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ST3M731-6-52 — BOLT,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

ST3M731-6-52: BOLT,MACHINE.

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: TITANIUM ALLOY OVERALL, head_style: HEXAGON, grip_length: 3.240 INCHES MINIMUM AND 3.260 INCHES MAXIMUM IN, head_height: 0.188 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.568 INCHES MINIMUM AND 0.588 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-261-6128, 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
ST3M731-6-52
NSN: 5306-01-261-6128
FSC: 5306 — Bolts
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialTITANIUM ALLOY OVERALL
head_styleHEXAGON
grip_length3.240 INCHES MINIMUM AND 3.260 INCHES MAXIMUM IN
head_height0.188 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
thread_class3A A
thread_length0.568 INCHES MINIMUM AND 0.588 INCHES MAXIMUM IN
fastener_length3.813 INCHES MINIMUM AND 3.843 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
surface_treatmentALUMINUM OVERALL
width_between_flats0.553 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN
nominal_thread_diameter0.375 INCHES IN
thread_quantity_per_inch24
NSN5306-01-261-6128
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: ST3M731-6-52 · 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: 0.188 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
•
FASTENER LENGTH: 3.813 INCHES MINIMUM AND 3.843 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.568 INCHES MINIMUM AND 0.588 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.375 INCHES IN
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
GRIP LENGTH: 3.240 INCHES MINIMUM AND 3.260 INCHES MAXIMUM IN
•
WIDTH BETWEEN FLATS: 0.553 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.188 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
FASTENER LENGTH3.813 INCHES MINIMUM AND 3.843 INCHES MAXIMUM IN
THREAD LENGTH0.568 INCHES MINIMUM AND 0.588 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.375 INCHES IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH3.240 INCHES MINIMUM AND 3.260 INCHES MAXIMUM IN
WIDTH BETWEEN FLATS0.553 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN
SURFACE TREATMENTALUMINUM OVERALL
THREAD CLASS3A A
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 3
SC2663-6-52Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
PBF1264-6-52Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
VS3207-6-52Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is ST3M731-6-52?
ST3M731-6-52 is a BOLT,MACHINE.
What parts can replace ST3M731-6-52?
There are 3 known substitutes for ST3M731-6-52: SC2663-6-52, PBF1264-6-52, VS3207-6-52. Substitute compatibility should be verified for your specific system.
What is the NSN for ST3M731-6-52?
ST3M731-6-52 is cataloged in the U.S. Government catalog under NSN 5306-01-261-6128. 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.