Illinois Tool Works · Electronic Components
18-40421
Switch, Sensitive
Part Number18-40421
ManufacturerIllinois Tool Works
LifecycleStocked
AvailabilityAvailable to order — request a quote
Specifications
NSN5930-00-123-9982 (NSN)
Federal Item NameSWITCH,SENSITIVE
Federal Supply Class5930 — Switches
Contact Load Current Rating At Max4.000 AMPERES RESISTIVE DC AND 3.000 AMPERES INDUCTIVE DC AND 4.000 AMPERES RESISTIVE AC AND 3.000 AMPERES INDUCTIVE AC
Nonpile Up Contact Arrangement1 TWO CIRCUIT, DOUBLE BREAK/DOUBLE MAKE, ONE POSITION MOMENTARY SINGLE SWITCH UNIT
Switch Release Force1.5 OUNCES MINIMUM
Mounting MethodTHREADED HOLE(S)
Inclosure TypeFULLY INCLOSED
Maximum Voltage Rating In Volts250.0 AC AND 28.0 DC
Actuator StyleROUND
Unthreaded Mounting Hole Diameter0.088 INCHES NOMINAL
Actuator Free Position Height0.355 INCHES NOMINAL
Actuator Diameter0.093 INCHES NOMINAL
Body Length0.510 INCHES NOMINAL
Vendor Part Numbers168519-1
Cancelled NSN5930-01-237-7189 (cancelled)
Wire Size Awg28AWG to 16AWG
RohscompliantY-EX
Wire Connection MethodScrew
Hazardousfalse
RohsphthalatescompliantYES
Rated Current8 A
Product RangeMC
IscanonicalY
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 18-40421 available?
We can source 18-40421 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 18-40421 by Illinois Tool Works obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 18-40421 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 18-40421?
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 18-40421?
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.