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MBEU141587 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

MBEU141587: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: STEEL COMP 4130 OR STEEL COMP 4340 OR STEEL COMP 3140 OR STEEL COMP 8740 NUT, nut_style: DOUBLE HEXAGON, temp_rating: 250.0 FAHRENHEIT NOMINAL DEGF, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), overall_height: 0.563 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-297-3721, 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
MBEU141587
NSN: 5310-00-297-3721
FSC: 5310 — Nuts and Washers
CAGE: U1604 — MARTIN-BAKER AIRCRAFT COMPANY LIMITED (GBR)
SPECIFICATIONS
materialSTEEL COMP 4130 OR STEEL COMP 4340 OR STEEL COMP 3140 OR STEEL COMP 8740 NUT
nut_styleDOUBLE HEXAGON
temp_rating250.0 FAHRENHEIT NOMINAL DEGF
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
overall_height0.563 INCHES NOMINAL IN
locking_featurePREVAILING TORQUE WITH NONMETALLIC INSERT
thread_directionRIGHT-HAND
washer_thickness0.118 INCHES NOMINAL IN
surface_treatmentCADMIUM OVERALL EXCEPT INSERT
width_across_flats0.612 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN
nominal_thread_size0.500 INCHES IN
NSN5310-00-297-3721
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MBEU141587 · 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: 0.865 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.612 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL EXCEPT INSERT
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
TEMP RATING: 250.0 FAHRENHEIT NOMINAL DEGF
•
WASHER THICKNESS: 0.118 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI ASSN STD ALL MATERIAL RESPONSES NUT
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.563 INCHES NOMINAL IN
WASHER OUTSIDE DIAMETER0.865 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.612 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL EXCEPT INSERT
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
TEMP RATING250.0 FAHRENHEIT NOMINAL DEGF
WASHER THICKNESS0.118 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAISI ASSN STD ALL MATERIAL RESPONSES NUT
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.500 INCHES IN
SUBSTITUTES & CROSS-REFERENCES 7
SS5088-07Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
10177803Reference document
Same NSN cross-reference
Reference document — Informative reference only
53-60100-5Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
035534AReference document
Same NSN cross-reference
Reference document — Secondary reference
P30364Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
EB-080Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MBEU141587?
MBEU141587 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace MBEU141587?
There are 7 known substitutes for MBEU141587: SS5088-07, 10177803, 53-60100-5 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MBEU141587?
MBEU141587 is cataloged in the U.S. Government catalog under NSN 5310-00-297-3721. 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.