Eaton Corp. Opns & Technical Center · Electronic Components
21-256
Contact, Electrical
Part Number21-256
ManufacturerEaton Corp. Opns & Technical Center
AvailabilityAvailable to order — request a quote
Specifications
NSN5999-00-368-1054 (NSN)
Federal Item NameCONTACT,ELECTRICAL
Federal Supply Class5999 — Miscellaneous Electrical Components
Nominal Thread Size0.138 INCHES
Thread Series DesignatorUNIFIED NATIONAL COARSE (UNC)
Style DesignatorIRREGULAR SHAPE
Surface TreatmentCADMIUM BODY AND CONTACT
MaterialCOPPER ALLOY BODY AND CONTACT
Thread Quantity Per Inch32
Overall Width0.750 INCHES NOMINAL
Mounting Facility Quantity1
Thread DirectionRIGHT-HAND
Overall Length0.844 INCHES NOMINAL
Thread Class2B
Cancelled NSN5945-00-375-5186 (cancelled)
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 21-256 available?
We can source 21-256 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 21-256 by Eaton Corp. Opns & Technical Center obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 21-256 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 21-256?
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 21-256?
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.