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7521461 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

7521461: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: STEEL COMP 8740 OVERALL, nut_style: HEXAGON, thread_class: 3B, thread_series: UNF, overall_height: 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN, hardness_rating: 32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-752-1461, 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
7521461
NSN: 5310-00-752-1461
FSC: 5310 — Nuts and Washers
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
materialSTEEL COMP 8740 OVERALL
nut_styleHEXAGON
thread_class3B
thread_seriesUNF
overall_height0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
hardness_rating32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM
locking_featureFREE-RUNNING ALL METAL DESIGN OR PREVAILING TORQUE ALL METAL DESIGN
special_features30 DEGREE CHAMFER ON EXTENDED WASHER
thread_directionRIGHT-HAND
washer_thickness0.095 INCHES MINIMUM AND 0.115 INCHES MAXIMUM IN
features_providedCASEHARDENED
width_across_flats0.610 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
NSN5310-00-752-1461
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 7521461 · 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
•
WASHER OUTSIDE DIAMETER: 0.928 INCHES MINIMUM AND 0.948 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.610 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
•
THREAD SERIES: UNF
•
HARDNESS RATING: 32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM
•
WASHER THICKNESS: 0.095 INCHES MINIMUM AND 0.115 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD SINGLE MATERIAL RESPONSE OR QQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
FEATURES PROVIDED: CASEHARDENED
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER0.928 INCHES MINIMUM AND 0.948 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.610 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
THREAD SERIESUNF
HARDNESS RATING32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM
WASHER THICKNESS0.095 INCHES MINIMUM AND 0.115 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE OR QQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
FEATURES PROVIDEDCASEHARDENED
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.438 INCHES 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 3
62.21.019Reference document
Same NSN cross-reference
Reference document — Secondary reference
6763773Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
5310007521461Reference 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 7521461?
7521461 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace 7521461?
There are 3 known substitutes for 7521461: 62.21.019, 6763773, 5310007521461. Substitute compatibility should be verified for your specific system.
What is the NSN for 7521461?
7521461 is cataloged in the U.S. Government catalog under NSN 5310-00-752-1461. 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.