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PartsTable / COMPONENT / R20828
R20828 ✓ 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 NUT,PLAIN,SLOTTED,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1212 OVERALL, nut_style: SLOTTED, HEXAGON, nut_height: 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN, thread_class: 3B, thread_series: UNEF, thread_direction: RIGHT-HAND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-769-6464, 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
R20828
NSN: 5310-00-769-6464
FSC: 5310
CAGE: 83120 — PRESSED METALS OF AMERICA INC (USA)
SPECIFICATIONS
materialSTEEL COMP 1212 OVERALL
nut_styleSLOTTED, HEXAGON
nut_height0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNEF
thread_directionRIGHT-HAND
width_across_flats1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN
nominal_thread_size0.750 INCHES IN
bearing_surface_typeWASHER FACED
thread_quantity_per_inch20
material_document_and_classificationSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-769-6464
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: R20828 · 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
•
NUT HEIGHT: 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
•
BEARING SURFACE TYPE: WASHER FACED
•
NOMINAL THREAD SIZE: 0.750 INCHES IN
•
THREAD QUANTITY PER INCH: 20
•
THREAD SERIES: UNEF
•
THREAD DIRECTION: RIGHT-HAND
•
NUT STYLE: SLOTTED, HEXAGON
•
MATERIAL: STEEL COMP 1212 OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
NUT HEIGHT0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
BEARING SURFACE TYPEWASHER FACED
NOMINAL THREAD SIZE0.750 INCHES IN
THREAD QUANTITY PER INCH20
THREAD SERIESUNEF
THREAD DIRECTIONRIGHT-HAND
NUT STYLESLOTTED, HEXAGON
MATERIALSTEEL COMP 1212 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD CLASS3B
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
70504R2Interchangeable
interchangeable cross-reference
interchangeable
63450HXInterchangeable
interchangeable cross-reference
interchangeable
231609Interchangeable
interchangeable cross-reference
interchangeable
356125SInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is R20828?
R20828 is a NUT,PLAIN,SLOTTED,HEXAGON.
What parts can replace R20828?
There are 4 known substitutes for R20828: 70504R2, 63450HX, 231609 and 1 more. Substitute compatibility should be verified for your specific system.
Is R20828 still available?
R20828 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