounting Hole Diameter0.056 INCHES NOMINAL FIRST MOUNTING FACILITY
Material Document And ClassificatiMIL-P-46112 MIL SPEC SINGLE MATERIAL RESPONSE
Overall Width0.002 INCHES NOMINAL0.002 INCHES NOMINAL
Overall Height5.640 INCHES NOMINAL5.640 INCHES NOMINAL
MaterialPLASTIC POLYAMIDE NYLON
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 255989-1 available?
We can source 255989-1 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 255989-1 by L3Harris Technologies, Inc. obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 255989-1 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 255989-1?
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 255989-1?
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.