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7748639 — BOLT,INTERNAL WRENCHING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

7748639: BOLT,INTERNAL WRENCHING.

The BOLT,INTERNAL WRENCHING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 8630 OR STEEL COMP 4037 OVERALL, head_style: FLAT CHAMFER, head_height: 0.306 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.429 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN, thread_length: 0.460 INCHES MINIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-783-5188, 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
7748639
NSN: 5306-00-783-5188
FSC: 5306 — Bolts
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
materialSTEEL COMP 8630 OR STEEL COMP 4037 OVERALL
head_styleFLAT CHAMFER
head_height0.306 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.429 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
thread_length0.460 INCHES MINIMUM IN
fastener_length0.860 INCHES NOMINAL IN
hardness_rating26.0 ROCKWELL C NOMINAL OVERALL
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND CHROMATE OVERALL
width_across_flats0.219 INCHES MINIMUM AND 0.221 INCHES MAXIMUM IN
internal_drive_styleHEXAGON
NSN5306-00-783-5188
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 7748639 · 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: 0.219 INCHES MINIMUM AND 0.221 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.306 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.860 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TYPE 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.460 INCHES MINIMUM IN
•
HARDNESS RATING: 26.0 ROCKWELL C NOMINAL OVERALL
•
FIRST DIAMETER FROM HEAD: 0.220 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.312 INCHES IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.219 INCHES MINIMUM AND 0.221 INCHES MAXIMUM IN
HEAD HEIGHT0.306 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
FASTENER LENGTH0.860 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.460 INCHES MINIMUM IN
HARDNESS RATING26.0 ROCKWELL C NOMINAL OVERALL
FIRST DIAMETER FROM HEAD0.220 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.312 INCHES IN
HEAD STYLEFLAT CHAMFER
THREAD DIRECTIONRIGHT-HAND
SUBSTITUTES & CROSS-REFERENCES 4
1948537Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
33657Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
72085Reference document
Same NSN cross-reference
Reference document — Secondary reference
5306007835188Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 7748639?
7748639 is a BOLT,INTERNAL WRENCHING.
What parts can replace 7748639?
There are 4 known substitutes for 7748639: 1948537, 33657, 72085 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 7748639?
7748639 is cataloged in the U.S. Government catalog under NSN 5306-00-783-5188. 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.