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BH00597-4 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

BH00597-4: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: STEEL CORROSION RESISTING WASHER, nut_style: HEXAGON, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), overall_height: 0.303 INCHES MAXIMUM IN, locking_feature: PREVAILING TORQUE ALL METAL DESIGN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-685-7408, 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
BH00597-4
NSN: 5310-01-685-7408
FSC: 5310 — Nuts and Washers
CAGE: 27238 — BRISTOL INDUSTRIES, LLC (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING WASHER
nut_styleHEXAGON
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
overall_height0.303 INCHES MAXIMUM IN
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
washer_thickness0.110 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN
surface_treatmentCADMIUM WASHER
width_across_flats0.305 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
nominal_thread_size0.2500 INCHES IN
end_item_identificationA10
NSN5310-01-685-7408
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: BH00597-4 · 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
•
WASHER OUTSIDE DIAMETER: 0.465 INCHES MINIMUM AND 0.475 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.305 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416, TYPE II, CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE NUT
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
WASHER THICKNESS: 0.110 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE WASHER
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.303 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER0.465 INCHES MINIMUM AND 0.475 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.305 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416, TYPE II, CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE NUT
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416, TYPE II, CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE WASHER
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
WASHER THICKNESS0.110 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5643 ASSN STD SINGLE MATERIAL RESPONSE WASHER
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5647 ASSN STD SINGLE MATERIAL RESPONSE AND AMS 5697 ASSN STD SINGLE MATERIAL RESPONSE NUT
THREAD DIRECTIONRIGHT-HAND
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 BH00597-4?
BH00597-4 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What is the NSN for BH00597-4?
BH00597-4 is cataloged in the U.S. Government catalog under NSN 5310-01-685-7408. This indicates validated use in U.S. government and defense supply chains.
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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.