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PartsTable / COMPONENT / QQ-N-281 GRADE 400 (CLASS A)L1
QQ-N-281 GRADE 400 (CLASS A)L1 ✓ 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)L1 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 5305-01-302-5220, 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)L1
NSN: 5305-01-302-5220
FSC: 5305
CAGE: 03950 — NAVAL INVENTORY CONTROL POINT MECHANICSBURG (USA)
SPECIFICATIONS
Part NumberQQ-N-281 GRADE 400 (CLASS A)L1
NSN5305-01-302-5220
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: QQ-N-281 GRADE 400 (CLASS A)L1 · 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
•
HEAD STYLE: HEXAGON
•
THREAD QUANTITY PER INCH: 13
•
THREAD LENGTH: 3.000 INCHES NOMINAL IN
•
MATERIAL: NICKEL ALLOY OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-281,CLA FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
HEAD HEIGHT: 0.302 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN
•
MINIMUM TENSILE STRENGTH: 70000 POUNDS PER SQUARE INCH LBS
•
DEPARTURE FROM CITED DESIGNATOR: QUALITY CONTROL IAW NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS
TECHNICAL CHARACTERISTICS (FLIS)
HEAD STYLEHEXAGON
THREAD QUANTITY PER INCH13
THREAD LENGTH3.000 INCHES NOMINAL IN
MATERIALNICKEL ALLOY OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-281,CLA FED SPEC SINGLE MATERIAL RESPONSE OVERALL
HEAD HEIGHT0.302 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN
MINIMUM TENSILE STRENGTH70000 POUNDS PER SQUARE INCH LBS
DEPARTURE FROM CITED DESIGNATORQUALITY CONTROL IAW NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS
NONDEFINITIVE SPEC/STD DATA1 TYPE
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
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
1/2-13UNC-2Z X 5, TYI CLASS AL1Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222L1Interchangeable
interchangeable cross-reference
interchangeable
QQ-N-281, GRADE 400, CLASS AL1Interchangeable
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)L1?
QQ-N-281 GRADE 400 (CLASS A)L1 is a QQ-N-281 GRADE 400 (CLASS A)L1.
What parts can replace QQ-N-281 GRADE 400 (CLASS A)L1?
There are 29 known substitutes for QQ-N-281 GRADE 400 (CLASS A)L1: 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 26 more. Substitute compatibility should be verified for your specific system.
What is the NSN for QQ-N-281 GRADE 400 (CLASS A)L1?
QQ-N-281 GRADE 400 (CLASS A)L1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-302-5220. 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