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Technical Data Sheet
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A104-3B — BOLT,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

A104-3B: BOLT,MACHINE.

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, head_style: HEXAGON, grip_length: 0.363 INCHES MINIMUM AND 0.393 INCHES MAXIMUM IN, head_height: 0.075 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 0.307 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-452-4972, 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
A104-3B
NSN: 5306-00-452-4972
FSC: 5306 — Bolts
CAGE: K8837 — BAS COMPONENTS LIMITED (GBR)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
head_styleHEXAGON
grip_length0.363 INCHES MINIMUM AND 0.393 INCHES MAXIMUM IN
head_height0.075 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN
thread_class2A A
thread_length0.307 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN
fastener_length0.700 INCHES MINIMUM AND 0.740 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
width_between_flats0.245 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
nominal_thread_diameter0.138 INCHES IN
thread_quantity_per_inch32
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5306-00-452-4972
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: A104-3B · 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: 0.075 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.700 INCHES MINIMUM AND 0.740 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.307 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: S.80 FSCM K7766 NATIONAL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.138 INCHES IN
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
GRIP LENGTH: 0.363 INCHES MINIMUM AND 0.393 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.075 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN
FASTENER LENGTH0.700 INCHES MINIMUM AND 0.740 INCHES MAXIMUM IN
THREAD LENGTH0.307 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONS.80 FSCM K7766 NATIONAL SPEC SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.138 INCHES IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH0.363 INCHES MINIMUM AND 0.393 INCHES MAXIMUM IN
WIDTH BETWEEN FLATS0.245 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
THREAD CLASS2A A
SUBSTITUTES & CROSS-REFERENCES 3
79801256005Reference document
Same NSN cross-reference
Reference document — Secondary reference
99-9434448Reference document
Same NSN cross-reference
Reference document — Informative reference only
3A104-3BReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
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 A104-3B?
A104-3B is a BOLT,MACHINE.
What parts can replace A104-3B?
There are 3 known substitutes for A104-3B: 79801256005, 99-9434448, 3A104-3B. Substitute compatibility should be verified for your specific system.
What is the NSN for A104-3B?
A104-3B is cataloged in the U.S. Government catalog under NSN 5306-00-452-4972. 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.