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PartsTable / COMPONENT / QQ-N-281, GRADE 405, CLASS BL1

QQ-N-281, GRADE 405, CLASS BL1 — Technical Data Sheet

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— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The NUT,PLAIN,HEXAGON is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY R-405 OVERALL, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), thread_direction: RIGHT-HAND, nominal_thread_size: 1.000 INCHES IN, special_test_features: AS DIFFERENTIATED BY MATERIAL-NO SUBSTITUTE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 5310-01-269-0358, 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
QQ-N-281, GRADE 405, CLASS BL1
NSN: 5310-01-269-0358
FSC: 5310
CAGE: 03950 — NAVAL INVENTORY CONTROL POINT MECHANICSBURG (USA)
SPECIFICATIONS
materialNICKEL ALLOY R-405 OVERALL
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
thread_directionRIGHT-HAND
nominal_thread_size1.000 INCHES IN
special_test_featuresAS DIFFERENTIATED BY MATERIAL-NO SUBSTITUTE
thread_quantity_per_inch8
nondefinitive_spec/std_dataA STYLE AND 1 TYPE
departure_from_cited_documentMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
criticality_code_justificationZZZW
material_document_and_classificationQQ-N-281,CL B FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-269-0358
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: QQ-N-281, GRADE 405, CLASS BL1 · 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
•
THREAD QUANTITY PER INCH: 8
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
THREAD DIRECTION: RIGHT-HAND
•
NONDEFINITIVE SPEC/STD DATA: A STYLE AND 1 TYPE
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-281,CL B FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
DEPARTURE FROM CITED DOCUMENT: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
•
SPECIAL TEST FEATURES: AS DIFFERENTIATED BY MATERIAL-NO SUBSTITUTE
•
NOMINAL THREAD SIZE: 1.000 INCHES IN
TECHNICAL CHARACTERISTICS
THREAD QUANTITY PER INCH8
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
THREAD DIRECTIONRIGHT-HAND
NONDEFINITIVE SPEC/STD DATAA STYLE AND 1 TYPE
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-281,CL B FED SPEC SINGLE MATERIAL RESPONSE OVERALL
DEPARTURE FROM CITED DOCUMENTMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
SPECIAL TEST FEATURESAS DIFFERENTIATED BY MATERIAL-NO SUBSTITUTE
NOMINAL THREAD SIZE1.000 INCHES IN
MATERIALNICKEL ALLOY R-405 OVERALL
CRITICALITY CODE JUSTIFICATIONZZZW
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
MS17829-16C(MOD )InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
122-6776881 PC 4InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
122-6776003 PC 16InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
5/8-11UNC-2A X 4 1/2 INCHESL1InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
QQ-N-281 GRADE 400, CLASS AInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
5/8-11UNC-2A X 4 1/2 INCHESInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is QQ-N-281, GRADE 405, CLASS BL1?
QQ-N-281, GRADE 405, CLASS BL1 is a NUT,PLAIN,HEXAGON.
What parts can replace QQ-N-281, GRADE 405, CLASS BL1?
There are 27 known substitutes for QQ-N-281, GRADE 405, CLASS BL1: MS17829-16C(MOD ), 122-6776881 PC 4, 122-6776003 PC 16 and 24 more. Substitute compatibility should be verified for your specific system.
What is the NSN for QQ-N-281, GRADE 405, CLASS BL1?
QQ-N-281, GRADE 405, CLASS BL1 is cataloged in the Federal Logistics Information System under NSN 5310-01-269-0358. This indicates validated use in U.S. government and defense supply chains.
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Last verified: October 2026