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Technical Data Sheet
PartsTable / COMPONENT / 904187
904187 ✓ 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 inclosure_type: HERMETICALLY SEALED, overall_length: 2.500 INCHES NOMINAL IN, style_designator: ROUND TERMINAL/TERMINALS ON OPPOSITE SURFACES, features_provided: TIME DELAY AND MOISTURE RESISTANT AND ELECTROSTATIC SENSITIVE, nominal_thread_size: 0.112 INCHES IN, mounting_facility_type_and_quantity: 4 THREADED HOLE(S) LOCATION NOT OTHERWISE SPECIFIED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-336-6379, 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
904187
NSN: 5310-01-336-6379
FSC: 5310
CAGE: A274N — SCANDINAVIAN MANUFACTURING SCAMA AB (SWE)
SPECIFICATIONS
inclosure_typeHERMETICALLY SEALED
overall_length2.500 INCHES NOMINAL IN
style_designatorROUND TERMINAL/TERMINALS ON OPPOSITE SURFACES
features_providedTIME DELAY AND MOISTURE RESISTANT AND ELECTROSTATIC SENSITIVE
nominal_thread_size0.112 INCHES IN
mounting_facility_type_and_quantity4 THREADED HOLE(S) LOCATION NOT OTHERWISE SPECIFIED
mounting_facility_screw_thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
distance_between_centerlines_of_mounting_facilities_parallel_to_body_width0.420 INCHES NOMINAL IN
distance_between_centerlines_of_mounting_facilities_parallel_to_body_length1.820 INCHES NOMINAL IN
NSN5310-01-336-6379
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 904187 · 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: 0.636 INCHES MINIMUM AND 0.653 INCHES MAXIMUM IN
•
HARDNESS RATING: 45.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM
•
MATERIAL THICKNESS: 0.156 INCHES MINIMUM AND 0.166 INCHES MAXIMUM IN
•
DEPARTURE FROM CITED DOCUMENT: AS MODIFIED BY ZINC
•
STYLE DESIGNATOR: SPLIT HELICAL-RIGHT HAND
•
OUTSIDE DIAMETER: 1.079 INCHES MAXIMUM IN
•
MATERIAL: STEEL OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
HOLE DIAMETER0.636 INCHES MINIMUM AND 0.653 INCHES MAXIMUM IN
HARDNESS RATING45.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM
MATERIAL THICKNESS0.156 INCHES MINIMUM AND 0.166 INCHES MAXIMUM IN
DEPARTURE FROM CITED DOCUMENTAS MODIFIED BY ZINC
STYLE DESIGNATORSPLIT HELICAL-RIGHT HAND
OUTSIDE DIAMETER1.079 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENTZINC OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
5310000045034Interchangeable
interchangeable cross-reference
interchangeable
FFW84Interchangeable
interchangeable cross-reference
interchangeable
004-003005-059Interchangeable
interchangeable cross-reference
interchangeable
5310002328194Interchangeable
interchangeable cross-reference
interchangeable
MS35338-50Interchangeable
interchangeable cross-reference
interchangeable
103325Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 904187?
904187 is a WASHER,LOCK.
What parts can replace 904187?
There are 8 known substitutes for 904187: 5310000045034, FFW84, 004-003005-059 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 904187?
904187 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-336-6379. 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