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H39546-3 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

H39546-3: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: STEEL COMP 8740 OVERALL, nut_style: DOUBLE HEXAGON, thread_class: 3BG, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), overall_height: 0.250 INCHES MAXIMUM IN, hardness_rating: 36.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-431-0628, 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
H39546-3
NSN: 5310-00-431-0628
FSC: 5310 — Nuts and Washers
CAGE: 15653 — HOWMET GLOBAL FASTENING SYSTEMS INC (USA)
SPECIFICATIONS
materialSTEEL COMP 8740 OVERALL
nut_styleDOUBLE HEXAGON
thread_class3BG
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
overall_height0.250 INCHES MAXIMUM IN
hardness_rating36.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
washer_thickness0.030 INCHES MINIMUM IN
countersink_angle85.0 DEGREES MINIMUM AND 95.0 DEGREES MAXIMUM NUT
surface_treatmentCADMIUM OVERALL
width_across_flats0.243 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN
NSN5310-00-431-0628
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: H39546-3 · 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
•
WASHER OUTSIDE DIAMETER: 0.350 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.243 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: AMS 2400 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
HARDNESS RATING: 36.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
•
WASHER THICKNESS: 0.030 INCHES MINIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.250 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER0.350 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.243 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS 2400 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
HARDNESS RATING36.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
WASHER THICKNESS0.030 INCHES MINIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.190 INCHES IN
SUBSTITUTES & CROSS-REFERENCES 1
3016637Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is H39546-3?
H39546-3 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace H39546-3?
There is 1 known substitute for H39546-3: 3016637. Substitute compatibility should be verified for your specific system.
What is the NSN for H39546-3?
H39546-3 is cataloged in the U.S. Government catalog under NSN 5310-00-431-0628. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.