Avionics Specialties, Inc. · Electronic Components
104-257
Insulator, Washer
Part Number104-257
ManufacturerAvionics Specialties, Inc.
LifecycleStocked
AvailabilityAvailable to order — request a quote
Specifications
NSN5970-00-193-5258 (NSN)
Federal Item NameINSULATOR,WASHER
Federal Supply Class5970 — Electrical Insulators
Outside Diameter0.562 INCHES NOMINAL
Style DesignatorROUND, FLAT
Material Document And ClassificatiMIL-P-997-CANCELLED/REPLACED BY MIL SPEC SINGLE MATERIAL RESPONSE OR MIL-I-24768/17 MIL SPEC SINGLE MATERIAL RESPONSE O
MaterialGLASS AND RESIN SILICONE OVERALL
Inside Diameter0.187 INCHES NOMINAL
Overall Height0.006 INCHES NOMINAL
For Use WithMTE Contacts
ProducttraceabilityNo
RohscompliantYES
No Of Positions8 Positions
Product RangeMTE
IscanonicalY
Hazardousfalse
Pitch Spacing2.54 mm
GenderReceptacle
RohsphthalatescompliantYES
UseccnEAR99
SvhcNo SVHC (04-Feb-2026)
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 104-257 available?
We can source 104-257 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 104-257 by Avionics Specialties, Inc. obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 104-257 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 104-257?
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 104-257?
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.