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6658757-1 — BOLT,INTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

6658757-1: BOLT,INTERNALLY RELIEVED BODY.

The BOLT,INTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4340 OVERALL, head_style: HEXAGON, head_height: 0.375 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.617 INCHES MINIMUM AND 0.633 INCHES MAXIMUM IN, thread_series: UNIFIED NATIONAL COARSE (UNC) CONCENTRIC HOLE. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-369-0769, 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
6658757-1
NSN: 5306-01-369-0769
FSC: 5306 — Bolts
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialSTEEL COMP 4340 OVERALL
head_styleHEXAGON
head_height0.375 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN
thread_class3A A
thread_length0.617 INCHES MINIMUM AND 0.633 INCHES MAXIMUM IN
thread_seriesUNIFIED NATIONAL COARSE (UNC) CONCENTRIC HOLE
fastener_length0.814 INCHES MINIMUM AND 0.820 INCHES MAXIMUM IN
hardness_rating320.0 BRINELL STANDARD MINIMUM AND 360.0 BRINELL STANDARD MAXIMUM OVERALL
style_designatorCONCENTRIC HOLE THREADED
thread_directionRIGHT-HAND
threads_per_inch18 CONCENTRIC HOLE
surface_treatmentPHOSPHATE ZINC OR PHOSPHATE MANGANESE OVERALL
NSN5306-01-369-0769
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 6658757-1 · 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: 0.375 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.814 INCHES MINIMUM AND 0.820 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: TT-C-490 TY 1 ASSN STD 1ST TREATMENT RESPONSE OR DOD-P-132 TY M CL 1 FED SPEC 2ND TREATMENT RESPONSE OVERALL
•
INTERNAL THREAD LENGTH: 1.192 INCHES NOMINAL CONCENTRIC HOLE IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC) CONCENTRIC HOLE
•
INTERNAL THREAD DIRECTION: RIGHT-HAND CONCENTRIC HOLE
•
THREAD LENGTH: 0.617 INCHES MINIMUM AND 0.633 INCHES MAXIMUM IN
•
HARDNESS RATING: 320.0 BRINELL STANDARD MINIMUM AND 360.0 BRINELL STANDARD MAXIMUM OVERALL
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.375 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN
FASTENER LENGTH0.814 INCHES MINIMUM AND 0.820 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONTT-C-490 TY 1 ASSN STD 1ST TREATMENT RESPONSE OR DOD-P-132 TY M CL 1 FED SPEC 2ND TREATMENT RESPONSE OVERALL
INTERNAL THREAD LENGTH1.192 INCHES NOMINAL CONCENTRIC HOLE IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC) CONCENTRIC HOLE
INTERNAL THREAD DIRECTIONRIGHT-HAND CONCENTRIC HOLE
THREAD LENGTH0.617 INCHES MINIMUM AND 0.633 INCHES MAXIMUM IN
HARDNESS RATING320.0 BRINELL STANDARD MINIMUM AND 360.0 BRINELL STANDARD MAXIMUM OVERALL
THREADS PER INCH18 CONCENTRIC HOLE
STYLE DESIGNATORCONCENTRIC HOLE THREADED
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

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 6658757-1?
6658757-1 is a BOLT,INTERNALLY RELIEVED BODY.
What is the NSN for 6658757-1?
6658757-1 is cataloged in the U.S. Government catalog under NSN 5306-01-369-0769. 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.