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133599-4 — BOLT,EXTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

133599-4: BOLT,EXTERNALLY RELIEVED BODY.

The BOLT,EXTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: CROWNED HEXAGON, thread_class: 2A A, thread_length: 0.370 INCHES MAXIMUM IN, fastener_length: 1.250 INCHES NOMINAL IN, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-156-6396, 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
133599-4
NSN: 5306-01-156-6396
FSC: 5306 — Bolts
CAGE: 24930 — L3HARRIS TECHNOLOGIES, INC DIV SPACE & AIRBORNE SYSTEMS (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleCROWNED HEXAGON
thread_class2A A
thread_length0.370 INCHES MAXIMUM IN
fastener_length1.250 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
nominal_thread_diameter0.313 INCHES IN
thread_quantity_per_inch18
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
externally_relieved_body_diameter_quantity1
NSN5306-01-156-6396
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 133599-4 · 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
•
FASTENER LENGTH: 1.250 INCHES NOMINAL IN
•
THREAD LENGTH: 0.370 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.313 INCHES IN
•
HEAD STYLE: CROWNED HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY: 1
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
THREAD CLASS: 2A A
TECHNICAL CHARACTERISTICS
FASTENER LENGTH1.250 INCHES NOMINAL IN
THREAD LENGTH0.370 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.313 INCHES IN
HEAD STYLECROWNED HEXAGON
THREAD DIRECTIONRIGHT-HAND
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY1
SURFACE TREATMENTPASSIVATE OVERALL
THREAD CLASS2A A
THREAD QUANTITY PER INCH18
MATERIALSTEEL OVERALL
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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 133599-4?
133599-4 is a BOLT,EXTERNALLY RELIEVED BODY.
What is the NSN for 133599-4?
133599-4 is cataloged in the U.S. Government catalog under NSN 5306-01-156-6396. 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.