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6874821 — BOLT,INTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

6874821: BOLT,INTERNALLY RELIEVED BODY.

The BOLT,INTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include head_style: DISHED HEXAGON, head_height: 0.307 INCHES MINIMUM AND 0.317 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.457 INCHES NOMINAL IN, thread_series: UNJC COUNTERBORE, fastener_length: 0.803 INCHES MINIMUM AND 0.821 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-369-4802, 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
6874821
NSN: 5306-01-369-4802
FSC: 5306 — Bolts
CAGE: 63005 — ROLLS-ROYCE CORPORATION (USA)
SPECIFICATIONS
head_styleDISHED HEXAGON
head_height0.307 INCHES MINIMUM AND 0.317 INCHES MAXIMUM IN
thread_class3A A
thread_length0.457 INCHES NOMINAL IN
thread_seriesUNJC COUNTERBORE
fastener_length0.803 INCHES MINIMUM AND 0.821 INCHES MAXIMUM IN
special_featuresUNDEUNDERCUT UNDER COUNTERBORE DIA. 0.098 MIN. AND UNDER CUT UNDER COUNTERBORE DIA. 0.098 MIN. AND 0.102 MAX LENGTH 0.047 MAX AND 0.012 MAX RADIUS.
style_designatorCOUNTERBORE THREADED
thread_directionRIGHT-HAND
threads_per_inch32 COUNTERBORE
nominal_thread_size0.138 INCHES COUNTERBORE IN
width_between_flats0.246 INCHES MINIMUM AND 0.254 INCHES MAXIMUM IN
NSN5306-01-369-4802
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 6874821 · 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: 0.307 INCHES MINIMUM AND 0.317 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.803 INCHES MINIMUM AND 0.821 INCHES MAXIMUM IN
•
INTERNAL THREAD LENGTH: 0.138 INCHES MINIMUM AND 0.158 INCHES MAXIMUM COUNTERBORE IN
•
THREAD SERIES: UNJC COUNTERBORE
•
CONCENTRIC HOLE DEPTH: 0.150 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
•
INTERNAL THREAD DIRECTION: RIGHT-HAND COUNTERBORE
•
THREAD LENGTH: 0.457 INCHES NOMINAL IN
•
THREADS PER INCH: 32 COUNTERBORE
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.307 INCHES MINIMUM AND 0.317 INCHES MAXIMUM IN
FASTENER LENGTH0.803 INCHES MINIMUM AND 0.821 INCHES MAXIMUM IN
INTERNAL THREAD LENGTH0.138 INCHES MINIMUM AND 0.158 INCHES MAXIMUM COUNTERBORE IN
THREAD SERIESUNJC COUNTERBORE
CONCENTRIC HOLE DEPTH0.150 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
INTERNAL THREAD DIRECTIONRIGHT-HAND COUNTERBORE
THREAD LENGTH0.457 INCHES NOMINAL IN
THREADS PER INCH32 COUNTERBORE
STYLE DESIGNATORCOUNTERBORE THREADED
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5636 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
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 6874821?
6874821 is a BOLT,INTERNALLY RELIEVED BODY.
What is the NSN for 6874821?
6874821 is cataloged in the U.S. Government catalog under NSN 5306-01-369-4802. 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.