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Technical Data Sheet
PartsTable / COMPONENT / AN8-51A
AN8-51A ✓ 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 head_style: HEXAGON, grip_length: 4.422 INCHES MINIMUM AND 4.453 INCHES MAXIMUM IN, head_height: 0.265 INCHES MINIMUM AND 0.297 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.750 INCHES MINIMUM AND 0.828 INCHES MAXIMUM IN, fastener_length: 5.203 INCHES MINIMUM AND 5.250 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 5306-00-151-5776, 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
AN8-51A
NSN: 5306-00-151-5776
FSC: 5306
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
materialSTEEL COMP 8740 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 4037 OR STEEL COMP 4130 OR STEEL COMP 4140 OVERALL
head_styleHEXAGON
grip_length4.422 INCHES MINIMUM AND 4.453 INCHES MAXIMUM IN
head_height0.265 INCHES MINIMUM AND 0.297 INCHES MAXIMUM IN
thread_class3A A
thread_length0.750 INCHES MINIMUM AND 0.828 INCHES MAXIMUM IN
fastener_length5.203 INCHES MINIMUM AND 5.250 INCHES MAXIMUM IN
hardness_rating26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
features_providedFINISHED HEAD
surface_treatmentCADMIUM AND CHROMATE OVERALL
width_between_flats0.740 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN
NSN5306-00-151-5776
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: AN8-51A · 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
•
FEATURES PROVIDED: FINISHED HEAD
•
THREAD LENGTH: 0.750 INCHES MINIMUM AND 0.828 INCHES MAXIMUM IN
•
HEAD STYLE: HEXAGON
•
NOMINAL THREAD DIAMETER: 0.500 INCHES IN
•
HARDNESS RATING: 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
•
THREAD QUANTITY PER INCH: 20
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD SERIES DESIGNATOR: UNF
TECHNICAL CHARACTERISTICS (FLIS)
FEATURES PROVIDEDFINISHED HEAD
THREAD LENGTH0.750 INCHES MINIMUM AND 0.828 INCHES MAXIMUM IN
HEAD STYLEHEXAGON
NOMINAL THREAD DIAMETER0.500 INCHES IN
HARDNESS RATING26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
THREAD QUANTITY PER INCH20
THREAD DIRECTIONRIGHT-HAND
THREAD SERIES DESIGNATORUNF
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6049 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6050 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6098 MIL SPEC 3RD MATERIAL RESPONSE OR AMS 6300 ASSN STD 4TH MATERIAL RESPONSE OR MIL-S-6758 MIL SPEC 5TH MATERIAL RESPONSE OR MIL-S-5626 MIL SPEC 6TH MATERIAL RESPONSE OVERALL
HEAD HEIGHT0.265 INCHES MINIMUM AND 0.297 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
AN5CH4AUpgraded Successor
successor cross-reference
successor
NASM3 THRU NASM20Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN8-51A?
AN8-51A is a BOLT,MACHINE.
What parts can replace AN8-51A?
There are 2 known substitutes for AN8-51A: AN5CH4A, NASM3 THRU NASM20. Substitute compatibility should be verified for your specific system.
What is the NSN for AN8-51A?
AN8-51A is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-151-5776. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026