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PartsTable / COMPONENT / MILS1222
MILS1222 ✓ 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 SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY, thread_class: 3A STUD THREAD A, overall_length: 4.750 INCHES NOMINAL IN, thread_direction: RIGHT-HAND STUD THREAD, nominal_thread_size: 0.625 INCHES STUD THREAD IN, thread_quantity_per_inch: 11 STUD THREAD. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-010-8587, 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
NSN: 5306-00-010-8587
FSC: 5306
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialNICKEL ALLOY
thread_class3A STUD THREAD A
overall_length4.750 INCHES NOMINAL IN
thread_directionRIGHT-HAND STUD THREAD
nominal_thread_size0.625 INCHES STUD THREAD IN
thread_quantity_per_inch11 STUD THREAD
thread_series_designatorUNIFIED NATIONAL COARSE (UNC) STUD THREAD
material_document_and_classificationQQ-N-286,CL A FED SPEC SINGLE MATERIAL RESPONSE
part_name_assigned_by_controlling_agencySTUDBOLT
NSN5306-00-010-8587
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MILS1222 · 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
•
NOMINAL THREAD DIAMETER: 0.312 INCHES IN
•
FASTENER LENGTH: 1.625 INCHES NOMINAL IN
•
MINIMUM TENSILE STRENGTH: 75000 POUNDS PER SQUARE INCH LBS
•
HEAD STYLE: HEXAGON
•
FEATURES PROVIDED: FINISHED HEAD
•
HEAD HEIGHT: 0.203 INCHES NOMINAL IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD DIAMETER0.312 INCHES IN
FASTENER LENGTH1.625 INCHES NOMINAL IN
MINIMUM TENSILE STRENGTH75000 POUNDS PER SQUARE INCH LBS
HEAD STYLEHEXAGON
FEATURES PROVIDEDFINISHED HEAD
HEAD HEIGHT0.203 INCHES NOMINAL IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
THREAD DIRECTIONRIGHT-HAND
NONDEFINITIVE SPEC/STD DATA1 TYPE
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
MIL-S-1222Upgraded Successor
successor cross-reference
successor
FFB575Upgraded Successor
successor cross-reference
successor
M1222B2N6C228GCNZEUpgraded Successor
successor cross-reference
successor
45594Interchangeable
interchangeable cross-reference
interchangeable
55099Interchangeable
interchangeable cross-reference
interchangeable
159724Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MILS1222?
MILS1222 is a SCREW,CAP,HEXAGON HEAD.
What parts can replace MILS1222?
There are 9 known substitutes for MILS1222: MIL-S-1222, FFB575, M1222B2N6C228GCNZE and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MILS1222?
MILS1222 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-010-8587. 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