NSN 5999-01-657-1577 · NIIN 016571577 · Part number BU-49-5
Mueller Electric Company, Inc. Div Mueller Electric Company · FSC 5999 — Miscellaneous Electrical and Electronic Components · FSG 59 — Electrical and Electronic Equipment Components · CAGE 76545
Government record, cited
NSN 5999-01-657-1577 — this item is cataloged by the U.S. Government under National Stock Number 5999-01-657-1577. Manufacturer of record part number: BU-49-5.
Also searched as5999-01-657-1577 ·
5999016571577 ·
NIIN 016571577 ·
01-657-1577 ·
FSC 5999 Miscellaneous Electrical and Electronic Components · CAGE 76545 · BU-49-5
Manufacturer of record: Mueller Electric Company, Inc. Div Mueller Electric Company
Identification
NSN: 5999-01-657-1577
NIIN: 016571577
FSC: 5999 — Miscellaneous Electrical and Electronic Components
FSG: 59 — Electrical and Electronic Equipment Components
Primary part number: BU-49-5
Manufacturer: Mueller Electric Company, Inc. Div Mueller Electric Company
General Description
The Heat Sink-Insulator, cataloged under National Stock Number 5999-01-657-1577, is classified within Federal Supply Class 5999 (Miscellaneous Electrical and Electronic Components) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Mueller Electric Company, Inc. Div Mueller Electric Company. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active. Unit of issue: EA.
Catalog Facts
Item Name
Heat Sink-Insulator
FSC / FSG
5999 — Miscellaneous Electrical and Electronic Components (FSG 59)
Manufacturers
Mueller Electric Company, Inc. Div Mueller Electric Company (CAGE 76545)
Technical Specifications
Parameter
Value
NSN
5999-01-657-1577
Primary Part Number
BU-49-5
Item Name
Heat Sink-Insulator
FSC / FSG
5999 / 59 — Miscellaneous Electrical and Electronic Components
Manufacturer
Mueller Electric Company, Inc. Div Mueller Electric Company
Status
ACTIVE
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
Possible hazard — SDS may be required (DLA HMIC P)
Mueller Electric Company, Inc. Div Mueller Electric Company (USA)
No interchangeability data on file.
Other items in FSC 5999 — Miscellaneous Electrical and Electronic Components
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5999-00-001-1345
5999-00-001-1345 · Item name not on file
5999-00-001-1346
5999-00-001-1346 · Item name not on file
5999-00-001-1348
5999-00-001-1348 · Item name not on file
5999-00-001-1349
5999-00-001-1349 · Item name not on file
5999-00-001-1355
5999-00-001-1355 · Item name not on file
5999-00-001-1623
5999-00-001-1623 · Item name not on file
5999-00-001-2537
5999-00-001-2537 · Item name not on file
5999-00-001-2539
5999-00-001-2539 · Item name not on file
Frequently Asked Questions
What is NSN 5999-01-657-1577?
NSN 5999-01-657-1577 is a Heat Sink-Insulator, manufactured by Mueller Electric Company, Inc. Div Mueller Electric Company, classified under FSC 5999, Miscellaneous Electrical and Electronic Components. Status: active.
What part numbers are listed for NSN 5999-01-657-1577?
NSN 5999-01-657-1577 has 1 manufacturer part number on file: BU-49-5 (Mueller Electric Company, Inc. Div Mueller Electric Company).
Is NSN 5999-01-657-1577 hazardous material?
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.