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37665 ✓ 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

NUT ASSEMBLY,SELF-LOCKING,GANG C. Key specifications include physical_form: CREAM, water_soluble_feature: NOT PROVIDED, quantity_within_each_unit_package: 3.0 OUNCES OZ, protection_type_for_which_designed: PETROLEUM SOLVENTS. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-090-4731, 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
37665
NSN: 5310-00-090-4731
FSC: 5310
CAGE: 55176 — VSE AVIATION, INC. (USA)
SPECIFICATIONS
physical_formCREAM
water_soluble_featureNOT PROVIDED
quantity_within_each_unit_package3.0 OUNCES OZ
protection_type_for_which_designedPETROLEUM SOLVENTS
NSN5310-00-090-4731
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 37665 · 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
KEY FEATURES
•
LOCKING FEATURE: PREVAILING TORQUE WITH NONMETALLIC INSERT
•
CHANNEL STYLE: STRAIGHT TYPE
•
THREAD SERIES: UNF
•
THREAD CLASS: 2B
•
NUT QUANTITY: 2
•
THREAD QUANTITY PER INCH: 32
•
NOMINAL THREAD SIZE: 0.190 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
LOCKING FEATUREPREVAILING TORQUE WITH NONMETALLIC INSERT
OVERALL WIDTH0.640 INCHES NOMINAL IN
CHANNEL STYLESTRAIGHT TYPE
THREAD SERIESUNF
THREAD CLASS2B
NUT QUANTITY2
THREAD QUANTITY PER INCH32
NOMINAL THREAD SIZE0.190 INCHES IN
MATERIALSTEEL NUT
NUT SPACING0.820 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
H8025Interchangeable
interchangeable cross-reference
interchangeable
471771Interchangeable
interchangeable cross-reference
interchangeable
37665Interchangeable
interchangeable cross-reference
interchangeable
P-S-411Interchangeable
interchangeable cross-reference
interchangeable
FC-37665Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 37665?
37665 is a NUT ASSEMBLY,SELF-LOCKING,GANG C.
What parts can replace 37665?
There are 5 known substitutes for 37665: H8025, 471771, 37665 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 37665?
37665 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-090-4731. 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