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4001221 — NUT,PLAIN,ROUND

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

4001221: NUT,PLAIN,ROUND.

The NUT,PLAIN,ROUND is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 OVERALL, nut_style: ROUND, nut_diameter: 0.923 INCHES MINIMUM AND 0.943 INCHES MAXIMUM IN, nut_thickness: 0.209 INCHES MINIMUM AND 0.229 INCHES MAXIMUM IN, thread_series: UNS, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-382-7589, 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
4001221
NSN: 5310-00-382-7589
FSC: 5310 — Nuts and Washers
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
nut_styleROUND
nut_diameter0.923 INCHES MINIMUM AND 0.943 INCHES MAXIMUM IN
nut_thickness0.209 INCHES MINIMUM AND 0.229 INCHES MAXIMUM IN
thread_seriesUNS
thread_directionRIGHT-HAND
countersink_angle85.0 DEGREES MINIMUM AND 95.0 DEGREES MAXIMUM NUT
drive_point_depth0.101 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
drive_point_width0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
small_end_diameter0.730 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
nominal_thread_size0.586 INCHES IN
drive_point_quantity8
NSN5310-00-382-7589
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4001221 · 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
•
THREAD SERIES: UNS
•
THREAD PITCH DIAMETERS: +0.5657 TO 0.5692 INCHES IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
DRIVE POINT WIDTH: 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.586 INCHES IN
•
NUT DIAMETER: 0.923 INCHES MINIMUM AND 0.943 INCHES MAXIMUM IN
•
DRIVE POINT DEPTH: 0.101 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
THREAD SERIESUNS
THREAD PITCH DIAMETERS+0.5657 TO 0.5692 INCHES IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
DRIVE POINT WIDTH0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.586 INCHES IN
NUT DIAMETER0.923 INCHES MINIMUM AND 0.943 INCHES MAXIMUM IN
DRIVE POINT DEPTH0.101 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
NUT THICKNESS0.209 INCHES MINIMUM AND 0.229 INCHES MAXIMUM IN
SMALL END DIAMETER0.730 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
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 1
5310PL0723174Reference document
Same NSN cross-reference
Reference document — Informative reference only
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 4001221?
4001221 is a NUT,PLAIN,ROUND.
What parts can replace 4001221?
There is 1 known substitute for 4001221: 5310PL0723174. Substitute compatibility should be verified for your specific system.
What is the NSN for 4001221?
4001221 is cataloged in the U.S. Government catalog under NSN 5310-00-382-7589. 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.