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PartsTable / COMPONENT / MIL-S-1222/QQ-M-281
MIL-S-1222/QQ-M-281 ✓ 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 MIL-S-1222/QQ-M-281 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 5310-01-147-8669, 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
MIL-S-1222/QQ-M-281
NSN: 5310-01-147-8669
FSC: 5310
CAGE: 03950 — NAVAL INVENTORY CONTROL POINT MECHANICSBURG (USA)
SPECIFICATIONS
Part NumberMIL-S-1222/QQ-M-281
NSN5310-01-147-8669
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MIL-S-1222/QQ-M-281 · 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 DIRECTION: RIGHT-HAND
•
NONDEFINITIVE SPEC/STD DATA: B CLASS AND A STYLE AND 1 TYPE
•
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS: MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS
•
WIDTH ACROSS FLATS: 0.750 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.500 INCHES IN
•
CRITICALITY CODE JUSTIFICATION: ZZZY
•
BEARING SURFACE TYPE: WASHER FACED
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
NONDEFINITIVE SPEC/STD DATAB CLASS AND A STYLE AND 1 TYPE
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICSMATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS
WIDTH ACROSS FLATS0.750 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.500 INCHES IN
CRITICALITY CODE JUSTIFICATIONZZZY
BEARING SURFACE TYPEWASHER FACED
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
THREAD QUANTITY PER INCH13
THREAD CLASS2B
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
216-4363288MT-F44Interchangeable
interchangeable cross-reference
interchangeable
MIL-S-1222/QQ-S-763Interchangeable
interchangeable cross-reference
interchangeable
000.500-13UNC-2BInterchangeable
interchangeable cross-reference
interchangeable
MIL-S-1222G 1/2IN 13UNCInterchangeable
interchangeable cross-reference
interchangeable
MIL-S-1222GInterchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-S-1222/QQ-M-281?
MIL-S-1222/QQ-M-281 is a MIL-S-1222/QQ-M-281.
What parts can replace MIL-S-1222/QQ-M-281?
There are 13 known substitutes for MIL-S-1222/QQ-M-281: 216-4363288MT-F44, MIL-S-1222/QQ-S-763, 000.500-13UNC-2B and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-S-1222/QQ-M-281?
MIL-S-1222/QQ-M-281 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-147-8669. 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