Birnbach · Electronic Components
478
Insulator, Feedthru
Part Number478
ManufacturerBirnbach
AvailabilityAvailable to order — request a quote
Specifications
NSN5970-00-284-8078 (NSN)
Federal Item NameINSULATOR,FEEDTHRU
Federal Supply Class5970 — Electrical Insulators
Thread Length2.500 INCHES NOMINAL CENTER STUD2.500 INCHES NOMINAL
Height Above Mounting Surface1.000 INCHES NOMINAL
Center Stud Length2.500 INCHES NOMINAL
Style DesignatorDOUBLE, BOWL
Thread LocationCENTER STUD
Shank Outside Diameter0.416 INCHES NOMINAL
Outside Diameter0.812 INCHES NOMINAL
Identification Code ColorWHITE
Screw Thread Quantity Per Inch And32 CENTER STUD
Thread Class And Location2A CENTER STUD
Surface FinishGLAZED OVERALL
Vendor Part NumbersGT800AW1
Cancelled NSN5970-00-378-3371 (cancelled)
Mounting Bolt Circle Diameter4.125 INCHES NOMINAL
Meter Body Diameter Behind Mountin3.625 INCHES NOMINAL
Indicator TypeDIAL W/POINTER
Movement Suspension MethodJEWEL PIVOT BASE
Special MarkingsO TO 25.5 RED SLASH,25.5 TO 26.0 SOLID GREEN SLASH,26.0 TO 38.2 RED SLASH,38.2 TO 39.0 SOLID GREEN SLASH,39.0 TO 50.0 RE
ColorUNABLE TO DECODE
Nuclear Hardness Critical FeatureNONHARDENED
FSC Application DataTEST SET ELECTRONIC
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 478 available?
We can source 478 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 478 by Birnbach obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 478 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 478?
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 478?
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.