MIL-SPEC · Electronic Components
MS21043-5
NUT LOCKING 5/16-24
Part NumberMS21043-5
ManufacturerMIL-SPEC
AvailabilityIn stock — ships fast
Specifications
NSN5310-00-881-0944 (NSN)
Federal Item NameNUT,SELF-LOCKING,EXTENDED WASHER
MaterialIRON ALLOY 660 OVERALL
Overall Height0.251 INCHES MINIMUM AND 0.266 INCHES MAXIMUM
Precious Material LocationEXTERNAL SURFACE SILVER
Nominal Thread Size0.312 INCHES
Washer Thickness0.023 INCHES MINIMUM
Surface TreatmentSILVER OVERALL
Thread DirectionRIGHT-HAND
Surface Treatment Document And ClaQQ-S-365 FED SPEC SINGLE TREATMENT RESPONSE OR AMS 2410 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
Material Document And ClassificatiAMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
Width Across Flats0.367 INCHES MINIMUM AND 0.378 INCHES MAXIMUM
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 MS21043-5 in stock?
Yes — MS21043-5 is in our stock database. Request a quote for current pricing and lead time.
Is MS21043-5 by MIL-SPEC obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If MS21043-5 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 MS21043-5?
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 MS21043-5?
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.