Seastrom Manufacturing · Electronic Components
A121-55
Insulator, Bushing
Part NumberA121-55
ManufacturerSeastrom Manufacturing
AvailabilityAvailable to order — request a quote
Specifications
NSN5970-00-630-1605 (NSN)
Federal Item NameINSULATOR,BUSHING
Federal Supply Class5970 — Electrical Insulators
Shank Height0.020 INCHES MINIMUM AND 0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM0.030 INCHES MAXIMUM
Shank Outside Diameter0.333 INCHES MINIMUM AND 0.333 INCHES MINIMUM AND 0.343 INCHES MAXIMUM0.343 INCHES MAXIMUM
MaterialPLASTIC POLYAMIDE NYLON OVERALLPLASTIC POLYAMIDE NYLON OVERALL
Style DesignatorSHOULDERSHOULDER
Overall Height0.094 INCHES NOMINAL0.094 INCHES NOMINAL
Inside Diameter0.255 INCHES MINIMUM AND 0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM0.265 INCHES MAXIMUM
Outside Diameter0.500 INCHES MINIMUM AND 0.500 INCHES MINIMUM AND 0.516 INCHES MAXIMUM0.516 INCHES MAXIMUM
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 A121-55 available?
We can source A121-55 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 A121-55 by Seastrom Manufacturing obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If A121-55 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 A121-55?
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 A121-55?
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.