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8391678 — SCREW,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

8391678: SCREW,SHOULDER.

The SCREW,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: FLAT CHAMFER, head_height: 0.306 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.739 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN, thread_length: 0.531 INCHES MINIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-282-9731, 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
8391678
NSN: 5305-00-282-9731
FSC: 5305 — Screws
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleFLAT CHAMFER
head_height0.306 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.739 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
thread_length0.531 INCHES MINIMUM IN
shoulder_shapeROUND ALL SHOULDERS
fastener_length1.781 INCHES NOMINAL IN
hardness_rating28.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM OVERALL
shoulder_length0.492 INCHES MINIMUM AND 0.497 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.094 INCHES NOMINAL SECOND SHOULDER IN
NSN5305-00-282-9731
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 8391678 · 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: 0.306 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.781 INCHES NOMINAL IN
•
SHOULDER LENGTH: 0.298 INCHES NOMINAL SECOND SHOULDER IN
•
SHOULDER DIAMETER: 0.094 INCHES MINIMUM AND 1.062 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.531 INCHES MINIMUM IN
•
SHOULDER SHAPE: ROUND ALL SHOULDERS
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.306 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
FASTENER LENGTH1.781 INCHES NOMINAL IN
SHOULDER LENGTH0.298 INCHES NOMINAL SECOND SHOULDER IN
SHOULDER LENGTH0.492 INCHES MINIMUM AND 0.497 INCHES MAXIMUM FIRST SHOULDER IN
SHOULDER DIAMETER0.094 INCHES MINIMUM AND 1.062 INCHES MAXIMUM FIRST SHOULDER IN
SHOULDER DIAMETER0.094 INCHES NOMINAL SECOND SHOULDER IN
THREAD LENGTH0.531 INCHES MINIMUM IN
SHOULDER SHAPEROUND ALL SHOULDERS
HARDNESS RATING28.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-001-5016 5305-00-001-9160 5305-00-001-9629 5305-00-001-9742 5305-00-001-9768 5305-00-003-4306 5305-00-003-6694 5305-00-003-6753
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 8391678?
8391678 is a SCREW,SHOULDER.
What is the NSN for 8391678?
8391678 is cataloged in the U.S. Government catalog under NSN 5305-00-282-9731. 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.