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9721990 — NUT,PLAIN,CLINCH

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

9721990: NUT,PLAIN,CLINCH.

The NUT,PLAIN,CLINCH is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: CLINCH, nut_height: 0.292 INCHES NOMINAL IN, nut_diameter: 0.438 INCHES NOMINAL IN, pilot_length: 0.120 INCHES NOMINAL IN, thread_class: 2B. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-865-5791, 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
9721990
NSN: 5310-00-865-5791
FSC: 5310 — Nuts and Washers
CAGE: 18876 — US ARMY AVIATION AND MISSILE COMMAND (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleCLINCH
nut_height0.292 INCHES NOMINAL IN
nut_diameter0.438 INCHES NOMINAL IN
pilot_length0.120 INCHES NOMINAL IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
pilot_diameter0.342 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND CHROMATE OVERALL
nominal_thread_size0.250 INCHES IN
thread_quantity_per_inch20
NSN5310-00-865-5791
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 9721990 · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM A165 ASSN STD ALL TREATMENT RESPONSES OVERALL
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
NUT DIAMETER: 0.438 INCHES NOMINAL IN
•
PILOT DIAMETER: 0.342 INCHES NOMINAL IN
•
PILOT LENGTH: 0.120 INCHES NOMINAL IN
•
NUT HEIGHT: 0.292 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM A165 ASSN STD ALL TREATMENT RESPONSES OVERALL
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.250 INCHES IN
NUT DIAMETER0.438 INCHES NOMINAL IN
PILOT DIAMETER0.342 INCHES NOMINAL IN
PILOT LENGTH0.120 INCHES NOMINAL IN
NUT HEIGHT0.292 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
NUT STYLECLINCH
SUBSTITUTES & CROSS-REFERENCES 3
414456-2504Reference document
Same NSN cross-reference
Reference document — Secondary reference
4189358Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
S0420-3Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 9721990?
9721990 is a NUT,PLAIN,CLINCH.
What parts can replace 9721990?
There are 3 known substitutes for 9721990: 414456-2504, 4189358, S0420-3. Substitute compatibility should be verified for your specific system.
What is the NSN for 9721990?
9721990 is cataloged in the U.S. Government catalog under NSN 5310-00-865-5791. 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.