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PartsTable / COMPONENT / H50437-4
H50437-4 ✓ 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,EXTENDED WASHER. Key specifications include material: STEEL COMP 8740 OR STEEL COMP 4037 OVERALL, nut_style: HEXAGON, lubrication: DRY FILM LUBRICANT, temp_rating: 232.0 CELSIUS MAXIMUM DEGC, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF). This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-194-0675, 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
H50437-4
NSN: 5310-01-194-0675
FSC: 5310
CAGE: 15653 — HOWMET GLOBAL FASTENING SYSTEMS INC (USA)
SPECIFICATIONS
materialSTEEL COMP 8740 OR STEEL COMP 4037 OVERALL
nut_styleHEXAGON
lubricationDRY FILM LUBRICANT
temp_rating232.0 CELSIUS MAXIMUM DEGC
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
overall_height0.365 INCHES MAXIMUM IN
hardness_rating39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
surface_treatmentTIN OVERALL
width_across_flats0.305 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
NSN5310-01-194-0675
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: H50437-4 · 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
•
HARDNESS RATING: 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
•
THREAD CLASS: 3B
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
MATERIAL: STEEL COMP 8740 OR STEEL COMP 4037 OVERALL
•
WIDTH ACROSS FLATS: 0.305 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
SURFACE TREATMENT: TIN OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
HARDNESS RATING39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
THREAD CLASS3B
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
MATERIALSTEEL COMP 8740 OR STEEL COMP 4037 OVERALL
WIDTH ACROSS FLATS0.305 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
OVERALL HEIGHT0.365 INCHES MAXIMUM IN
NOMINAL THREAD SIZE0.250 INCHES IN
SURFACE TREATMENTTIN OVERALL
COUNTERBORE DIAMETER0.291 INCHES MINIMUM AND 0.295 INCHES MAXIMUM NUT IN
NUT COUNTERBORE DEPTH0.175 INCHES MINIMUM AND 0.185 INCHES MAXIMUM NUT IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
N-114Interchangeable
interchangeable cross-reference
interchangeable
215-33504-1Interchangeable
interchangeable cross-reference
interchangeable
3275497Interchangeable
interchangeable cross-reference
interchangeable
M1069Interchangeable
interchangeable cross-reference
interchangeable
242T1143Interchangeable
interchangeable cross-reference
interchangeable
78456-820Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is H50437-4?
H50437-4 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace H50437-4?
There are 7 known substitutes for H50437-4: N-114, 215-33504-1, 3275497 and 4 more. Substitute compatibility should be verified for your specific system.
Is H50437-4 still available?
H50437-4 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