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74B580172-101 — NUT,SELF-LOCKING,ROUND

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

74B580172-101: NUT,SELF-LOCKING,ROUND.

The NUT,SELF-LOCKING,ROUND is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 2024 OVERALL EXCEPT INSERT, nut_style: ROUND, nut_diameter: 2.255 INCHES MINIMUM AND 2.265 INCHES MAXIMUM IN, thread_class: 3B, nut_thickness: 0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN, thread_series: UNIFIED NATIONAL JOINT (UNJ). This part is cataloged in the U.S.

Government catalog under NSN 5310-01-131-2947, 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
74B580172-101
NSN: 5310-01-131-2947
FSC: 5310 — Nuts and Washers
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2024 OVERALL EXCEPT INSERT
nut_styleROUND
nut_diameter2.255 INCHES MINIMUM AND 2.265 INCHES MAXIMUM IN
thread_class3B
nut_thickness0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN
thread_seriesUNIFIED NATIONAL JOINT (UNJ)
locking_featurePREVAILING TORQUE WITH NONMETALLIC INSERT
special_featuresEXTENDED WASHER ON BEARING SURFACE 0.090 IN. THICK AND 2.800 IN. DIAMETER IN
thread_directionRIGHT-HAND
drive_point_depth2.280 INCHES NOMINAL IN
drive_point_width0.350 INCHES NOMINAL IN
surface_treatmentANODIZE OVERALL EXCEPT INSERT
NSN5310-01-131-2947
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 74B580172-101 · 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
•
BEARING SURFACE FINISH: 63.0 MICROINCHES
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-A-8625,TYPE 2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL EXCEPT INSERT
•
THREAD SERIES: UNIFIED NATIONAL JOINT (UNJ)
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-225/6,T851 FED SPEC SINGLE MATERIAL RESPONSE OVERALL EXCEPT INSERT
•
NUT COUNTERBORE DEPTH: 0.095 INCHES MINIMUM AND 0.105 INCHES MAXIMUM WASHER IN
•
DRIVE POINT WIDTH: 0.350 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 2.000 INCHES IN
TECHNICAL CHARACTERISTICS
BEARING SURFACE FINISH63.0 MICROINCHES
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625,TYPE 2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL EXCEPT INSERT
THREAD SERIESUNIFIED NATIONAL JOINT (UNJ)
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225/6,T851 FED SPEC SINGLE MATERIAL RESPONSE OVERALL EXCEPT INSERT
NUT COUNTERBORE DEPTH0.095 INCHES MINIMUM AND 0.105 INCHES MAXIMUM WASHER IN
DRIVE POINT WIDTH0.350 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE2.000 INCHES IN
NUT DIAMETER2.255 INCHES MINIMUM AND 2.265 INCHES MAXIMUM IN
COUNTERBORE DIAMETER2.075 INCHES MINIMUM AND 2.085 INCHES MAXIMUM WASHER 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
LS580172-101Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 74B580172-101?
74B580172-101 is a NUT,SELF-LOCKING,ROUND.
What parts can replace 74B580172-101?
There is 1 known substitute for 74B580172-101: LS580172-101. Substitute compatibility should be verified for your specific system.
What is the NSN for 74B580172-101?
74B580172-101 is cataloged in the U.S. Government catalog under NSN 5310-01-131-2947. 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.