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641-4340-001 — NUT,PLAIN,SQUARE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

641-4340-001: NUT,PLAIN,SQUARE.

The NUT,PLAIN,SQUARE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OVERALL, nut_style: SQUARESQUARE, nut_height: 0.163 INCHES NOMINAL0.163 INCHES NOMINAL IN, thread_class: 2B2B, thread_series: UNIFIED NATIONAL COARSE (UNC)UNIFIED NATIONAL COARSE (UNC), special_features: WASHER FACE 0.244 IN. DIAMETER AND 0.038 IN.

THICKNESSWASHER FACE 0.244 IN. DIAMETER AND 0.038 IN. THICKNESS IN.

This part is cataloged in the U.S. Government catalog under NSN 5310-01-133-4861, 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
641-4340-001
NSN: 5310-01-133-4861
FSC: 5310 — Nuts and Washers
CAGE: 13499 — ROCKWELL COLLINS, INC. DBA COLLINS AEROSPACE GOVERNMENT SYSTEMS DIV COLLINS AEROSPACE - GOVERNMENT SYSTEMS (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
nut_styleSQUARESQUARE
nut_height0.163 INCHES NOMINAL0.163 INCHES NOMINAL IN
thread_class2B2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)UNIFIED NATIONAL COARSE (UNC)
special_featuresWASHER FACE 0.244 IN. DIAMETER AND 0.038 IN. THICKNESSWASHER FACE 0.244 IN. DIAMETER AND 0.038 IN. THICKNESS IN
thread_directionRIGHT-HANDRIGHT-HAND
countersink_angle90.0 DEGREES NOMINAL FIRST END90.0 DEGREES NOMINAL FIRST END
surface_treatmentPASSIVATE OVERALLPASSIVATE OVERALL
width_across_flats0.312 INCHES NOMINAL0.312 INCHES NOMINAL IN
nominal_thread_size0.138 INCHES0.138 INCHES IN
bearing_surface_typeWASHER FACEDWASHER FACED
NSN5310-01-133-4861
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 641-4340-001 · 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
•
WIDTH ACROSS FLATS: 0.312 INCHES NOMINAL0.312 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALLQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)UNIFIED NATIONAL COARSE (UNC)
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A 582,COND A ASSN STD SINGLE MATERIAL RESPONSE OVERALLASTM A 582,COND A ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HANDRIGHT-HAND
•
NOMINAL THREAD SIZE: 0.138 INCHES0.138 INCHES IN
•
NUT HEIGHT: 0.163 INCHES NOMINAL0.163 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.312 INCHES NOMINAL0.312 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALLQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)UNIFIED NATIONAL COARSE (UNC)
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A 582,COND A ASSN STD SINGLE MATERIAL RESPONSE OVERALLASTM A 582,COND A ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HANDRIGHT-HAND
NOMINAL THREAD SIZE0.138 INCHES0.138 INCHES IN
NUT HEIGHT0.163 INCHES NOMINAL0.163 INCHES NOMINAL IN
SPECIAL FEATURESWASHER FACE 0.244 IN. DIAMETER AND 0.038 IN. THICKNESSWASHER FACE 0.244 IN. DIAMETER AND 0.038 IN. THICKNESS IN
SURFACE TREATMENTPASSIVATE OVERALLPASSIVATE OVERALL
COUNTERSINK ANGLE90.0 DEGREES NOMINAL FIRST END90.0 DEGREES NOMINAL FIRST END
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 641-4340-001?
641-4340-001 is a NUT,PLAIN,SQUARE.
What is the NSN for 641-4340-001?
641-4340-001 is cataloged in the U.S. Government catalog under NSN 5310-01-133-4861. 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.