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A51B24668-21 — BOLT,INTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

A51B24668-21: BOLT,INTERNALLY RELIEVED BODY.

The BOLT,INTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include head_style: DEE CHAMFER, head_height: 0.145 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 1.710 INCHES NOMINAL IN, thread_length: 0.297 INCHES NOMINAL IN, fastener_length: 3.928 INCHES MINIMUM AND 3.933 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-386-8147, 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
A51B24668-21
NSN: 5306-01-386-8147
FSC: 5306 — Bolts
CAGE: 06892 — NORTHROP GRUMMAN SYSTEMS CORPORATION DBA NORTHROP GRUMMAN SYSTEMS CORP (USA)
SPECIFICATIONS
head_styleDEE CHAMFER
head_height0.145 INCHES NOMINAL IN
thread_class3A A
head_diameter1.710 INCHES NOMINAL IN
thread_length0.297 INCHES NOMINAL IN
fastener_length3.928 INCHES MINIMUM AND 3.933 INCHES MAXIMUM IN
hardness_rating46.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM OVERALL
shoulder_length3.318 INCHES MINIMUM AND 3.323 INCHES MAXIMUM IN
style_designatorCONCENTRIC HOLE UNTHREADED
thread_directionRIGHT-HAND
shoulder_diameter1.1468 INCHES MINIMUM AND 1.1473 INCHES MAXIMUM IN
surface_treatmentCADMIUM OVERALL
NSN5306-01-386-8147
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: A51B24668-21 · 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: 0.145 INCHES NOMINAL IN
•
FASTENER LENGTH: 3.928 INCHES MINIMUM AND 3.933 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: GSS9056, CAGE 26512 MFR REF SINGLE TREATMENT RESPONSE OVERALL
•
DISTANCE FROM CENTERLINE TO FLAT: 0.569 INCHES NOMINAL IN
•
CONCENTRIC HOLE DEPTH: 2.878 INCHES MINIMUM AND 2.883 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.297 INCHES NOMINAL IN
•
HARDNESS RATING: 46.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM OVERALL
•
STYLE DESIGNATOR: CONCENTRIC HOLE UNTHREADED
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.145 INCHES NOMINAL IN
FASTENER LENGTH3.928 INCHES MINIMUM AND 3.933 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONGSS9056, CAGE 26512 MFR REF SINGLE TREATMENT RESPONSE OVERALL
DISTANCE FROM CENTERLINE TO FLAT0.569 INCHES NOMINAL IN
CONCENTRIC HOLE DEPTH2.878 INCHES MINIMUM AND 2.883 INCHES MAXIMUM IN
THREAD LENGTH0.297 INCHES NOMINAL IN
HARDNESS RATING46.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM OVERALL
STYLE DESIGNATORCONCENTRIC HOLE UNTHREADED
MATERIAL DOCUMENT AND CLASSIFICATIONG-1010, CAGE 26512 MFR REF SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.375 INCHES IN
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 A51B24668-21?
A51B24668-21 is a BOLT,INTERNALLY RELIEVED BODY.
What is the NSN for A51B24668-21?
A51B24668-21 is cataloged in the U.S. Government catalog under NSN 5306-01-386-8147. 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.