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90391 ✓ 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 ADAPTER,FLUID FILTER is a the manufacturer industrial component. Key specifications include part_name_assigned_by_controlling_agency: FITTING, FILTER. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-155-4958, 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
90391
NSN: 5310-00-155-4958
FSC: 5310
CAGE: 06KW9 — LUCENT TECHNOLOGIES INC DBA FEDERAL MARKETING GROUP (USA)
SPECIFICATIONS
part_name_assigned_by_controlling_agencyFITTING, FILTER
NSN5310-00-155-4958
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 90391 · 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
•
HOLE DIAMETER: 0.359 INCHES NOMINAL IN
•
CENTER HOLE SHAPE STYLE: DEE
•
MATERIAL: WOOL OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
PERIPHERAL SHAPE STYLE: ROUND
•
CENTER HOLE WIDTH: 0.281 INCHES NOMINAL IN
•
OVERALL DIAMETER: 0.625 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
HOLE DIAMETER0.359 INCHES NOMINAL IN
CENTER HOLE SHAPE STYLEDEE
MATERIALWOOL OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
SPECIAL FEATURESCOLOR WHITE
PERIPHERAL SHAPE STYLEROUND
CENTER HOLE WIDTH0.281 INCHES NOMINAL IN
OVERALL DIAMETER0.625 INCHES NOMINAL IN
THICKNESS0.250 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
9039-1Interchangeable
interchangeable cross-reference
interchangeable
28028Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 90391?
90391 is a ADAPTER,FLUID FILTER.
What parts can replace 90391?
There are 2 known substitutes for 90391: 9039-1, 28028. Substitute compatibility should be verified for your specific system.
What is the NSN for 90391?
90391 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-155-4958. 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