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728B1 — BOLT,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

728B1: BOLT,MACHINE.

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 8635 OVERALL, head_style: HEXAGON EXTENDED WASHER, head_height: 0.396 INCHES MINIMUM AND 0.416 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 0.927 INCHES MINIMUM AND 0.947 INCHES MAXIMUM IN, fastener_length: 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-737-2758, 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
728B1
NSN: 5306-00-737-2758
NIINs: 007372758, 008443971
FSC: 5306 — Bolts
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
materialSTEEL COMP 8635 OVERALL
head_styleHEXAGON EXTENDED WASHER
head_height0.396 INCHES MINIMUM AND 0.416 INCHES MAXIMUM IN
thread_class2A A
thread_length0.927 INCHES MINIMUM AND 0.947 INCHES MAXIMUM IN
fastener_length0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
hardness_rating30.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
features_providedFINISHED HEAD
surface_treatmentCADMIUM OR ZINC OVERALL
width_between_flats0.5525 INCHES MINIMUM AND 0.5625 INCHES MAXIMUM IN
nominal_thread_diameter0.375 INCHES IN
NSN5306-00-737-2758
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 728B1 · 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
•
EXTENDED WASHER THICKNESS: 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.396 INCHES MINIMUM AND 0.416 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
•
EXTENDED WASHER DIAMETER: 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.927 INCHES MINIMUM AND 0.947 INCHES MAXIMUM IN
•
HARDNESS RATING: 30.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.375 INCHES IN
TECHNICAL CHARACTERISTICS
EXTENDED WASHER THICKNESS0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
HEAD HEIGHT0.396 INCHES MINIMUM AND 0.416 INCHES MAXIMUM IN
FASTENER LENGTH0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
EXTENDED WASHER DIAMETER0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
THREAD LENGTH0.927 INCHES MINIMUM AND 0.947 INCHES MAXIMUM IN
HARDNESS RATING30.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.375 INCHES IN
FEATURES PROVIDEDFINISHED HEAD
HEAD STYLEHEXAGON EXTENDED WASHER
SUBSTITUTES & CROSS-REFERENCES 1
913243Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 728B1?
728B1 is a BOLT,MACHINE.
What parts can replace 728B1?
There is 1 known substitute for 728B1: 913243. Substitute compatibility should be verified for your specific system.
What is the NSN for 728B1?
728B1 is cataloged in the U.S. Government catalog under NSN 5306-00-737-2758. 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.