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PartsTable / COMPONENT / 250799R1
250799R1 ✓ 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,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1115 OR STEEL COMP 1110 OVERALL, nut_style: HEXAGON, nut_height: 0.188 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNF, thread_direction: LEFT-HAND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-268-7082, 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
250799R1
NSN: 5310-00-268-7082
FSC: 5310
CAGE: 92679 — NAVISTAR INTL CORP MELROSE PARK ENGINE PLANT LOCATION /MELROSE PARK/ (USA)
SPECIFICATIONS
materialSTEEL COMP 1115 OR STEEL COMP 1110 OVERALL
nut_styleHEXAGON
nut_height0.188 INCHES NOMINAL IN
thread_class2B
thread_seriesUNF
thread_directionLEFT-HAND
width_across_flats0.500 INCHES NOMINAL IN
nominal_thread_size0.312 INCHES IN
bearing_surface_typeWASHER FACED
thread_quantity_per_inch24
material_document_and_classification66 FED STD ALL MATERIAL RESPONSES OVERALL
NSN5310-00-268-7082
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 250799R1 · 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 STYLE: HEXAGON
•
NUT HEIGHT: 0.188 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.312 INCHES IN
•
THREAD QUANTITY PER INCH: 24
•
THREAD SERIES: UNF
•
BEARING SURFACE TYPE: WASHER FACED
•
THREAD DIRECTION: LEFT-HAND
•
MATERIAL: STEEL COMP 1115 OR STEEL COMP 1110 OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
NUT STYLEHEXAGON
NUT HEIGHT0.188 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.312 INCHES IN
THREAD QUANTITY PER INCH24
THREAD SERIESUNF
BEARING SURFACE TYPEWASHER FACED
THREAD DIRECTIONLEFT-HAND
MATERIALSTEEL COMP 1115 OR STEEL COMP 1110 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
WIDTH ACROSS FLATS0.500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
RR-K-260Interchangeable
interchangeable cross-reference
interchangeable
A-A-1751 SZ1Interchangeable
interchangeable cross-reference
interchangeable
6142Interchangeable
interchangeable cross-reference
interchangeable
Y-18658-AInterchangeable
interchangeable cross-reference
interchangeable
6VR42-31-5Interchangeable
interchangeable cross-reference
interchangeable
6-8351Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 250799R1?
250799R1 is a NUT,PLAIN,HEXAGON.
What parts can replace 250799R1?
There are 8 known substitutes for 250799R1: RR-K-260, A-A-1751 SZ1, 6142 and 5 more. Substitute compatibility should be verified for your specific system.
Is 250799R1 still available?
250799R1 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