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12274571 — BOLT,RIBBED SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

12274571: BOLT,RIBBED SHOULDER.

The BOLT,RIBBED SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP 8637 OR STEEL COMP 8640 OVERALL, head_style: FLAT CHAMFER, rib_length: 1.040 INCHES MINIMUM AND 1.100 INCHES MAXIMUM IN, head_height: 0.310 INCHES NOMINAL IN, rib_quantity: 28, thread_class: 2A A. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-068-1303, 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
12274571
NSN: 5306-01-068-1303
FSC: 5306 — Bolts
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
materialSTEEL COMP 8637 OR STEEL COMP 8640 OVERALL
head_styleFLAT CHAMFER
rib_length1.040 INCHES MINIMUM AND 1.100 INCHES MAXIMUM IN
head_height0.310 INCHES NOMINAL IN
rib_quantity28
thread_class2A A
head_diameter1.310 INCHES NOMINAL IN
thread_length1.200 INCHES MINIMUM AND 1.300 INCHES MAXIMUM IN
shoulder_shapeRIBBED FIRST SHOULDER
fastener_length3.541 INCHES MINIMUM AND 3.601 INCHES MAXIMUM IN
hardness_rating40.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM OVERALL
shoulder_length1.160 INCHES NOMINAL FIRST SHOULDER IN
NSN5306-01-068-1303
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 12274571 · 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: 0.310 INCHES NOMINAL IN
•
FASTENER LENGTH: 3.541 INCHES MINIMUM AND 3.601 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 1.160 INCHES NOMINAL FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
DISTANCE FROM LARGEST DIAMETER OF BEARING SURFACE OF HEAD TO RIBS: 0.060 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN
•
SHOULDER DIAMETER: 0.995 INCHES MINIMUM AND 1.005 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 1.200 INCHES MINIMUM AND 1.300 INCHES MAXIMUM IN
•
SHOULDER SHAPE: RIBBED FIRST SHOULDER
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.310 INCHES NOMINAL IN
FASTENER LENGTH3.541 INCHES MINIMUM AND 3.601 INCHES MAXIMUM IN
SHOULDER LENGTH1.160 INCHES NOMINAL FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
DISTANCE FROM LARGEST DIAMETER OF BEARING SURFACE OF HEAD TO RIBS0.060 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN
SHOULDER DIAMETER0.995 INCHES MINIMUM AND 1.005 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH1.200 INCHES MINIMUM AND 1.300 INCHES MAXIMUM IN
SHOULDER SHAPERIBBED FIRST SHOULDER
HARDNESS RATING40.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A322 ASSN STD ALL MATERIAL RESPONSES OR ASTM A331 ASSN STD ALL MATERIAL RESPONSES 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 1
5306010681303Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 12274571?
12274571 is a BOLT,RIBBED SHOULDER.
What parts can replace 12274571?
There is 1 known substitute for 12274571: 5306010681303. Substitute compatibility should be verified for your specific system.
What is the NSN for 12274571?
12274571 is cataloged in the U.S. Government catalog under NSN 5306-01-068-1303. 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.