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S406-4D24 — BOLT,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

S406-4D24: BOLT,CLOSE TOLERANCE.

The BOLT,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, grip_length: 0.250 INCHES NOMINAL IN, head_height: 0.164 INCHES NOMINAL IN, thread_class: 3A A, special_features: NAVY CRITICAL SAFETY ITEM (CSI), surface_treatment: PASSIVATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-411-3857, 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
S406-4D24
NSN: 5306-01-411-3857
FSC: 5306 — Bolts
CAGE: 17446 — HUCK INTERNATIONAL, INC (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
grip_length0.250 INCHES NOMINAL IN
head_height0.164 INCHES NOMINAL IN
thread_class3A A
special_featuresNAVY CRITICAL SAFETY ITEM (CSI)
surface_treatmentPASSIVATE OVERALL
nominal_thread_diameter0.2500 INCHES IN
thread_quantity_per_inch28
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF)
criticality_code_justificationFEAT
part_name_assigned_by_controlling_agencyBOLT-CLOSE TOLERANCE, SPLINE DRIVE, CRES (125 KSI FSU) DRILLED, SHORT THREAD
NSN5306-01-411-3857
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: S406-4D24 · 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: 0.164 INCHES NOMINAL IN
•
SPECIAL TEST FEATURES: MATERIAL PER AMS 5629, STEEL CORROSION RESISTANT, BARS, FORGINGS, RINGS AND EXTRUSIONS, 13CR 8.0NI 2.2MO 1.1 AL, VACUUM INDUCTION PLUS CONSUMABLE ELECTRODE MELTED, SOLUTION HEAT TREATED, PRECIPATION HARDENABLE
•
CRITICALITY CODE JUSTIFICATION: FEAT
•
NOMINAL THREAD DIAMETER: 0.2500 INCHES IN
•
GRIP LENGTH: 0.250 INCHES NOMINAL IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.164 INCHES NOMINAL IN
SPECIAL TEST FEATURESMATERIAL PER AMS 5629, STEEL CORROSION RESISTANT, BARS, FORGINGS, RINGS AND EXTRUSIONS, 13CR 8.0NI 2.2MO 1.1 AL, VACUUM INDUCTION PLUS CONSUMABLE ELECTRODE MELTED, SOLUTION HEAT TREATED, PRECIPATION HARDENABLE
CRITICALITY CODE JUSTIFICATIONFEAT
NOMINAL THREAD DIAMETER0.2500 INCHES IN
GRIP LENGTH0.250 INCHES NOMINAL IN
SPECIAL FEATURESNAVY CRITICAL SAFETY ITEM (CSI)
SURFACE TREATMENTPASSIVATE OVERALL
PART NAME ASSIGNED BY CONTROLLING AGENCYBOLT-CLOSE TOLERANCE, SPLINE DRIVE, CRES (125 KSI FSU) DRILLED, SHORT THREAD
THREAD CLASS3A A
THREAD QUANTITY PER INCH28
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 7
ST3M744-4D24Reference document
Same NSN cross-reference
Reference document — Secondary reference
VCG0001-4D24Reference document
Same NSN cross-reference
Reference document — Secondary reference
PBF1265-4D24Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
122895-4D24Reference document
Same NSN cross-reference
Reference document — Secondary reference
VS3174-4D24Reference document
Same NSN cross-reference
Reference document — Secondary reference
AIC687-4D24Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 S406-4D24?
S406-4D24 is a BOLT,CLOSE TOLERANCE.
What parts can replace S406-4D24?
There are 7 known substitutes for S406-4D24: ST3M744-4D24, VCG0001-4D24, PBF1265-4D24 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for S406-4D24?
S406-4D24 is cataloged in the U.S. Government catalog under NSN 5306-01-411-3857. 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.