Dwyer Instruments Inc. · Electronic Components
1638-2
Switch, Pressure
Part Number1638-2
ManufacturerDwyer Instruments Inc.
AvailabilityAvailable to order — request a quote
Specifications
NSN5930-01-187-8573 (NSN)
Federal Item NameSWITCH,PRESSURE
Federal Supply Class5930 — Switches
Style DesignatorCYLINDRICAL W/BRACKET
Inside Diameter0.250 INCHES NOMINAL ALL CONNECTIONS
Thread Series DesignatorNPT ALL PRESSURE CONNECTION
Longest Vertical Distance Between3.000 INCHES NOMINAL
Frequency In Hertz60.0 FIRST VOLTAGE
Unthreaded Mounting Hole Diameter0.281 INCHES NOMINAL
Nominal Thread Size0.125 INCHES ALL PRESSURE CONNECTION
Contact Load Current Rating15.0 AMPERES RESISTIVE LOAD FIRST VOLTAGE
Contact AdjustabilityACTUATION POINT ADJUSTABLE
Contact Action StimulusINCREASE
Nonpile Up Contact Arrangement1 POLE, DOUBLE THROW, BOTH POSITIONS MAINTAINED
Pole Quantity1
Overall Width1.000 INCHES NOMINAL
Switch TypeNONTRANSFER
Operating Temp Range-54.0 TO 105.0 CELSIUS
Overall Height0.420 INCHES NOMINAL
Overall Length1.200 INCHES NOMINAL
Throw Quantity2
Vendor Part Numbers312052-002
Cancelled NSN5985-01-385-1917 (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 1638-2 available?
We can source 1638-2 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 1638-2 by Dwyer Instruments Inc. obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 1638-2 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 1638-2?
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 1638-2?
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.