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7791021 — NUT,PLAIN,KNURLED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

7791021: NUT,PLAIN,KNURLED.

The NUT,PLAIN,KNURLED is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1137 OR STEEL COMP 1141 OVERALL, nut_style: KNURLED, knurl_width: 0.197 INCHES NOMINAL IN, nut_diameter: 0.385 INCHES NOMINAL IN, thread_class: 2B, nut_thickness: 0.600 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-440-3355, 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
7791021
NSN: 5310-00-440-3355
FSC: 5310 — Nuts and Washers
CAGE: 19204 — ARMY, UNITED STATES DEPARTMENT OF THE DBA ROCK ISLAND ARSENAL JMTC (USA)
SPECIFICATIONS
materialSTEEL COMP 1137 OR STEEL COMP 1141 OVERALL
nut_styleKNURLED
knurl_width0.197 INCHES NOMINAL IN
nut_diameter0.385 INCHES NOMINAL IN
thread_class2B
nut_thickness0.600 INCHES NOMINAL IN
thread_seriesUNIFIED NATIONAL COARSE (UNC)
hardness_rating66.0 ROCKWELL A MINIMUM AND 69.0 ROCKWELL A MAXIMUM
thread_directionRIGHT-HAND
surface_treatmentPHOSPHATE MANGANESE OR PHOSPHATE ZINC OVERALL
nominal_thread_size0.086 INCHES IN
thread_quantity_per_inch56
NSN5310-00-440-3355
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 7791021 · 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: D0D-P-16232 TYPE M,CLASS 1 MIL SPEC 1ST TREATMENT RESPONSE OR D0D-P-16232 TYPE Z CLASS 1 MIL SPEC 2ND TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
HARDNESS RATING: 66.0 ROCKWELL A MINIMUM AND 69.0 ROCKWELL A MAXIMUM
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-624 FED SPEC ALL MATERIAL RESPONSES OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.086 INCHES IN
•
NUT DIAMETER: 0.385 INCHES NOMINAL IN
•
NUT THICKNESS: 0.600 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIOND0D-P-16232 TYPE M,CLASS 1 MIL SPEC 1ST TREATMENT RESPONSE OR D0D-P-16232 TYPE Z CLASS 1 MIL SPEC 2ND TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
HARDNESS RATING66.0 ROCKWELL A MINIMUM AND 69.0 ROCKWELL A MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-624 FED SPEC ALL MATERIAL RESPONSES OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.086 INCHES IN
NUT DIAMETER0.385 INCHES NOMINAL IN
NUT THICKNESS0.600 INCHES NOMINAL IN
SURFACE TREATMENTPHOSPHATE MANGANESE OR PHOSPHATE ZINC OVERALL
NUT STYLEKNURLED
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 3
5310PL1299612Reference document
Same NSN cross-reference
Reference document — Informative reference only
717124417607Reference document
Same NSN cross-reference
Reference document — Secondary reference
5310PL0916994Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandDemilitarization required — critical (Q)
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FREQUENTLY ASKED QUESTIONS
What is 7791021?
7791021 is a NUT,PLAIN,KNURLED.
What parts can replace 7791021?
There are 3 known substitutes for 7791021: 5310PL1299612, 717124417607, 5310PL0916994. Substitute compatibility should be verified for your specific system.
What is the NSN for 7791021?
7791021 is cataloged in the U.S. Government catalog under NSN 5310-00-440-3355. 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.