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Technical Data Sheet
PartsTable / COMPONENT / 373-0191-010
373-0191-010 ✓ 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 WASHER,LOCK is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, hole_diameter: 0.377 INCHES MINIMUM AND 0.391 INCHES MAXIMUM IN, outside_diameter: 0.493 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN, style_designator: FLAT INTERNAL TEETH, precious_material: SILVER, surface_treatment: SILVER AND CHROMATE OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-201-0306, 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
373-0191-010
NSN: 5310-01-201-0306
FSC: 5310
CAGE: 13499 — ROCKWELL COLLINS, INC. DBA COLLINS AEROSPACE GOVERNMENT SYSTEMS DIV COLLINS AEROSPACE - GOVERNMENT SYSTEMS (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
hole_diameter0.377 INCHES MINIMUM AND 0.391 INCHES MAXIMUM IN
outside_diameter0.493 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN
style_designatorFLAT INTERNAL TEETH
precious_materialSILVER
surface_treatmentSILVER AND CHROMATE OVERALL
material_thickness0.022 INCHES NOMINAL IN
precious_material_and_locationEXTERNAL SURFACES SILVER
surface_treatment_document_and_classificationQQ-S-365,TYPE 1,2,OR 3,GRADE A FED SPEC ALL TREATMENT RESPONSES OVERALL
NSN5310-01-201-0306
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 373-0191-010 · 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
•
SURFACE TREATMENT: SILVER AND CHROMATE OVERALL
•
HOLE DIAMETER: 0.377 INCHES MINIMUM AND 0.391 INCHES MAXIMUM IN
•
PRECIOUS MATERIAL: SILVER
•
MATERIAL THICKNESS: 0.022 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 0.493 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN
•
PRECIOUS MATERIAL AND LOCATION: EXTERNAL SURFACES SILVER
•
MATERIAL: COPPER ALLOY OVERALL
•
STYLE DESIGNATOR: FLAT INTERNAL TEETH
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTSILVER AND CHROMATE OVERALL
HOLE DIAMETER0.377 INCHES MINIMUM AND 0.391 INCHES MAXIMUM IN
PRECIOUS MATERIALSILVER
MATERIAL THICKNESS0.022 INCHES NOMINAL IN
OUTSIDE DIAMETER0.493 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN
PRECIOUS MATERIAL AND LOCATIONEXTERNAL SURFACES SILVER
MATERIALCOPPER ALLOY OVERALL
STYLE DESIGNATORFLAT INTERNAL TEETH
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-S-365,TYPE 1,2,OR 3,GRADE A FED SPEC ALL TREATMENT RESPONSES OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
6577Interchangeable
interchangeable cross-reference
interchangeable
6577-1BInterchangeable
interchangeable cross-reference
interchangeable
MS51887-89Interchangeable
interchangeable cross-reference
interchangeable
142269Interchangeable
interchangeable cross-reference
interchangeable
WWP471BEQBULEInterchangeable
interchangeable cross-reference
interchangeable
267098Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 373-0191-010?
373-0191-010 is a WASHER,LOCK.
What parts can replace 373-0191-010?
There are 15 known substitutes for 373-0191-010: 6577, 6577-1B, MS51887-89 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 373-0191-010?
373-0191-010 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-201-0306. 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