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PartsTable / COMPONENT / 51826R1
51826R1 ✓ 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: 0.656 INCHES MINIMUM AND 0.672 INCHES MAXIMUM IN, overall_diameter: 1.109 INCHES MINIMUM AND 1.141 INCHES MAXIMUM IN, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-737-6684, 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
51826R1
NSN: 5310-00-737-6684
FSC: 5310
CAGE: 31007 — NAVISTAR INTERNATIONAL CORPORATION DBA NAVISTAR (USA)
SPECIFICATIONS
materialCOPPER OVERALL
thickness0.031 INCHES NOMINAL IN
hole_diameter0.656 INCHES MINIMUM AND 0.672 INCHES MAXIMUM IN
overall_diameter1.109 INCHES MINIMUM AND 1.141 INCHES MAXIMUM IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationQQ-C-502 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-737-6684
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 51826R1 · 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
•
OVERALL DIAMETER: 1.109 INCHES MINIMUM AND 1.141 INCHES MAXIMUM IN
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-C-502 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: COPPER OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
HOLE DIAMETER: 0.656 INCHES MINIMUM AND 0.672 INCHES MAXIMUM IN
•
THICKNESS: 0.031 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL DIAMETER1.109 INCHES MINIMUM AND 1.141 INCHES MAXIMUM IN
PERIPHERAL SHAPE STYLEROUND
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-C-502 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIALCOPPER OVERALL
CENTER HOLE SHAPE STYLEROUND
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
HOLE DIAMETER0.656 INCHES MINIMUM AND 0.672 INCHES MAXIMUM IN
THICKNESS0.031 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
307B173Interchangeable
interchangeable cross-reference
interchangeable
3R83-884Interchangeable
interchangeable cross-reference
interchangeable
122015Interchangeable
interchangeable cross-reference
interchangeable
371115Interchangeable
interchangeable cross-reference
interchangeable
32288-015Interchangeable
interchangeable cross-reference
interchangeable
1232E20Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 51826R1?
51826R1 is a WASHER,FLAT.
What parts can replace 51826R1?
There are 11 known substitutes for 51826R1: 307B173, 3R83-884, 122015 and 8 more. Substitute compatibility should be verified for your specific system.
Is 51826R1 still available?
51826R1 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