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2788-1037 — BOLT,INTERNAL WRENCHING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

2788-1037: BOLT,INTERNAL WRENCHING.

The BOLT,INTERNAL WRENCHING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OVERALL, head_style: FLAT CHAMFER, head_height: 0.134 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.221 INCHES MINIMUM AND 0.226 INCHES MAXIMUM IN, thread_length: 0.234 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-649-6979, 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
2788-1037
NSN: 5306-00-649-6979
FSC: 5306 — Bolts
CAGE: 49956 — RAYTHEON COMPANY DIV CORP (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
head_styleFLAT CHAMFER
head_height0.134 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.221 INCHES MINIMUM AND 0.226 INCHES MAXIMUM IN
thread_length0.234 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
fastener_length0.359 INCHES MINIMUM AND 0.391 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
width_across_flats0.094 INCHES MINIMUM AND 0.095 INCHES MAXIMUM IN
internal_drive_styleHEXAGON
nominal_thread_diameter0.138 INCHES IN
first_diameter_from_head0.094 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
NSN5306-00-649-6979
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 2788-1037 · 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
•
WIDTH ACROSS FLATS: 0.094 INCHES MINIMUM AND 0.095 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.134 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.359 INCHES MINIMUM AND 0.391 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.234 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
•
FIRST DIAMETER FROM HEAD: 0.094 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.138 INCHES IN
•
HEAD STYLE: FLAT CHAMFER
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.094 INCHES MINIMUM AND 0.095 INCHES MAXIMUM IN
HEAD HEIGHT0.134 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN
FASTENER LENGTH0.359 INCHES MINIMUM AND 0.391 INCHES MAXIMUM IN
THREAD LENGTH0.234 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
FIRST DIAMETER FROM HEAD0.094 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.138 INCHES IN
HEAD STYLEFLAT CHAMFER
THREAD DIRECTIONRIGHT-HAND
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
INTERNAL DRIVE STYLEHEXAGON
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 1
9084973Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 2788-1037?
2788-1037 is a BOLT,INTERNAL WRENCHING.
What parts can replace 2788-1037?
There is 1 known substitute for 2788-1037: 9084973. Substitute compatibility should be verified for your specific system.
What is the NSN for 2788-1037?
2788-1037 is cataloged in the U.S. Government catalog under NSN 5306-00-649-6979. 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.