Herley Chicago · Electronic Components
571981
Relay, Electromagnetic
Part Number571981
ManufacturerHerley Chicago
AvailabilityAvailable to order — request a quote
Specifications
NSN5945-00-502-4440 (NSN)
Federal Item NameRELAY,ELECTROMAGNETIC
Federal Supply Class5945 — Relays and Solenoids
Overall Length1.560 INCHES NOMINAL
Main Contact Maximum Voltage Ratin50.0 DC
Center To Center Distance Between1.062 INCHES NOMINAL SINGLE MOUNTING FACILITY
Nominal Operating Current Rating A20.0 MILLIAMPERES DC SINGLE WINDING
Mounting Facility PatternIN-LINE SINGLE MOUNTING FACILITY
Nominal Thread Size0.138 INCHES SINGLE MOUNTING FACILITY
Winding Quantity1
Environmental ProtectionHERMETIC
Thread Class2A SINGLE MOUNTING FACILITY
Overall Width1.000 INCHES NOMINAL
Thread Quantity Per Inch32 SINGLE MOUNTING FACILITY
Vendor Part NumbersG56478
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 571981 available?
We can source 571981 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 571981 by Herley Chicago obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 571981 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 571981?
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 571981?
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.