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9M5181 — BOLT,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

9M5181: BOLT,CLOSE TOLERANCE.

The BOLT,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, grip_length: 0.803 INCHES NOMINAL IN, head_height: 0.219 INCHES NOMINAL IN, thread_class: 2A A, grip_diameter: 0.3125 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-834-8450, 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
9M5181
NSN: 5306-00-834-8450
FSC: 5306 — Bolts
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
grip_length0.803 INCHES NOMINAL IN
head_height0.219 INCHES NOMINAL IN
thread_class2A A
grip_diameter0.3125 INCHES NOMINAL IN
thread_length0.603 INCHES MINIMUM IN
fastener_length1.406 INCHES NOMINAL IN
thread_directionRIGHT-HAND
width_between_flats0.500 INCHES NOMINAL IN
nominal_thread_diameter0.312 INCHES IN
thread_quantity_per_inch18
NSN5306-00-834-8450
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 9M5181 · 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: 0.219 INCHES NOMINAL IN
•
FASTENER LENGTH: 1.406 INCHES NOMINAL IN
•
THREAD LENGTH: 0.603 INCHES MINIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: BW278M GRADE B FSCM 06853 MFR REF SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.312 INCHES IN
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
GRIP LENGTH: 0.803 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.219 INCHES NOMINAL IN
FASTENER LENGTH1.406 INCHES NOMINAL IN
THREAD LENGTH0.603 INCHES MINIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONBW278M GRADE B FSCM 06853 MFR REF SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.312 INCHES IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH0.803 INCHES NOMINAL IN
WIDTH BETWEEN FLATS0.500 INCHES NOMINAL IN
GRIP DIAMETER0.3125 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 1
47977Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 9M5181?
9M5181 is a BOLT,CLOSE TOLERANCE.
What parts can replace 9M5181?
There is 1 known substitute for 9M5181: 47977. Substitute compatibility should be verified for your specific system.
What is the NSN for 9M5181?
9M5181 is cataloged in the U.S. Government catalog under NSN 5306-00-834-8450. 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.