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709-8540939 ITEM 021-2D4 — Technical Data Sheet

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— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The NUT,SELF-LOCKING,HEXAGON is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System under NSN 5310-01-677-9671, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
709-8540939 ITEM 021-2D4
NSN: 5310-01-677-9671
FSC: 5310
CAGE: 03950 — NAVAL INVENTORY CONTROL POINT MECHANICSBURG (USA)
SPECIFICATIONS
Part Number709-8540939 ITEM 021-2D4
NSN5310-01-677-9671
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 709-8540939 ITEM 021-2D4 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
MIL-DTL-1222,TYI,GR400L1InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
1/2-13UNC-2A X 1 3/4INL1InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
MIL-DTL-1222,TYI,GR400InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
1/2-13UNC-2A X 3L1InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
1/2-13UNC-2A X 3InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
845-4788655 ITEM 16L1InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 709-8540939 ITEM 021-2D4?
709-8540939 ITEM 021-2D4 is a NUT,SELF-LOCKING,HEXAGON.
What parts can replace 709-8540939 ITEM 021-2D4?
There are 18 known substitutes for 709-8540939 ITEM 021-2D4: MIL-DTL-1222,TYI,GR400L1, 1/2-13UNC-2A X 1 3/4INL1, MIL-DTL-1222,TYI,GR400 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 709-8540939 ITEM 021-2D4?
709-8540939 ITEM 021-2D4 is cataloged in the Federal Logistics Information System under NSN 5310-01-677-9671. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: September 2026