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VS3251-4-3 — BOLT,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

VS3251-4-3: BOLT,SHOULDER.

The BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include head_style: DISHED HEXAGON, head_height: 0.156 INCHES MINIMUM AND 0.171 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.371 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN, shoulder_shape: ROUND FIRST SHOULDER, fastener_length: 0.598 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-352-0663, 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
VS3251-4-3
NSN: 5306-00-352-0663
FSC: 5306 — Bolts
CAGE: 06950 — HOWMET GLOBAL FASTENING SYSTEMS INC (USA)
SPECIFICATIONS
head_styleDISHED HEXAGON
head_height0.156 INCHES MINIMUM AND 0.171 INCHES MAXIMUM IN
thread_class3A A
thread_length0.371 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length0.598 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN
shoulder_length0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM FIRST SHOULDER IN
shoulder_diameter0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM FIRST SHOULDER IN
surface_treatmentPASSIVATE OVERALL
width_between_flats0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN
nominal_thread_diameter0.250 INCHES IN
thread_quantity_per_inch28
NSN5306-00-352-0663
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: VS3251-4-3 · 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: 0.156 INCHES MINIMUM AND 0.171 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.598 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM FIRST SHOULDER IN
•
SHOULDER DIAMETER: 0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.371 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD STYLE: DISHED HEXAGON
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.156 INCHES MINIMUM AND 0.171 INCHES MAXIMUM IN
FASTENER LENGTH0.598 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN
SHOULDER LENGTH0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM FIRST SHOULDER IN
SHOULDER DIAMETER0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.371 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEDISHED HEXAGON
WIDTH BETWEEN FLATS0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN
SURFACE TREATMENTPASSIVATE OVERALL
OTHER ITEMS IN FSC 5306 — Bolts
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5306-00-004-7044 5306-00-007-6129 5306-00-008-7899 5306-00-009-4739 5306-00-118-7332 5306-00-151-1777 5306-00-255-4507 5306-01-101-2459
SUBSTITUTES & CROSS-REFERENCES 3
ST3M494-4-3Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
S11-1065-4-3Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
PBF1263-4-3Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is VS3251-4-3?
VS3251-4-3 is a BOLT,SHOULDER.
What parts can replace VS3251-4-3?
There are 3 known substitutes for VS3251-4-3: ST3M494-4-3, S11-1065-4-3, PBF1263-4-3. Substitute compatibility should be verified for your specific system.
What is the NSN for VS3251-4-3?
VS3251-4-3 is cataloged in the U.S. Government catalog under NSN 5306-00-352-0663. 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.