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12277353 — BOLT,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

12277353: BOLT,MACHINE.

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGONHEXAGON, head_height: 0.453 INCHES MINIMUM AND 0.453 INCHES MINIMUM AND 0.481 INCHES MAXIMUM0.481 INCHES MAXIMUM IN, thread_length: 0.750 INCHES NOMINAL0.750 INCHES NOMINAL IN, fastener_length: 5.250 INCHES MINIMUM AND 5.250 INCHES MINIMUM AND 5.340 INCHES MAXIMUM5.340 INCHES MAXIMUM IN, hardness_rating: 25.0 ROCKWELL C MINIMUM AND 25.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL40.0 ROCKWELL C MAXIMUM OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-134-6540, 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
12277353
NSN: 5306-01-134-6540
FSC: 5306 — Bolts
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGONHEXAGON
head_height0.453 INCHES MINIMUM AND 0.453 INCHES MINIMUM AND 0.481 INCHES MAXIMUM0.481 INCHES MAXIMUM IN
thread_length0.750 INCHES NOMINAL0.750 INCHES NOMINAL IN
fastener_length5.250 INCHES MINIMUM AND 5.250 INCHES MINIMUM AND 5.340 INCHES MAXIMUM5.340 INCHES MAXIMUM IN
hardness_rating25.0 ROCKWELL C MINIMUM AND 25.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL40.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HANDRIGHT-HAND
width_between_flats1.254 INCHES MINIMUM AND 1.254 INCHES MINIMUM AND 1.299 INCHES MAXIMUM1.299 INCHES MAXIMUM IN
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)UNIFIED NATIONAL COARSE (UNC)
NSN5306-01-134-6540
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 12277353 · 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: 0.453 INCHES MINIMUM AND 0.453 INCHES MINIMUM AND 0.481 INCHES MAXIMUM0.481 INCHES MAXIMUM IN
•
FASTENER LENGTH: 5.250 INCHES MINIMUM AND 5.250 INCHES MINIMUM AND 5.340 INCHES MAXIMUM5.340 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.750 INCHES NOMINAL0.750 INCHES NOMINAL IN
•
HARDNESS RATING: 25.0 ROCKWELL C MINIMUM AND 25.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL40.0 ROCKWELL C MAXIMUM OVERALL
•
HEAD STYLE: HEXAGONHEXAGON
•
THREAD DIRECTION: RIGHT-HANDRIGHT-HAND
•
WIDTH BETWEEN FLATS: 1.254 INCHES MINIMUM AND 1.254 INCHES MINIMUM AND 1.299 INCHES MAXIMUM1.299 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.453 INCHES MINIMUM AND 0.453 INCHES MINIMUM AND 0.481 INCHES MAXIMUM0.481 INCHES MAXIMUM IN
FASTENER LENGTH5.250 INCHES MINIMUM AND 5.250 INCHES MINIMUM AND 5.340 INCHES MAXIMUM5.340 INCHES MAXIMUM IN
THREAD LENGTH0.750 INCHES NOMINAL0.750 INCHES NOMINAL IN
HARDNESS RATING25.0 ROCKWELL C MINIMUM AND 25.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL40.0 ROCKWELL C MAXIMUM OVERALL
HEAD STYLEHEXAGONHEXAGON
THREAD DIRECTIONRIGHT-HANDRIGHT-HAND
WIDTH BETWEEN FLATS1.254 INCHES MINIMUM AND 1.254 INCHES MINIMUM AND 1.299 INCHES MAXIMUM1.299 INCHES MAXIMUM IN
SPECIAL FEATURESMACHINED AND ROUNDED 0.62 IN. IN LENGTH FROM THREADED SHANK END WITH 0.125 IN. HOLE DRILLED 0.50 IN. FROM ENDMACHINED AND ROUNDED 0.62 IN. IN LENGTH FROM THREADED SHANK END WITH 0.125 IN. HOLE DRILLED 0.50 IN. FROM END IN
MATERIALSTEEL OVERALL
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)UNIFIED NATIONAL COARSE (UNC)
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 12277353?
12277353 is a BOLT,MACHINE.
What is the NSN for 12277353?
12277353 is cataloged in the U.S. Government catalog under NSN 5306-01-134-6540. 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.