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Technical Data Sheet
PartsTable / COMPONENT / 2-1179-188
2-1179-188 ✓ 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 COMP 302 OVERALL, thickness: 0.032 INCHES NOMINAL IN, hole_diameter: 0.500 INCHES MINIMUM AND 0.504 INCHES MAXIMUM IN, hardness_rating: 75.0 ROCKWELL B MINIMUM AND 85.0 ROCKWELL B MAXIMUM, overall_diameter: 0.651 INCHES MINIMUM AND 0.661 INCHES MAXIMUM IN, surface_treatment: PASSIVATE 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 5310-01-654-4871, 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
2-1179-188
NSN: 5310-01-654-4871
FSC: 5310
CAGE: 76854 — ELECTRO SWITCH CORP. DBA OAK GRISGSBY DIV ELECTROSWITCH (USA)
SPECIFICATIONS
materialSTEEL COMP 302 OVERALL
thickness0.032 INCHES NOMINAL IN
hole_diameter0.500 INCHES MINIMUM AND 0.504 INCHES MAXIMUM IN
hardness_rating75.0 ROCKWELL B MINIMUM AND 85.0 ROCKWELL B MAXIMUM
overall_diameter0.651 INCHES MINIMUM AND 0.661 INCHES MAXIMUM IN
surface_treatmentPASSIVATE OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identificationLCP MK 421 MODEL
cross-sectional_shape_styleRECTANGULAR
part_name_assigned_by_controlling_agencyWASHERS,FLAT FERROUS
surface_treatment_document_and_classificationNAVORD OD-7690 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-654-4871
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 2-1179-188 · 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: STEEL COMP 302 OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
HARDNESS RATING: 75.0 ROCKWELL B MINIMUM AND 85.0 ROCKWELL B MAXIMUM
•
OVERALL DIAMETER: 0.651 INCHES MINIMUM AND 0.661 INCHES MAXIMUM IN
•
CENTER HOLE SHAPE STYLE: ROUND
•
THICKNESS: 0.032 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.500 INCHES MINIMUM AND 0.504 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL COMP 302 OVERALL
PART NAME ASSIGNED BY CONTROLLING AGENCYWASHERS,FLAT FERROUS
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
HARDNESS RATING75.0 ROCKWELL B MINIMUM AND 85.0 ROCKWELL B MAXIMUM
OVERALL DIAMETER0.651 INCHES MINIMUM AND 0.661 INCHES MAXIMUM IN
CENTER HOLE SHAPE STYLEROUND
THICKNESS0.032 INCHES NOMINAL IN
HOLE DIAMETER0.500 INCHES MINIMUM AND 0.504 INCHES MAXIMUM IN
PERIPHERAL SHAPE STYLEROUND
END ITEM IDENTIFICATIONLCP MK 421 MODEL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
PA3506Interchangeable
interchangeable cross-reference
interchangeable
ASTM B221Interchangeable
interchangeable cross-reference
interchangeable
8006Interchangeable
interchangeable cross-reference
interchangeable
221179Interchangeable
interchangeable cross-reference
interchangeable
21179Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 2-1179-188?
2-1179-188 is a WASHER,FLAT.
What parts can replace 2-1179-188?
There are 5 known substitutes for 2-1179-188: PA3506, ASTM B221, 8006 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 2-1179-188?
2-1179-188 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-654-4871. 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