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Technical Data Sheet
PartsTable / COMPONENT / MIL-B-6812
MIL-B-6812 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include hole_type: DRILLED, head_style: HEXAGON, grip_length: 3.484 INCHES MINIMUM AND 3.576 INCHES MAXIMUM IN, head_height: 0.359 INCHES MINIMUM AND 0.391 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.9975 INCHES MINIMUM AND 0.9985 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-063-3268, 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
MIL-B-6812
NSN: 5306-00-063-3268
FSC: 5306
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
materialSTEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 4130 OR STEEL COMP 4037 OVERALL
hole_typeDRILLED
head_styleHEXAGON
grip_length3.484 INCHES MINIMUM AND 3.576 INCHES MAXIMUM IN
head_height0.359 INCHES MINIMUM AND 0.391 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.9975 INCHES MINIMUM AND 0.9985 INCHES MAXIMUM IN
hole_diameter0.065 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN
hole_quantity3
thread_length0.797 INCHES NOMINAL IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length4.031 INCHES MINIMUM AND 4.078 INCHES MAXIMUM IN
NSN5306-00-063-3268
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MIL-B-6812 · 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
•
THREAD LENGTH: 0.968 INCHES MINIMUM IN
•
THREAD CLASS: 3A A
•
HEAD STYLE: HEXAGON
•
HOLE DIAMETER: 0.070 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.625 INCHES IN
•
HOLE TYPE: DRILLED
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
THREAD LENGTH0.968 INCHES MINIMUM IN
THREAD CLASS3A A
HEAD STYLEHEXAGON
HOLE DIAMETER0.070 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.625 INCHES IN
HOLE TYPEDRILLED
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS0.928 INCHES MINIMUM AND 0.939 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6050 MIL SPEC 3RD MATERIAL RESPONSE OR MIL-S-6098 MIL SPEC 4TH MATERIAL RESPONSE OR MIL-S-6758 MIL SPEC 5TH MATERIAL RESPONSE OR AMS 6300 ASSN STD 6TH MATERIAL RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
AN3-4Upgraded Successor
successor cross-reference
successor
MILB6812Upgraded Successor
successor cross-reference
successor
85H30Upgraded Successor
successor cross-reference
successor
NASM6812Upgraded Successor
successor cross-reference
successor
83T26Upgraded Successor
successor cross-reference
successor
AN173H26Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-B-6812?
MIL-B-6812 is a BOLT,MACHINE.
What parts can replace MIL-B-6812?
There are 15 known substitutes for MIL-B-6812: AN3-4, MILB6812, 85H30 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-B-6812?
MIL-B-6812 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-063-3268. This indicates validated use in U.S. government and defense supply chains.
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PartsTable Design LLC · partstable.com
Last verified: July 2026