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VBP4178 — BOLT,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

VBP4178: BOLT,CLOSE TOLERANCE.

The BOLT,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include head_style: HEXAGON, grip_length: 1.707 INCHES MINIMUM AND 1.844 INCHES MAXIMUM IN, head_height: 0.428 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.2487 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM IN, thread_length: 0.500 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-561-4178, 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
VBP4178
NSN: 5306-00-561-4178
FSC: 5306 — Bolts
CAGE: 53037 — HC MERCHANDISERS, INC. DBA HC MERCHANDISERS INC DIV HC PACIFIC (USA)
SPECIFICATIONS
materialSTEEL COMP 4037 OR STEEL COMP 4130 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 8740 OR STEEL COMP 4140 OVERALL
head_styleHEXAGON
grip_length1.707 INCHES MINIMUM AND 1.844 INCHES MAXIMUM IN
head_height0.428 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.2487 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM IN
thread_length0.500 INCHES NOMINAL IN
fastener_length2.265 INCHES MINIMUM AND 2.312 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM HEAD
width_between_flats0.140 INCHES MINIMUM AND 0.172 INCHES MAXIMUM IN
nominal_thread_diameter0.250 INCHES IN
NSN5306-00-561-4178
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: VBP4178 · 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: 0.428 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
•
FASTENER LENGTH: 2.265 INCHES MINIMUM AND 2.312 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE HEAD
•
THREAD LENGTH: 0.500 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-B-6812 MIL SPEC ALL MATERIAL RESPONSES OVERALL
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.428 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
FASTENER LENGTH2.265 INCHES MINIMUM AND 2.312 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE HEAD
THREAD LENGTH0.500 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-B-6812 MIL SPEC ALL MATERIAL RESPONSES OVERALL
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH1.707 INCHES MINIMUM AND 1.844 INCHES MAXIMUM IN
WIDTH BETWEEN FLATS0.140 INCHES MINIMUM AND 0.172 INCHES MAXIMUM IN
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
5306H34-001Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is VBP4178?
VBP4178 is a BOLT,CLOSE TOLERANCE.
What parts can replace VBP4178?
There is 1 known substitute for VBP4178: 5306H34-001. Substitute compatibility should be verified for your specific system.
What is the NSN for VBP4178?
VBP4178 is cataloged in the U.S. Government catalog under NSN 5306-00-561-4178. 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.