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Technical Data Sheet
PartsTable / COMPONENT / QQ-N-281, GRADE 400, CLASS A
QQ-N-281, GRADE 400, CLASS A ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The QQ-N-281, GRADE 400, CLASS A is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-226-0114, 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 400, CLASS A
NSN: 5305-01-226-0114
FSC: 5305
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part NumberQQ-N-281, GRADE 400, CLASS A
NSN5305-01-226-0114
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: QQ-N-281, GRADE 400, CLASS A · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 1/2X13X5 INLG SIZE AND 2A CLASS A
•
MATERIAL: NICKEL ALLOY OVERALL
•
DEPARTURE FROM CITED DOCUMENT: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMSOL INSTRUCTION FOR LEVEL 1 ITEMS
•
CRITICALITY CODE JUSTIFICATION: ZZZW
TECHNICAL CHARACTERISTICS (FLIS)
NONDEFINITIVE SPEC/STD DATA1 TYPE AND 1/2X13X5 INLG SIZE AND 2A CLASS A
MATERIALNICKEL ALLOY OVERALL
DEPARTURE FROM CITED DOCUMENTMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMSOL INSTRUCTION FOR LEVEL 1 ITEMS
CRITICALITY CODE JUSTIFICATIONZZZW
VERIFIED SUBSTITUTES & CROSS-REFERENCES 31
5/8-11UNC-2A X 4 1/2 INCHESL1Interchangeable
interchangeable cross-reference
interchangeable
QQ-N-281 GRADE 400, CLASS AInterchangeable
interchangeable cross-reference
interchangeable
5/8-11UNC-2A X 4 1/2 INCHESInterchangeable
interchangeable cross-reference
interchangeable
QQ-N-281 GRADE 400 CLASS AL1Interchangeable
interchangeable cross-reference
interchangeable
1/2-13UNC-2A X 1 1/2 INCHESL1Interchangeable
interchangeable cross-reference
interchangeable
QQ-N-281 GRADE 400 CLASS AInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is QQ-N-281, GRADE 400, CLASS A?
QQ-N-281, GRADE 400, CLASS A is a QQ-N-281, GRADE 400, CLASS A.
What parts can replace QQ-N-281, GRADE 400, CLASS A?
There are 31 known substitutes for QQ-N-281, GRADE 400, CLASS A: 5/8-11UNC-2A X 4 1/2 INCHESL1, QQ-N-281 GRADE 400, CLASS A, 5/8-11UNC-2A X 4 1/2 INCHES and 28 more. Substitute compatibility should be verified for your specific system.
What is the NSN for QQ-N-281, GRADE 400, CLASS A?
QQ-N-281, GRADE 400, CLASS A is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-226-0114. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026