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4037566 — BOLT,EXTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

4037566: BOLT,EXTERNALLY RELIEVED BODY.

The BOLT,EXTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY OVERALL, thread_class: 3A A, thread_length: 0.650 INCHES MINIMUM AND 0.754 INCHES MAXIMUM IN, fastener_length: 1.710 INCHES MINIMUM AND 1.730 INCHES MAXIMUM IN, hardness_rating: 34.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM OVERALL, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-385-9201, 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
4037566
NSN: 5306-00-385-9201
FSC: 5306 — Bolts
CAGE: 0UCY9 — M.S. AEROSPACE INC. DBA MS AEROSPACE INC (USA)
SPECIFICATIONS
materialNICKEL ALLOY OVERALL
thread_class3A A
thread_length0.650 INCHES MINIMUM AND 0.754 INCHES MAXIMUM IN
fastener_length1.710 INCHES MINIMUM AND 1.730 INCHES MAXIMUM IN
hardness_rating34.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
nominal_thread_diameter0.312 INCHES IN
first_diameter_from_head0.330 INCHES MINIMUM AND 0.331 INCHES MAXIMUM IN
minimum_tensile_strength175000 POUNDS PER SQUARE INCH LBS
thread_quantity_per_inch24
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF)
second_diameter_from_head0.247 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN
NSN5306-00-385-9201
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 4037566 · 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: 1.710 INCHES MINIMUM AND 1.730 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.650 INCHES MINIMUM AND 0.754 INCHES MAXIMUM IN
•
HARDNESS RATING: 34.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM OVERALL
•
SHANK UNTHREADED HOLE DIAMETER: 0.060 INCHES MINIMUM AND 0.080 INCHES MAXIMUM FIRST HOLE IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5708 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
FIRST DIAMETER FROM HEAD: 0.330 INCHES MINIMUM AND 0.331 INCHES MAXIMUM IN
•
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER: 0.976 INCHES MINIMUM AND 1.060 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.312 INCHES IN
TECHNICAL CHARACTERISTICS
FASTENER LENGTH1.710 INCHES MINIMUM AND 1.730 INCHES MAXIMUM IN
THREAD LENGTH0.650 INCHES MINIMUM AND 0.754 INCHES MAXIMUM IN
HARDNESS RATING34.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM OVERALL
SHANK UNTHREADED HOLE DIAMETER0.060 INCHES MINIMUM AND 0.080 INCHES MAXIMUM FIRST HOLE IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5708 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
FIRST DIAMETER FROM HEAD0.330 INCHES MINIMUM AND 0.331 INCHES MAXIMUM IN
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER0.976 INCHES MINIMUM AND 1.060 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.312 INCHES IN
THREAD DIRECTIONRIGHT-HAND
SECOND DIAMETER FROM HEAD0.247 INCHES MINIMUM AND 0.251 INCHES MAXIMUM 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: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4037566?
4037566 is a BOLT,EXTERNALLY RELIEVED BODY.
What is the NSN for 4037566?
4037566 is cataloged in the U.S. Government catalog under NSN 5306-00-385-9201. This indicates validated use in U.S. government and defense supply chains.
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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.