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PartsTable / COMPONENT / 204B1057
204B1057 ✓ 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,FLAT is a the manufacturer industrial component. Key specifications include material: COPPER OVERALL, thickness: 0.031 INCHES NOMINAL IN, hole_diameter: 0.360 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN, hardness_rating: 56.0 ROCKWELL B MINIMUM AND 74.0 ROCKWELL B MAXIMUM, overall_diameter: 0.609 INCHES MINIMUM AND 0.641 INCHES MAXIMUM IN, peripheral_shape_style: ROUND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-524-0236, 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
204B1057
NSN: 5310-00-524-0236
FSC: 5310
CAGE: 1VPW8 — GENERAL DYNAMICS MISSION SYSTEMS, INC. DBA GDMS (USA)
SPECIFICATIONS
materialCOPPER OVERALL
thickness0.031 INCHES NOMINAL IN
hole_diameter0.360 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
hardness_rating56.0 ROCKWELL B MINIMUM AND 74.0 ROCKWELL B MAXIMUM
overall_diameter0.609 INCHES MINIMUM AND 0.641 INCHES MAXIMUM IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationQQ-B-613 FED SPEC ALL MATERIAL RESPONSES AND QQ-C-502 FED SPEC ALL MATERIAL RESPONSES OVERALL
NSN5310-00-524-0236
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 204B1057 · 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
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-613 FED SPEC ALL MATERIAL RESPONSES AND QQ-C-502 FED SPEC ALL MATERIAL RESPONSES OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
OVERALL DIAMETER: 0.609 INCHES MINIMUM AND 0.641 INCHES MAXIMUM IN
•
PERIPHERAL SHAPE STYLE: ROUND
•
THICKNESS: 0.031 INCHES NOMINAL IN
•
HARDNESS RATING: 56.0 ROCKWELL B MINIMUM AND 74.0 ROCKWELL B MAXIMUM
•
MATERIAL: COPPER OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-613 FED SPEC ALL MATERIAL RESPONSES AND QQ-C-502 FED SPEC ALL MATERIAL RESPONSES OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
OVERALL DIAMETER0.609 INCHES MINIMUM AND 0.641 INCHES MAXIMUM IN
PERIPHERAL SHAPE STYLEROUND
THICKNESS0.031 INCHES NOMINAL IN
HARDNESS RATING56.0 ROCKWELL B MINIMUM AND 74.0 ROCKWELL B MAXIMUM
MATERIALCOPPER OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.360 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
610697Interchangeable
interchangeable cross-reference
interchangeable
900553Interchangeable
interchangeable cross-reference
interchangeable
25T819D7Interchangeable
interchangeable cross-reference
interchangeable
AN520-6-7Interchangeable
interchangeable cross-reference
interchangeable
10468Interchangeable
interchangeable cross-reference
interchangeable
FFS92ANDTYPE1ANDSTYLE1SInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 204B1057?
204B1057 is a WASHER,FLAT.
What parts can replace 204B1057?
There are 13 known substitutes for 204B1057: 610697, 900553, 25T819D7 and 10 more. Substitute compatibility should be verified for your specific system.
Is 204B1057 still available?
204B1057 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026