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6860840 — BOLT,EXTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

6860840: BOLT,EXTERNALLY RELIEVED BODY.

The BOLT,EXTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 OVERALL, head_style: DOUBLE HEXAGON EXTENDED WASHER, head_height: 0.300 INCHES NOMINAL IN, thread_class: 3A A, thread_length: 0.625 INCHES MINIMUM IN, fastener_length: 3.625 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-855-2012, 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
6860840
NSN: 5306-00-855-2012
FSC: 5306 — Bolts
CAGE: 73342 — ALLISON TRANSMISSION INC DBA ALLISON TRANSMISSION, INC (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
head_styleDOUBLE HEXAGON EXTENDED WASHER
head_height0.300 INCHES NOMINAL IN
thread_class3A A
thread_length0.625 INCHES MINIMUM IN
fastener_length3.625 INCHES NOMINAL IN
thread_directionRIGHT-HAND
width_between_flats0.305 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
nominal_thread_diameter0.250 INCHES IN
extended_washer_diameter0.438 INCHES NOMINAL IN
first_diameter_from_head0.244 INCHES MINIMUM AND 0.249 INCHES MAXIMUM IN
third_diameter_from_head0.2489 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN
NSN5306-00-855-2012
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 6860840 · 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: 0.190 INCHES MINIMUM AND 0.195 INCHES MAXIMUM IN
•
EXTENDED WASHER THICKNESS: 0.060 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.300 INCHES NOMINAL IN
•
FASTENER LENGTH: 3.625 INCHES NOMINAL IN
•
EXTENDED WASHER DIAMETER: 0.438 INCHES NOMINAL IN
•
THREAD LENGTH: 0.625 INCHES MINIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5731 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
FIRST DIAMETER FROM HEAD: 0.244 INCHES MINIMUM AND 0.249 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
FOURTH DIAMETER FROM HEAD0.190 INCHES MINIMUM AND 0.195 INCHES MAXIMUM IN
EXTENDED WASHER THICKNESS0.060 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN
HEAD HEIGHT0.300 INCHES NOMINAL IN
FASTENER LENGTH3.625 INCHES NOMINAL IN
EXTENDED WASHER DIAMETER0.438 INCHES NOMINAL IN
THREAD LENGTH0.625 INCHES MINIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5731 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
FIRST DIAMETER FROM HEAD0.244 INCHES MINIMUM AND 0.249 INCHES MAXIMUM IN
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER1.400 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.250 INCHES 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

No substitute or cross-reference records for this part.

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 6860840?
6860840 is a BOLT,EXTERNALLY RELIEVED BODY.
What is the NSN for 6860840?
6860840 is cataloged in the U.S. Government catalog under NSN 5306-00-855-2012. 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.