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525-540-9101 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

525-540-9101: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: STEEL COMP 1137 OVERALL, nut_style: HEXAGON, thread_class: 3B, thread_series: UNF, overall_height: 0.377 INCHES MAXIMUM IN, locking_feature: FREE-RUNNING ALL METAL DESIGN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-409-1753, 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
525-540-9101
NSN: 5310-00-409-1753
FSC: 5310 — Nuts and Washers
CAGE: 99193 — HONEYWELL INTERNATIONAL INC. DBA HONEYWELL INTERNATIONAL DIV AEROSPACE - PHOENIX (USA)
SPECIFICATIONS
materialSTEEL COMP 1137 OVERALL
nut_styleHEXAGON
thread_class3B
thread_seriesUNF
overall_height0.377 INCHES MAXIMUM IN
locking_featureFREE-RUNNING ALL METAL DESIGN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
width_across_flats0.428 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
nominal_thread_size0.250 INCHES IN
washer_outside_diameter0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN
thread_quantity_per_inch28
NSN5310-00-409-1753
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 525-540-9101 · 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: 0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.428 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: AMS 2400 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNF
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5024 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.377 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.428 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS 2400 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNF
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5024 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.250 INCHES IN
LOCKING FEATUREFREE-RUNNING ALL METAL DESIGN
SURFACE TREATMENTCADMIUM OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
0428CC30Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
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 525-540-9101?
525-540-9101 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace 525-540-9101?
There is 1 known substitute for 525-540-9101: 0428CC30. Substitute compatibility should be verified for your specific system.
What is the NSN for 525-540-9101?
525-540-9101 is cataloged in the U.S. Government catalog under NSN 5310-00-409-1753. This indicates validated use in U.S. government and defense supply chains.
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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.