Eaton Aerospace · Electronic Components
21SN04-139
Switch, Pressure
Part Number21SN04-139
ManufacturerEaton Aerospace
AvailabilityAvailable to order — request a quote
Specifications
NSN5930-01-047-8916 (NSN)
Federal Item NameSWITCH,PRESSURE
Federal Supply Class5930 — Switches
Contact AdjustabilityACTUATION POINT ADJUSTABLE, PRESET
Overall Diameter2.000 INCHES NOMINAL
Nonpile Up Contact Arrangement1 POLE, DOUBLE THROW, BOTH POSITIONS MAINTAINED
Pressure Switch TypeABSOLUTE
Contact Action StimulusINCREASE
Contact Stimulus Rating2.50 DEACTUATION POINT NOMINAL POUNDS PER SQUARE INCH
Overall Length3.360 INCHES NOMINAL
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 21SN04-139 available?
We can source 21SN04-139 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 21SN04-139 by Eaton Aerospace obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 21SN04-139 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 21SN04-139?
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 21SN04-139?
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.