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ASME B18.3.2.1M — SCREW,CAP,HEXAGON HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

ASME B18.3.2.1M: SCREW,CAP,HEXAGON HEAD.

The SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 9.7 MILLIMETERS NOMINAL MM, head_diameter: 8.28 MILLIMETERS MINIMUM AND 8.72 MILLIMETERS MAXIMUM MM, thread_length: 10.0 MILLIMETERS NOMINAL MM, fastener_length: 25.0 MILLIMETERS NOMINAL MM. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-686-9531, 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
ASME B18.3.2.1M
NSN: 5305-01-686-9531
NIINs: 016869531, 016869544
FSC: 5305 — Screws
CAGE: 05047 — THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height9.7 MILLIMETERS NOMINAL MM
head_diameter8.28 MILLIMETERS MINIMUM AND 8.72 MILLIMETERS MAXIMUM MM
thread_length10.0 MILLIMETERS NOMINAL MM
fastener_length25.0 MILLIMETERS NOMINAL MM
thread_directionRIGHT-HAND
surface_treatmentZINC OVERALL
width_across_flats5.0 MILLIMETERS MINIMUM AND 5.1 MILLIMETERS MAXIMUM MM
width_between_flats27.6 MILLIMETERS NOMINAL MM
internal_drive_styleHEXAGON
nominal_thread_diameter16.0 MILLIMETERS MM
NSN5305-01-686-9531
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: ASME B18.3.2.1M · 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: 9.7 MILLIMETERS NOMINAL MM
•
FASTENER LENGTH: 25.0 MILLIMETERS NOMINAL MM
•
THREAD PITCH IN MILLIMETERS: 2.5
•
THREAD LENGTH: 25.0 MILLIMETERS NOMINAL MM
•
NOMINAL THREAD DIAMETER: 16.0 MILLIMETERS MM
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH BETWEEN FLATS: 27.6 MILLIMETERS NOMINAL MM
TECHNICAL CHARACTERISTICS
HEAD HEIGHT9.7 MILLIMETERS NOMINAL MM
FASTENER LENGTH25.0 MILLIMETERS NOMINAL MM
THREAD PITCH IN MILLIMETERS2.5
THREAD LENGTH25.0 MILLIMETERS NOMINAL MM
NOMINAL THREAD DIAMETER16.0 MILLIMETERS MM
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS27.6 MILLIMETERS NOMINAL MM
COLORNATURAL OVERALL
SURFACE TREATMENTZINC OVERALL
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 ASME B18.3.2.1M?
ASME B18.3.2.1M is a SCREW,CAP,HEXAGON HEAD.
What is the NSN for ASME B18.3.2.1M?
ASME B18.3.2.1M is cataloged in the U.S. Government catalog under NSN 5305-01-686-9531. 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.