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006643028-121 — BOLT,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

006643028-121: BOLT,MACHINE.

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include head_style: HEXAGON, head_height: 0.591 INCHES MINIMUM AND 0.700 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 2.260 INCHES NOMINAL IN, fastener_length: 2.260 INCHES NOMINAL IN, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-556-3079, 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
006643028-121
NSN: 5306-01-556-3079
FSC: 5306 — Bolts
CAGE: 17454 — TIMKEN GEARS & SERVICES INC. DIV PHILADELPHIA GEAR (USA)
SPECIFICATIONS
head_styleHEXAGON
head_height0.591 INCHES MINIMUM AND 0.700 INCHES MAXIMUM IN
thread_class2A A
thread_length2.260 INCHES NOMINAL IN
fastener_length2.260 INCHES NOMINAL IN
thread_directionRIGHT-HAND
width_between_flats1.575 INCHES MINIMUM AND 1.625 INCHES MAXIMUM IN
nominal_thread_diameter1.000 INCHES IN
thread_quantity_per_inch8
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5306-01-556-3079
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 006643028-121 · 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: 0.591 INCHES MINIMUM AND 0.700 INCHES MAXIMUM IN
•
FASTENER LENGTH: 2.260 INCHES NOMINAL IN
•
THREAD LENGTH: 2.260 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 1.000 INCHES IN
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH BETWEEN FLATS: 1.575 INCHES MINIMUM AND 1.625 INCHES MAXIMUM IN
•
THREAD CLASS: 2A A
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.591 INCHES MINIMUM AND 0.700 INCHES MAXIMUM IN
FASTENER LENGTH2.260 INCHES NOMINAL IN
THREAD LENGTH2.260 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER1.000 INCHES IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS1.575 INCHES MINIMUM AND 1.625 INCHES MAXIMUM IN
THREAD CLASS2A A
THREAD QUANTITY PER INCH8
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
SUBSTITUTES & CROSS-REFERENCES 2
6643028-121Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
038G4122G-1 ITEM 47Same 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 006643028-121?
006643028-121 is a BOLT,MACHINE.
What parts can replace 006643028-121?
There are 2 known substitutes for 006643028-121: 6643028-121, 038G4122G-1 ITEM 47. Substitute compatibility should be verified for your specific system.
What is the NSN for 006643028-121?
006643028-121 is cataloged in the U.S. Government catalog under NSN 5306-01-556-3079. 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.