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Technical Data Sheet
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12008318 — BOLT,RIBBED SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

12008318: BOLT,RIBBED SHOULDER.

The BOLT,RIBBED SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, rib_length: 0.540 INCHES NOMINAL IN, head_height: 0.380 INCHES NOMINAL IN, thread_class: 2A A, head_diameter: 2.000 INCHES NOMINAL IN, thread_length: 1.300 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-039-6637, 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
12008318
NSN: 5306-01-039-6637
FSC: 5306 — Bolts
CAGE: 19200 — COMBAT CAPABILITIES DEVELOPMENT COMMAND (CCDC) ARMAMENTS CENTER DBA CCDC DIV LOGISTICS RESEARCH AND ENGINEERING DIRECTORATE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
rib_length0.540 INCHES NOMINAL IN
head_height0.380 INCHES NOMINAL IN
thread_class2A A
head_diameter2.000 INCHES NOMINAL IN
thread_length1.300 INCHES NOMINAL IN
shoulder_shapeRIBBED FIRST SHOULDER
fastener_length2.820 INCHES NOMINAL IN
hardness_rating35.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL
shoulder_length0.760 INCHES NOMINAL FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.960 INCHES MINIMUM AND 0.970 INCHES MAXIMUM FIRST SHOULDER IN
NSN5306-01-039-6637
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 12008318 · 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: 0.380 INCHES NOMINAL IN
•
RIB INCLUDED ANGLE: 45.0 DEGREES NOMINAL
•
FASTENER LENGTH: 2.820 INCHES NOMINAL IN
•
SHOULDER LENGTH: 0.760 INCHES NOMINAL FIRST SHOULDER IN
•
DISTANCE FROM CENTERLINE TO FLAT: 0.750 INCHES NOMINAL IN
•
DISTANCE FROM LARGEST DIAMETER OF BEARING SURFACE OF HEAD TO RIBS: 0.120 INCHES NOMINAL IN
•
SHOULDER DIAMETER: 0.960 INCHES MINIMUM AND 0.970 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 1.300 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.380 INCHES NOMINAL IN
RIB INCLUDED ANGLE45.0 DEGREES NOMINAL
FASTENER LENGTH2.820 INCHES NOMINAL IN
SHOULDER LENGTH0.760 INCHES NOMINAL FIRST SHOULDER IN
DISTANCE FROM CENTERLINE TO FLAT0.750 INCHES NOMINAL IN
DISTANCE FROM LARGEST DIAMETER OF BEARING SURFACE OF HEAD TO RIBS0.120 INCHES NOMINAL IN
SHOULDER DIAMETER0.960 INCHES MINIMUM AND 0.970 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH1.300 INCHES NOMINAL IN
SHOULDER SHAPERIBBED FIRST SHOULDER
HARDNESS RATING35.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM 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 12008318?
12008318 is a BOLT,RIBBED SHOULDER.
What is the NSN for 12008318?
12008318 is cataloged in the U.S. Government catalog under NSN 5306-01-039-6637. 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.