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PartsTable / COMPONENT / 5999F
5999F ✓ 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

NUT,SELF-LOCKING,CONE SEAT,HEXAG. Key specifications include material: STEEL COMP 1212 OVERALL, nut_style: CONE SEAT, HEXAGON, nut_height: 0.594 INCHES NOMINAL IN, thread_class: 2B, thread_series: UN, cone_seat_angle: 60.00 DEGREES NOMINAL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-591-3172, 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
5999F
NSN: 5310-00-591-3172
FSC: 5310
CAGE: 45152 — OSHKOSH CORP (USA)
SPECIFICATIONS
materialSTEEL COMP 1212 OVERALL
nut_styleCONE SEAT, HEXAGON
nut_height0.594 INCHES NOMINAL IN
thread_class2B
thread_seriesUN
cone_seat_angle60.00 DEGREES NOMINAL
locking_featureFREE-RUNNING ALL METAL DESIGN
thread_directionLEFT-HAND
width_across_flats2.500 INCHES NOMINAL IN
nominal_thread_size1.875 INCHES IN
thread_quantity_per_inch16
material_document_and_classificationSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-591-3172
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 5999F · 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
•
THREAD DIRECTION: LEFT-HAND
•
CONE SEAT ANGLE: 60.00 DEGREES NOMINAL
•
THREAD SERIES: UN
•
THREAD QUANTITY PER INCH: 16
•
NOMINAL THREAD SIZE: 1.875 INCHES IN
•
NUT HEIGHT: 0.594 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: STEEL COMP 1212 OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONLEFT-HAND
CONE SEAT ANGLE60.00 DEGREES NOMINAL
THREAD SERIESUN
THREAD QUANTITY PER INCH16
NOMINAL THREAD SIZE1.875 INCHES IN
NUT HEIGHT0.594 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIALSTEEL COMP 1212 OVERALL
LOCKING FEATUREFREE-RUNNING ALL METAL DESIGN
NUT STYLECONE SEAT, HEXAGON
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
5823Interchangeable
interchangeable cross-reference
interchangeable
8344Interchangeable
interchangeable cross-reference
interchangeable
PRP902-53-718-40Interchangeable
interchangeable cross-reference
interchangeable
MIL-E-1/217Interchangeable
interchangeable cross-reference
interchangeable
11-340Interchangeable
interchangeable cross-reference
interchangeable
G10780Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5999F?
5999F is a NUT,SELF-LOCKING,CONE SEAT,HEXAG.
What parts can replace 5999F?
There are 15 known substitutes for 5999F: 5823, 8344, PRP902-53-718-40 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 5999F?
5999F is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-591-3172. 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