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ST3M729-10D40 — BOLT,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

ST3M729-10D40: BOLT,CLOSE TOLERANCE.

The BOLT,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: DOUBLE HEXAGON, grip_length: 2.490 INCHES MINIMUM AND 2.510 INCHES MAXIMUM IN, head_height: 0.340 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.6235 INCHES MINIMUM AND 0.6240 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-027-6400, 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
ST3M729-10D40
NSN: 5306-01-027-6400
FSC: 5306 — Bolts
CAGE: 17446 — HUCK INTERNATIONAL, INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleDOUBLE HEXAGON
grip_length2.490 INCHES MINIMUM AND 2.510 INCHES MAXIMUM IN
head_height0.340 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.6235 INCHES MINIMUM AND 0.6240 INCHES MAXIMUM IN
thread_length0.517 INCHES MINIMUM AND 0.584 INCHES MAXIMUM IN
fastener_length3.027 INCHES MINIMUM AND 3.074 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
width_between_flats0.928 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN
nominal_thread_diameter0.625 INCHES IN
minimum_tensile_strength125000 POUNDS PER SQUARE INCH LBS
NSN5306-01-027-6400
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: ST3M729-10D40 · 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: 0.340 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN
•
FASTENER LENGTH: 3.027 INCHES MINIMUM AND 3.074 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.517 INCHES MINIMUM AND 0.584 INCHES MAXIMUM IN
•
SHANK UNTHREADED HOLE DIAMETER: 0.141 INCHES MINIMUM AND 0.146 INCHES MAXIMUM FIRST HOLE IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: 23-112,MCDONNEL DOUGLAS CORP MFR REF SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.625 INCHES IN
•
HEAD STYLE: DOUBLE HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.340 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN
FASTENER LENGTH3.027 INCHES MINIMUM AND 3.074 INCHES MAXIMUM IN
THREAD LENGTH0.517 INCHES MINIMUM AND 0.584 INCHES MAXIMUM IN
SHANK UNTHREADED HOLE DIAMETER0.141 INCHES MINIMUM AND 0.146 INCHES MAXIMUM FIRST HOLE IN
MATERIAL DOCUMENT AND CLASSIFICATION23-112,MCDONNEL DOUGLAS CORP MFR REF SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.625 INCHES IN
HEAD STYLEDOUBLE HEXAGON
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH2.490 INCHES MINIMUM AND 2.510 INCHES MAXIMUM IN
WIDTH BETWEEN FLATS0.928 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN
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 1
MB145-10D40Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 ST3M729-10D40?
ST3M729-10D40 is a BOLT,CLOSE TOLERANCE.
What parts can replace ST3M729-10D40?
There is 1 known substitute for ST3M729-10D40: MB145-10D40. Substitute compatibility should be verified for your specific system.
What is the NSN for ST3M729-10D40?
ST3M729-10D40 is cataloged in the U.S. Government catalog under NSN 5306-01-027-6400. 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.