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Technical Data Sheet
PartsTable / COMPONENT / 0.4375 TYPE A NARROW
0.4375 TYPE A NARROW ✓ Verified by PartsTable
— · 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 0.4375 TYPE A NARROW 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 (FLIS) under NSN 5310-01-649-8085, 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
0.4375 TYPE A NARROW
NSN: 5310-01-649-8085
FSC: 5310
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
Part Number0.4375 TYPE A NARROW
NSN5310-01-649-8085
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 0.4375 TYPE A NARROW · 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 22
MIL-DTL-1222 TYPE 1 GR 500Interchangeable
interchangeable cross-reference
interchangeable
709-8500408 ITEM 41-2Interchangeable
interchangeable cross-reference
interchangeable
709-8500409 ITEM 1-11Interchangeable
interchangeable cross-reference
interchangeable
709-8500409Interchangeable
interchangeable cross-reference
interchangeable
0.734ODX0.406IDX0.063 CRES 316Interchangeable
interchangeable cross-reference
interchangeable
709-8500409 ITEM 1-16Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 0.4375 TYPE A NARROW?
0.4375 TYPE A NARROW is a 0.4375 TYPE A NARROW.
What parts can replace 0.4375 TYPE A NARROW?
There are 22 known substitutes for 0.4375 TYPE A NARROW: MIL-DTL-1222 TYPE 1 GR 500, 709-8500408 ITEM 41-2, 709-8500409 ITEM 1-11 and 19 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 0.4375 TYPE A NARROW?
0.4375 TYPE A NARROW is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-649-8085. 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: July 2026