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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 SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY OVERALL, head_style: HEXAGON, head_height: 0.642 INCHES MINIMUM AND 0.656 INCHES MAXIMUM IN, thread_class: 3B, thread_length: 1.000 INCHES NOMINAL IN, thread_series: UN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-065-8335, 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: 5305-01-065-8335
FSC: 5305
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialNICKEL ALLOY OVERALL
head_styleHEXAGON
head_height0.642 INCHES MINIMUM AND 0.656 INCHES MAXIMUM IN
thread_class3B
thread_length1.000 INCHES NOMINAL IN
thread_seriesUN
overall_length6.000 INCHES NOMINAL IN
fastener_length3.000 INCHES NOMINAL IN
thread_directionRIGHT-HAND
width_across_flats0.375 INCHES NOMINAL IN
nominal_thread_size1.250 INCHES IN
width_between_flats2.500 INCHES NOMINAL IN
NSN5305-01-065-8335
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
•
CRITICALITY CODE JUSTIFICATION: ZZZX
•
DEPARTURE FROM CITED DESIGNATOR: QUALITY CONTROL IN ACCORDANCE WITH NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTIONS FOR LEVEL 1 ITEMS
TECHNICAL CHARACTERISTICS (FLIS)
CRITICALITY CODE JUSTIFICATIONZZZX
DEPARTURE FROM CITED DESIGNATORQUALITY CONTROL IN ACCORDANCE WITH NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTIONS FOR LEVEL 1 ITEMS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 32
24573N PIECE 22Interchangeable
interchangeable cross-reference
interchangeable
1/2-13 UNC-2B,TYPE 1Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222 TYPE IL1Interchangeable
interchangeable cross-reference
interchangeable
501-4675682 ITEM 4Interchangeable
interchangeable cross-reference
interchangeable
501-4675682 ITEM 4L1Interchangeable
interchangeable cross-reference
interchangeable
1.500-06UNC-2A X 5.000L1Interchangeable
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 SCREW,CAP,HEXAGON HEAD.
What parts can replace QQ-N-281 GRADE 400 CLASS A?
There are 32 known substitutes for QQ-N-281 GRADE 400 CLASS A: 24573N PIECE 22, 1/2-13 UNC-2B,TYPE 1, MIL-DTL-1222 TYPE IL1 and 29 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 5305-01-065-8335. 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