PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 6661687-1
6661687-1 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The SCREW,CAP,SOCKET HEAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: FLAT CHAMFER, head_height: 0.152 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.431 INCHES MINIMUM AND 0.437 INCHES MAXIMUM IN, thread_length: 0.889 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-369-4804, 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
6661687-1
NSN: 5305-01-369-4804
FSC: 5305
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleFLAT CHAMFER
head_height0.152 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.431 INCHES MINIMUM AND 0.437 INCHES MAXIMUM IN
thread_length0.889 INCHES NOMINAL IN
fastener_length0.969 INCHES MINIMUM AND 1.031 INCHES MAXIMUM IN
locking_featurePATCH OR PELLET OR STRIP THREADS
thread_directionRIGHT-HAND
surface_treatmentZINC AND CHROMATE OR ALUMINUM AND CHROMATE OVERALL
width_across_flats0.1562 INCHES MINIMUM AND 0.1587 INCHES MAXIMUM IN
internal_drive_styleHEXAGON
NSN5305-01-369-4804
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 6661687-1 · 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: 0.152 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.889 INCHES NOMINAL IN
•
HEAD DIAMETER: 0.431 INCHES MINIMUM AND 0.437 INCHES MAXIMUM IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
NOMINAL THREAD DIAMETER: 0.3125 INCHES IN
•
WIDTH ACROSS FLATS: 0.1562 INCHES MINIMUM AND 0.1587 INCHES MAXIMUM IN
•
MATERIAL: STEEL OVERALL
•
INTERNAL DRIVE STYLE: HEXAGON
TECHNICAL CHARACTERISTICS (FLIS)
HEAD HEIGHT0.152 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN
THREAD LENGTH0.889 INCHES NOMINAL IN
HEAD DIAMETER0.431 INCHES MINIMUM AND 0.437 INCHES MAXIMUM IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
NOMINAL THREAD DIAMETER0.3125 INCHES IN
WIDTH ACROSS FLATS0.1562 INCHES MINIMUM AND 0.1587 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
INTERNAL DRIVE STYLEHEXAGON
THREAD QUANTITY PER INCH18
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-87115,CLASS 1 MIL SPEC 1ST TREATMENT RESPONSE OR MIL-C-83488,CLASS 3 MIL SPEC 2ND TREATMENT RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
67296Interchangeable
interchangeable cross-reference
interchangeable
68036Interchangeable
interchangeable cross-reference
interchangeable
T1127Interchangeable
interchangeable cross-reference
interchangeable
48834Interchangeable
interchangeable cross-reference
interchangeable
KIMGUARDInterchangeable
interchangeable cross-reference
interchangeable
69393Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
Ready to buy 6661687-1?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 6661687-1?
6661687-1 is a SCREW,CAP,SOCKET HEAD.
What parts can replace 6661687-1?
There are 7 known substitutes for 6661687-1: 67296, 68036, T1127 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 6661687-1?
6661687-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-369-4804. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 6661687-1

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026