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PartsTable / COMPONENT / MIL-S-1222 TYI STY A
MIL-S-1222 TYI STY A ✓ 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 NUT,PLAIN,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, nut_height: 0.547 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), hardness_rating: 23.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-202-6169, 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 TYI STY A
NSN: 5310-01-202-6169
FSC: 5310
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height0.547 INCHES NOMINAL IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
hardness_rating23.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
thread_directionRIGHT-HAND
width_across_flats0.937 INCHES NOMINAL IN
nominal_thread_size0.625 INCHES IN
thread_quantity_per_inch11
departure_from_cited_documentMATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS
criticality_code_justificationZZZW
NSN5310-01-202-6169
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MIL-S-1222 TYI STY A · 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 QUANTITY PER INCH: 11
•
HARDNESS RATING: 23.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
CRITICALITY CODE JUSTIFICATION: ZZZW
•
NOMINAL THREAD SIZE: 0.625 INCHES IN
•
NUT STYLE: HEXAGON
•
MATERIAL DOCUMENT AND CLASSIFICATION: FED-STD-66,GRADE 5 FED STD SINGLE MATERIAL RESPONSE OVERALL
•
NUT HEIGHT: 0.547 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH11
HARDNESS RATING23.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
CRITICALITY CODE JUSTIFICATIONZZZW
NOMINAL THREAD SIZE0.625 INCHES IN
NUT STYLEHEXAGON
MATERIAL DOCUMENT AND CLASSIFICATIONFED-STD-66,GRADE 5 FED STD SINGLE MATERIAL RESPONSE OVERALL
NUT HEIGHT0.547 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
WIDTH ACROSS FLATS0.937 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
000.625-11UNC-2BInterchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222Interchangeable
interchangeable cross-reference
interchangeable
MIL-S-1222Interchangeable
interchangeable cross-reference
interchangeable
MIL-S-1222/QQ-N-281Interchangeable
interchangeable cross-reference
interchangeable
214-4364090 ITEM 34Interchangeable
interchangeable cross-reference
interchangeable
MIL-S-1222GInterchangeable
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 TYI STY A?
MIL-S-1222 TYI STY A is a NUT,PLAIN,HEXAGON.
What parts can replace MIL-S-1222 TYI STY A?
There are 14 known substitutes for MIL-S-1222 TYI STY A: 000.625-11UNC-2B, MIL-DTL-1222, MIL-S-1222 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-S-1222 TYI STY A?
MIL-S-1222 TYI STY A is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-202-6169. 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