MIL-SPEC · Electronic Components
MS21042L04
#4-40 self locking hex nut
Part NumberMS21042L04
ManufacturerMIL-SPEC
AvailabilityIn stock — ships fast
Specifications
NSN5310-00-807-1471 (NSN)
Federal Item NameNUT,SELF-LOCKING,EXTENDED WASHER
MaterialSTEEL OVERALL
Overall Height0.103 INCHES MINIMUM AND 0.125 INCHES MAXIMUM
Special FeaturesCRITICAL FEATURES,TOLERANCES,FIT RESTRICTIONS,MATERIAL PROPERTIES AND MANUFACTURING PROCESS
Nominal Thread Size0.112 INCHES
Criticality Code JustificationFEAT
Thread Quantity Per Inch40
Thread DirectionRIGHT-HAND
Thread SeriesUNJC
Temp Rating450.0 FAHRENHEIT NOMINAL
Thread Class3B
Federal Supply Class5310 — Nuts And Washers
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 MS21042L04 in stock?
Yes — MS21042L04 is in our stock database. Request a quote for current pricing and lead time.
Is MS21042L04 by MIL-SPEC obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If MS21042L04 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 MS21042L04?
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 MS21042L04?
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.