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PartsTable / COMPONENT / MILS1222-QQN281-5/8-11UNC2BTY1
MILS1222-QQN281-5/8-11UNC2BTY1 ✓ Verified by PartsTable
— · 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 MILS1222-QQN281-5/8-11UNC2BTY1 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 5310-01-202-3426, 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
MILS1222-QQN281-5/8-11UNC2BTY1
NSN: 5310-01-202-3426
FSC: 5310
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part NumberMILS1222-QQN281-5/8-11UNC2BTY1
NSN5310-01-202-3426
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MILS1222-QQN281-5/8-11UNC2BTY1 · 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 CLASS: 2B
•
BEARING SURFACE TYPE: WASHER FACED
•
THREAD QUANTITY PER INCH: 11
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
CRITICALITY CODE JUSTIFICATION: ZZZW
•
NOMINAL THREAD SIZE: 0.625 INCHES IN
•
NUT STYLE: HEXAGON
•
WIDTH ACROSS FLATS: 0.932 INCHES MINIMUM AND 0.938 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2B
BEARING SURFACE TYPEWASHER FACED
THREAD QUANTITY PER INCH11
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
CRITICALITY CODE JUSTIFICATIONZZZW
NOMINAL THREAD SIZE0.625 INCHES IN
NUT STYLEHEXAGON
WIDTH ACROSS FLATS0.932 INCHES MINIMUM AND 0.938 INCHES MAXIMUM IN
DEPARTURE FROM CITED DOCUMENTMATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
000.625-11UNC-2BInterchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222Interchangeable
interchangeable cross-reference
interchangeable
MIL-S-1222Interchangeable
interchangeable cross-reference
interchangeable
000.875-09UNC-2BInterchangeable
interchangeable cross-reference
interchangeable
MIL-S-1222/QQ-N-281Interchangeable
interchangeable cross-reference
interchangeable
000.750-10UNC-2BInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MILS1222-QQN281-5/8-11UNC2BTY1?
MILS1222-QQN281-5/8-11UNC2BTY1 is a MILS1222-QQN281-5/8-11UNC2BTY1.
What parts can replace MILS1222-QQN281-5/8-11UNC2BTY1?
There are 10 known substitutes for MILS1222-QQN281-5/8-11UNC2BTY1: 000.625-11UNC-2B, MIL-DTL-1222, MIL-S-1222 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MILS1222-QQN281-5/8-11UNC2BTY1?
MILS1222-QQN281-5/8-11UNC2BTY1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-202-3426. 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