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A51B52591-11 — NUT,PLAIN,RECTANGULAR

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

A51B52591-11: NUT,PLAIN,RECTANGULAR.

The NUT,PLAIN,RECTANGULAR is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4130 OVERALL, nut_style: PLAIN, RECTANGULAR, nut_width: 0.420 INCHES NOMINAL IN, nut_height: 0.125 INCHES NOMINAL IN, nut_length: 0.540 INCHES NOMINAL IN, thread_class: 3B. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-092-0996, 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
A51B52591-11
NSN: 5310-01-092-0996
FSC: 5310 — Nuts and Washers
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL COMP 4130 OVERALL
nut_stylePLAIN, RECTANGULAR
nut_width0.420 INCHES NOMINAL IN
nut_height0.125 INCHES NOMINAL IN
nut_length0.540 INCHES NOMINAL IN
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
special_featuresONE END CHAMFERED 0.040 IN. X 45 DEG BOTH SURFACES AND ONE CORNER OF OPPOSITE END CHAMFERED 0.160 IN. X 45 DEG IN
thread_directionRIGHT-HAND
nominal_thread_size0.250 INCHES IN
thread_quantity_per_inch28
material_document_and_classificationMIL-S-18729 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-092-0996
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A51B52591-11 · 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
•
NUT WIDTH: 0.420 INCHES NOMINAL IN
•
NUT LENGTH: 0.540 INCHES NOMINAL IN
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-18729 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
NUT HEIGHT: 0.125 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
NUT WIDTH0.420 INCHES NOMINAL IN
NUT LENGTH0.540 INCHES NOMINAL IN
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-18729 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.250 INCHES IN
NUT HEIGHT0.125 INCHES NOMINAL IN
SPECIAL FEATURESONE END CHAMFERED 0.040 IN. X 45 DEG BOTH SURFACES AND ONE CORNER OF OPPOSITE END CHAMFERED 0.160 IN. X 45 DEG IN
NUT STYLEPLAIN, RECTANGULAR
THREAD CLASS3B
SUBSTITUTES & CROSS-REFERENCES 2
A51B52591-411Reference document
Same NSN cross-reference
Reference document — Secondary reference
A512A51B52591-411Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 A51B52591-11?
A51B52591-11 is a NUT,PLAIN,RECTANGULAR.
What parts can replace A51B52591-11?
There are 2 known substitutes for A51B52591-11: A51B52591-411, A512A51B52591-411. Substitute compatibility should be verified for your specific system.
What is the NSN for A51B52591-11?
A51B52591-11 is cataloged in the U.S. Government catalog under NSN 5310-01-092-0996. 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.