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ST3M497-4D21 — BOLT,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

ST3M497-4D21: BOLT,SHOULDER.

The BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: DOUBLE HEXAGON, head_height: 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.371 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN, shoulder_shape: ROUND FIRST SHOULDER. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-044-8501, 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
ST3M497-4D21
NSN: 5306-01-044-8501
FSC: 5306 — Bolts
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleDOUBLE HEXAGON
head_height0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN
thread_class3A A
thread_length0.371 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length1.693 INCHES MINIMUM AND 1.740 INCHES MAXIMUM IN
shoulder_length1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.264 INCHES MINIMUM AND 0.265 INCHES MAXIMUM FIRST SHOULDER IN
width_between_flats0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
nominal_thread_diameter0.250 INCHES IN
NSN5306-01-044-8501
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: ST3M497-4D21 · 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: 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.693 INCHES MINIMUM AND 1.740 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM FIRST SHOULDER IN
•
SHOULDER DIAMETER: 0.264 INCHES MINIMUM AND 0.265 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.371 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
SHANK UNTHREADED HOLE DIAMETER: 0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM FIRST HOLE IN
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN
FASTENER LENGTH1.693 INCHES MINIMUM AND 1.740 INCHES MAXIMUM IN
SHOULDER LENGTH1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM FIRST SHOULDER IN
SHOULDER DIAMETER0.264 INCHES MINIMUM AND 0.265 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.371 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
SHANK UNTHREADED HOLE DIAMETER0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM FIRST HOLE IN
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEDOUBLE HEXAGON
THREAD DIRECTIONRIGHT-HAND
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 7
S11-1061-4D21Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
BM17019-4D21XReference document
Same NSN cross-reference
Reference document — Secondary reference
109453-4D21XReference document
Same NSN cross-reference
Reference document — Secondary reference
VS3037-4D21Reference document
Same NSN cross-reference
Reference document — Secondary reference
109450-4D21Reference document
Same NSN cross-reference
Reference document — Secondary reference
VAL23607-4D21Reference 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 ST3M497-4D21?
ST3M497-4D21 is a BOLT,SHOULDER.
What parts can replace ST3M497-4D21?
There are 7 known substitutes for ST3M497-4D21: S11-1061-4D21, BM17019-4D21X, 109453-4D21X and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ST3M497-4D21?
ST3M497-4D21 is cataloged in the U.S. Government catalog under NSN 5306-01-044-8501. 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.