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6212903 — BOLT,SQUARE NECK

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

6212903: BOLT,SQUARE NECK.

The BOLT,SQUARE NECK is a the manufacturer industrial component. Key specifications include head_style: ROUND, neck_width: 0.616 INCHES MINIMUM AND 0.642 INCHES MAXIMUM IN, head_height: 0.313 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN, neck_length: 0.313 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 1.219 INCHES MINIMUM AND 1.344 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-326-9488, 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
6212903
NSN: 5306-01-326-9488
FSC: 5306 — Bolts
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialSTEEL COMP 302 OR STEEL COMP 302B OR STEEL COMP 303 OR STEEL COMP 303 PLUS X OR STEEL COMP 303SE OR STEEL COMP 303CU OR STEEL COMP 303MA OR STEEL COMP 304 OR STEEL COMP 304L OVERALL
head_styleROUND
neck_width0.616 INCHES MINIMUM AND 0.642 INCHES MAXIMUM IN
head_height0.313 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN
neck_length0.313 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN
thread_class2A A
head_diameter1.219 INCHES MINIMUM AND 1.344 INCHES MAXIMUM IN
thread_length1.039 INCHES MINIMUM AND 1.372 INCHES MAXIMUM IN
fastener_length1.565 INCHES MINIMUM AND 1.685 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
nominal_thread_diameter0.625 INCHES IN
thread_quantity_per_inch11
NSN5306-01-326-9488
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 6212903 · 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
•
NECK LENGTH: 0.313 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.313 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.565 INCHES MINIMUM AND 1.685 INCHES MAXIMUM IN
•
THREAD LENGTH: 1.039 INCHES MINIMUM AND 1.372 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.625 INCHES IN
•
HEAD STYLE: ROUND
•
THREAD DIRECTION: RIGHT-HAND
•
NECK WIDTH: 0.616 INCHES MINIMUM AND 0.642 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
NECK LENGTH0.313 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN
HEAD HEIGHT0.313 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN
FASTENER LENGTH1.565 INCHES MINIMUM AND 1.685 INCHES MAXIMUM IN
THREAD LENGTH1.039 INCHES MINIMUM AND 1.372 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.625 INCHES IN
HEAD STYLEROUND
THREAD DIRECTIONRIGHT-HAND
NECK WIDTH0.616 INCHES MINIMUM AND 0.642 INCHES MAXIMUM IN
PART NAME ASSIGNED BY CONTROLLING AGENCYNAVY SPECIAL PROJECT
THREAD CLASS2A A
OTHER ITEMS IN FSC 5306 — Bolts
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5306-00-001-1276 5306-00-001-1949 5306-00-001-1988 5306-00-001-1989 5306-00-001-1990 5306-00-001-1991 5306-00-001-1993 5306-00-001-2017
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 6212903?
6212903 is a BOLT,SQUARE NECK.
What is the NSN for 6212903?
6212903 is cataloged in the U.S. Government catalog under NSN 5306-01-326-9488. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.