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Technical Data Sheet
PartsTable / COMPONENT / 2557733
2557733 ✓ 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: STEEL OVERALL, nut_style: HEXAGON, thickness: 0.062 INCHES NOMINAL IN, nut_height: 0.427 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN, thread_class: 3B, hole_diameter: 0.502 INCHES MINIMUM AND 0.512 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-167-0821, 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
2557733
NSN: 5310-00-167-0821
FSC: 5310
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
thickness0.062 INCHES NOMINAL IN
nut_height0.427 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
thread_class3B
hole_diameter0.502 INCHES MINIMUM AND 0.512 INCHES MAXIMUM IN
thread_seriesUNIFIED NATIONAL COARSE (UNC)
outside_diameter0.869 INCHES MAXIMUM IN
overall_diameter2.000 INCHES NOMINAL IN
style_designatorSPLIT HELICAL-RIGHT HAND
thread_directionRIGHT-HAND
material_thickness0.125 INCHES NOMINAL IN
NSN5310-00-167-0821
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 2557733 · 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
•
THICKNESS: 0.053 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
•
HOLE DIAMETER: 0.380 INCHES MINIMUM AND 0.400 INCHES MAXIMUM IN
•
MATERIAL: STEEL OVERALL
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-7952 MIL SPEC SINGLE MATERIAL RESPONSE OR QQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
THICKNESS0.053 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
HOLE DIAMETER0.380 INCHES MINIMUM AND 0.400 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
END ITEM IDENTIFICATIONA4 BRADLEY FIGHTING VEHICLE; A3 BRADLEY FIGHTING VEHICLE; MULTIPLE LAUNCH ROCKET SYSTEM
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-7952 MIL SPEC SINGLE MATERIAL RESPONSE OR QQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
CENTER HOLE SHAPE STYLEROUND
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
OVERALL DIAMETER0.620 INCHES MINIMUM AND 0.645 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 32
07201007Interchangeable
interchangeable cross-reference
interchangeable
124A9372AA003Interchangeable
interchangeable cross-reference
interchangeable
120391Interchangeable
interchangeable cross-reference
interchangeable
126177Interchangeable
interchangeable cross-reference
interchangeable
P103Interchangeable
interchangeable cross-reference
interchangeable
347462Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 2557733?
2557733 is a WASHER,FLAT.
What parts can replace 2557733?
There are 32 known substitutes for 2557733: 07201007, 124A9372AA003, 120391 and 29 more. Substitute compatibility should be verified for your specific system.
Is 2557733 still available?
2557733 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