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Technical Data Sheet
PartsTable / COMPONENT / MIL-S-1222H
MIL-S-1222H ✓ 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,PLAIN is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY 400 OVERALL, nut_style: HEXAGON, head_style: HEXAGON, nut_height: 0.320 INCHES MINIMUM AND 0.337 INCHES MAXIMUM IN, thread_class: 3A A, thread_series: UNIFIED NATIONAL COARSE (UNC). This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-226-9220, 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-1222H
NSN: 5305-00-226-9220
FSC: 5305
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialNICKEL ALLOY 400 OVERALL
nut_styleHEXAGON
head_styleHEXAGON
nut_height0.320 INCHES MINIMUM AND 0.337 INCHES MAXIMUM IN
thread_class3A A
thread_seriesUNIFIED NATIONAL COARSE (UNC)
fastener_length2.500 INCHES NOMINAL IN
hardness_rating80.0 ROCKWELL B MINIMUM OVERALL
thread_directionRIGHT-HAND
width_across_flats0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
nominal_thread_size0.375 INCHES IN
bearing_surface_typeCHAMFERED OR WASHER FACED
NSN5305-00-226-9220
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MIL-S-1222H · 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
•
FASTENER LENGTH: 2.500 INCHES NOMINAL IN
•
WIDTH BETWEEN FLATS: 1.100 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.455 INCHES MINIMUM AND 0.483 INCHES MAXIMUM IN
•
THREAD CLASS: 2A A
•
HEAD STYLE: HEXAGON
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
MATERIAL: NICKEL ALLOY 400 OR NICKEL ALLOY R-405 OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-281 FED SPEC ALL MATERIAL RESPONSES OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
FASTENER LENGTH2.500 INCHES NOMINAL IN
WIDTH BETWEEN FLATS1.100 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN
HEAD HEIGHT0.455 INCHES MINIMUM AND 0.483 INCHES MAXIMUM IN
THREAD CLASS2A A
HEAD STYLEHEXAGON
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
MATERIALNICKEL ALLOY 400 OR NICKEL ALLOY R-405 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-281 FED SPEC ALL MATERIAL RESPONSES OVERALL
THREAD QUANTITY PER INCH10
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
5/8-11 UNC-2A X 3.00 LGInterchangeable
interchangeable cross-reference
interchangeable
MIL-S-1222HInterchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222JInterchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222TYPE1STYLEAInterchangeable
interchangeable cross-reference
interchangeable
QQ-N-281DCLASSAALLOY400Interchangeable
interchangeable cross-reference
interchangeable
MILB857TYPEBInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-S-1222H?
MIL-S-1222H is a STUD,PLAIN.
What parts can replace MIL-S-1222H?
There are 18 known substitutes for MIL-S-1222H: 5/8-11 UNC-2A X 3.00 LG, MIL-S-1222H, MIL-DTL-1222J and 15 more. Substitute compatibility should be verified for your specific system.
Is MIL-S-1222H still available?
MIL-S-1222H is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026