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AN3-46 ✓ 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: 4.375 INCHES NOMINAL IN, head_height: 0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.406 INCHES MINIMUM IN, fastener_length: 4.781 INCHES NOMINAL 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 5306-00-144-3679, 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
AN3-46
NSN: 5306-00-144-3679
FSC: 5306
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (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
head_styleHEXAGON
grip_length4.375 INCHES NOMINAL IN
head_height0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
thread_class3A A
thread_length0.406 INCHES MINIMUM IN
fastener_length4.781 INCHES NOMINAL 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_flats0.365 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN
NSN5306-00-144-3679
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: AN3-46 · 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 CLASS: 3A A
•
THREAD LENGTH: 0.406 INCHES MINIMUM IN
•
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER: 4.641 INCHES NOMINAL FIRST HOLE IN
•
WIDTH BETWEEN FLATS: 0.365 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-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 OVERALL
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
•
MINIMUM TENSILE STRENGTH: 125000 POUNDS PER SQUARE INCH LBS
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS3A A
THREAD LENGTH0.406 INCHES MINIMUM IN
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER4.641 INCHES NOMINAL FIRST HOLE IN
WIDTH BETWEEN FLATS0.365 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
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 OVERALL
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
MINIMUM TENSILE STRENGTH125000 POUNDS PER SQUARE INCH LBS
MATERIALSTEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 4130 OR STEEL COMP 4037 OVERALL
THREAD QUANTITY PER INCH32
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
41629Interchangeable
interchangeable cross-reference
interchangeable
41782Interchangeable
interchangeable cross-reference
interchangeable
41781Interchangeable
interchangeable cross-reference
interchangeable
B94.19Interchangeable
interchangeable cross-reference
interchangeable
B24-4Interchangeable
interchangeable cross-reference
interchangeable
5303-0750Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN3-46?
AN3-46 is a BOLT,MACHINE.
What parts can replace AN3-46?
There are 9 known substitutes for AN3-46: 41629, 41782, 41781 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AN3-46?
AN3-46 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-144-3679. 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