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373663 — BOLT,EXTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

373663: BOLT,EXTERNALLY RELIEVED BODY.

The BOLT,EXTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY X-750 OVERALL, head_style: HEXAGON, head_height: 0.160 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.930 INCHES MINIMUM AND 0.970 INCHES MAXIMUM IN, fastener_length: 2.430 INCHES MINIMUM AND 2.450 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-687-6042, 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
373663
NSN: 5306-00-687-6042
NIINs: 006876042, 012680139
FSC: 5306 — Bolts
CAGE: 2T498 — MORTON GRINDING, INC DBA MORTON MANUFACTURING (USA)
SPECIFICATIONS
materialNICKEL ALLOY X-750 OVERALL
head_styleHEXAGON
head_height0.160 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN
thread_class3A A
thread_length0.930 INCHES MINIMUM AND 0.970 INCHES MAXIMUM IN
fastener_length2.430 INCHES MINIMUM AND 2.450 INCHES MAXIMUM IN
hardness_rating32.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
width_between_flats0.428 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
nominal_thread_diameter0.250 INCHES IN
first_diameter_from_head0.248 INCHES MINIMUM AND 0.249 INCHES MAXIMUM IN
third_diameter_from_head0.248 INCHES MINIMUM AND 0.249 INCHES MAXIMUM IN
NSN5306-00-687-6042
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 373663 · 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: 0.160 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN
•
FASTENER LENGTH: 2.430 INCHES MINIMUM AND 2.450 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.930 INCHES MINIMUM AND 0.970 INCHES MAXIMUM IN
•
HARDNESS RATING: 32.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM OVERALL
•
FIRST DIAMETER FROM HEAD: 0.248 INCHES MINIMUM AND 0.249 INCHES MAXIMUM IN
•
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER: 1.250 INCHES MINIMUM AND 1.270 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF THIRD DIAMETER: 1.480 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.160 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN
FASTENER LENGTH2.430 INCHES MINIMUM AND 2.450 INCHES MAXIMUM IN
THREAD LENGTH0.930 INCHES MINIMUM AND 0.970 INCHES MAXIMUM IN
HARDNESS RATING32.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM OVERALL
FIRST DIAMETER FROM HEAD0.248 INCHES MINIMUM AND 0.249 INCHES MAXIMUM IN
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER1.250 INCHES MINIMUM AND 1.270 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.250 INCHES IN
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF THIRD DIAMETER1.480 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
SUBSTITUTES & CROSS-REFERENCES 1
373662-3Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 373663?
373663 is a BOLT,EXTERNALLY RELIEVED BODY.
What parts can replace 373663?
There is 1 known substitute for 373663: 373662-3. Substitute compatibility should be verified for your specific system.
What is the NSN for 373663?
373663 is cataloged in the U.S. Government catalog under NSN 5306-00-687-6042. 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.