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8724979 — BOLT,EXTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

8724979: BOLT,EXTERNALLY RELIEVED BODY.

The BOLT,EXTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include thread_class: 3A A, thread_length: 0.500 INCHES MINIMUM IN, fastener_length: 4.250 INCHES NOMINAL IN, nominal_thread_diameter: 0.625 INCHES IN, first_diameter_from_head: 0.860 INCHES NOMINAL IN, third_diameter_from_head: 0.860 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-678-1887, 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
8724979
NSN: 5306-00-678-1887
FSC: 5306 — Bolts
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
thread_class3A A
thread_length0.500 INCHES MINIMUM IN
fastener_length4.250 INCHES NOMINAL IN
nominal_thread_diameter0.625 INCHES IN
first_diameter_from_head0.860 INCHES NOMINAL IN
third_diameter_from_head0.860 INCHES NOMINAL IN
thread_quantity_per_inch18
thread_series_designatorUNF
fourth_diameter_from_head0.494 INCHES MINIMUM AND 0.498 INCHES MAXIMUM IN
second_diameter_from_head0.860 INCHES NOMINAL IN
distance_from_largest_bearing_surface_of_head_to_end_of_first_diameter0.880 INCHES NOMINAL IN
distance_from_largest_bearing_surface_of_head_to_end_of_third_diameter2.910 INCHES NOMINAL IN
NSN5306-00-678-1887
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 8724979 · 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
•
FOURTH DIAMETER FROM HEAD: 0.494 INCHES MINIMUM AND 0.498 INCHES MAXIMUM IN
•
FASTENER LENGTH: 4.250 INCHES NOMINAL IN
•
THREAD LENGTH: 0.500 INCHES MINIMUM IN
•
FIRST DIAMETER FROM HEAD: 0.860 INCHES NOMINAL IN
•
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER: 2.000 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.625 INCHES IN
•
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF THIRD DIAMETER: 2.910 INCHES NOMINAL IN
•
SECOND DIAMETER FROM HEAD: 0.860 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
FOURTH DIAMETER FROM HEAD0.494 INCHES MINIMUM AND 0.498 INCHES MAXIMUM IN
FASTENER LENGTH4.250 INCHES NOMINAL IN
THREAD LENGTH0.500 INCHES MINIMUM IN
FIRST DIAMETER FROM HEAD0.860 INCHES NOMINAL IN
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER2.000 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.625 INCHES IN
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF THIRD DIAMETER2.910 INCHES NOMINAL IN
SECOND DIAMETER FROM HEAD0.860 INCHES NOMINAL IN
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER0.880 INCHES NOMINAL IN
THREAD CLASS3A A
SUBSTITUTES & CROSS-REFERENCES 3
582464Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
CS-2300-0001Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
5306006781887Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 8724979?
8724979 is a BOLT,EXTERNALLY RELIEVED BODY.
What parts can replace 8724979?
There are 3 known substitutes for 8724979: 582464, CS-2300-0001, 5306006781887. Substitute compatibility should be verified for your specific system.
What is the NSN for 8724979?
8724979 is cataloged in the U.S. Government catalog under NSN 5306-00-678-1887. 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.