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VS3218-4-21 — BOLT,SHEAR

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

VS3218-4-21: BOLT,SHEAR.

The BOLT,SHEAR is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, grip_length: 0.167 INCHES MINIMUM AND 0.182 INCHES MAXIMUM IN, head_height: 0.250 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.4985 INCHES MINIMUM AND 0.4995 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-258-8201, 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
VS3218-4-21
NSN: 5306-01-258-8201
FSC: 5306 — Bolts
CAGE: 92215 — HOWMET GLOBAL FASTENING SYSTEMS INC DIV TORRANCE OPERATIONS (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
grip_length0.167 INCHES MINIMUM AND 0.182 INCHES MAXIMUM IN
head_height0.250 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.4985 INCHES MINIMUM AND 0.4995 INCHES MAXIMUM IN
thread_length0.488 INCHES MINIMUM AND 0.493 INCHES MAXIMUM IN
fastener_length0.330 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
width_between_flats0.836 INCHES NOMINAL IN
nominal_thread_diameter0.500 INCHES IN
thread_quantity_per_inch20
NSN5306-01-258-8201
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: VS3218-4-21 · 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
•
HEAD HEIGHT: 0.250 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.330 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.488 INCHES MINIMUM AND 0.493 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.500 INCHES IN
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
GRIP LENGTH: 0.167 INCHES MINIMUM AND 0.182 INCHES MAXIMUM IN
•
WIDTH BETWEEN FLATS: 0.836 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.250 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN
FASTENER LENGTH0.330 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN
THREAD LENGTH0.488 INCHES MINIMUM AND 0.493 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.500 INCHES IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH0.167 INCHES MINIMUM AND 0.182 INCHES MAXIMUM IN
WIDTH BETWEEN FLATS0.836 INCHES NOMINAL IN
GRIP DIAMETER0.4985 INCHES MINIMUM AND 0.4995 INCHES MAXIMUM IN
THREAD CLASS3A 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 1
ST3M807-4-21Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is VS3218-4-21?
VS3218-4-21 is a BOLT,SHEAR.
What parts can replace VS3218-4-21?
There is 1 known substitute for VS3218-4-21: ST3M807-4-21. Substitute compatibility should be verified for your specific system.
What is the NSN for VS3218-4-21?
VS3218-4-21 is cataloged in the U.S. Government catalog under NSN 5306-01-258-8201. 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.