MIL-SPEC · Electronic Components
MS21044C4
LOCKNUT,NYLON INSERT, 1/4"-28,SS
Part NumberMS21044C4
ManufacturerMIL-SPEC
AvailabilityIn stock — ships fast
Specifications
NSN5310-00-889-2589 (NSN)
Federal Item NameNUT,SELF-LOCKING,HEXAGON
MaterialSTEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 NUT
Nominal Thread Size0.250 INCHES
Bearing Surface Finish125.0 MICROINCHES
Surface TreatmentPASSIVATE OVERALL EXCEPT INSERT
Material Document And ClassificatiAMS 5688 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5640 ASSN STD 2ND MATERIAL RESPONSE OR AMS 5647 ASSN STD 3RD MATERIAL R
Countersink Angle88.0 DEGREES NOMINAL NUT
Thread Quantity Per Inch28
Width Across Flats0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM
Thread SeriesUNIFIED NATIONAL JOINT FINE (UNJF)
Temp Rating250.0 FAHRENHEIT NOMINAL
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 MS21044C4 in stock?
Yes — MS21044C4 is in our stock database. Request a quote for current pricing and lead time.
Is MS21044C4 by MIL-SPEC obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If MS21044C4 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 MS21044C4?
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 MS21044C4?
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.