Electroswitch · Electronic Components
121903LY
Switch, Rotary
Part Number121903LY
ManufacturerElectroswitch
AvailabilityAvailable to order — request a quote
Specifications
NSN5930-00-581-5508 (NSN)
Federal Item NameSWITCH,ROTARY
Federal Supply Class5930 — Switches
Individual Section Quantity3
Thread Series DesignatorUNIFIED NATIONAL COARSE (UNC) SINGLE MOUNTING FACILITY
Nominal Thread Size0.190 INCHES SINGLE MOUNTING FACILITY
Overall Length2.906 INCHES NOMINAL
Switch Contact Basic DesignNONPILE-UP NONSYMMETRICAL
Knob Manufacturer Code82121
Features ProvidedACTUATOR KNOB
Mounting Facility PatternFOUR POSITION CIRCULAR SINGLE MOUNTING FACILITY
Switch Actuator Indexing Position3 SINGLE ACTUATOR
Switch Actuator Stop Device TypeFIXED STOP SINGLE ACTUATOR
Style DesignatorTAP, CIRCUIT SELECTOR
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 121903LY available?
We can source 121903LY 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 121903LY by Electroswitch obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 121903LY 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 121903LY?
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 121903LY?
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.