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Technical Data Sheet
PartsTable / COMPONENT / QQ-N-281 GR400 CLASS A
QQ-N-281 GR400 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 STUD,CONTINUOUS THREAD is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY 400, thread_class: 3A LOCATION NOT OTHERWISE SPECIFIED A, heat_treatment: STRESS RELIEVED, overall_length: 2.000 INCHES NOMINAL IN, hardness_rating: 25.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM, thread_direction: RIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-00-485-9941, 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 GR400 CLASS A
NSN: 5307-00-485-9941
FSC: 5307
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialNICKEL ALLOY 400
thread_class3A LOCATION NOT OTHERWISE SPECIFIED A
heat_treatmentSTRESS RELIEVED
overall_length2.000 INCHES NOMINAL IN
hardness_rating25.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
thread_directionRIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
basic_shape_styleROUND
fabrication_methodCOLD DRAWN
nominal_thread_size0.625 INCHES LOCATION NOT OTHERWISE SPECIFIED IN
thread_quantity_per_inch11 LOCATION NOT OTHERWISE SPECIFIED
thread_series_designatorUNIFIED NATIONAL COARSE (UNC) LOCATION NOT OTHERWISE SPECIFIED
nondefinitive_spec/std_dataIV TYPE
NSN5307-00-485-9941
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: QQ-N-281 GR400 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
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A193-62T ASSN STD SINGLE MATERIAL RESPONSE
•
THREAD CLASS: 2A LOCATION NOT OTHERWISE SPECIFIED A
•
HARDNESS RATING: 25.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
•
THREAD QUANTITY PER INCH: 11 LOCATION NOT OTHERWISE SPECIFIED
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC) LOCATION NOT OTHERWISE SPECIFIED
•
THREAD DIRECTION: RIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
•
MATERIAL: STEEL
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A193-62T ASSN STD SINGLE MATERIAL RESPONSE
OVERALL LENGTH3.687 INCHES MINIMUM AND 3.813 INCHES MAXIMUM IN
THREAD CLASS2A LOCATION NOT OTHERWISE SPECIFIED A
HARDNESS RATING25.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
THREAD QUANTITY PER INCH11 LOCATION NOT OTHERWISE SPECIFIED
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC) LOCATION NOT OTHERWISE SPECIFIED
THREAD DIRECTIONRIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
MATERIALSTEEL
NONDEFINITIVE SPEC/STD DATA4 TYPE
NOMINAL THREAD SIZE0.625 INCHES LOCATION NOT OTHERWISE SPECIFIED IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
3/4 IN (ROUND)FORM 1L1Interchangeable
interchangeable cross-reference
interchangeable
QQ-N-281 GR400 CLASS AL1Interchangeable
interchangeable cross-reference
interchangeable
QQ-N-281 GR400 CLASS AInterchangeable
interchangeable cross-reference
interchangeable
5/8-11UNC-3A X 2L1Interchangeable
interchangeable cross-reference
interchangeable
5/8-11UNC-3A X 2Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222 TYPE IVL1Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is QQ-N-281 GR400 CLASS A?
QQ-N-281 GR400 CLASS A is a STUD,CONTINUOUS THREAD.
What parts can replace QQ-N-281 GR400 CLASS A?
There are 7 known substitutes for QQ-N-281 GR400 CLASS A: 3/4 IN (ROUND)FORM 1L1, QQ-N-281 GR400 CLASS AL1, QQ-N-281 GR400 CLASS A and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for QQ-N-281 GR400 CLASS A?
QQ-N-281 GR400 CLASS A is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-00-485-9941. 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