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PartsTable / COMPONENT / AN74-3
AN74-3 ✓ 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: DISHED HEXAGON, grip_length: 0.046 INCHES MINIMUM AND 0.078 INCHES MAXIMUM IN, head_height: 0.203 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN, thread_class: 3A A, hole_diameter: 0.070 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 5306-00-156-2656, 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
AN74-3
NSN: 5306-00-156-2656
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
hole_typeDRILLED
head_styleDISHED HEXAGON
grip_length0.046 INCHES MINIMUM AND 0.078 INCHES MAXIMUM IN
head_height0.203 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN
thread_class3A A
hole_diameter0.070 INCHES NOMINAL IN
hole_quantity6
thread_length0.375 INCHES MINIMUM AND 0.454 INCHES MAXIMUM IN
fastener_length0.453 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
hardness_rating26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
NSN5306-00-156-2656
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: AN74-3 · 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: 0.657 INCHES MINIMUM IN
•
HEAD HEIGHT: 0.234 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
•
FASTENER LENGTH: 4.469 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
HARDNESS RATING: 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
•
THREAD CLASS: 3A A
•
MINIMUM TENSILE STRENGTH: 125000 POUNDS PER SQUARE INCH LBS
•
THREAD SERIES DESIGNATOR: UNF
TECHNICAL CHARACTERISTICS (FLIS)
THREAD LENGTH0.657 INCHES MINIMUM IN
HEAD HEIGHT0.234 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
FASTENER LENGTH4.469 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
HARDNESS RATING26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
THREAD CLASS3A A
MINIMUM TENSILE STRENGTH125000 POUNDS PER SQUARE INCH LBS
THREAD SERIES DESIGNATORUNF
FEATURES PROVIDEDFINISHED HEAD
WIDTH BETWEEN FLATS0.615 INCHES MINIMUM AND 0.627 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
23311Interchangeable
interchangeable cross-reference
interchangeable
AN74-3Interchangeable
interchangeable cross-reference
interchangeable
MS20073-04-03Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN74-3?
AN74-3 is a BOLT,MACHINE.
What parts can replace AN74-3?
There are 3 known substitutes for AN74-3: 23311, AN74-3, MS20073-04-03. Substitute compatibility should be verified for your specific system.
What is the NSN for AN74-3?
AN74-3 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-156-2656. 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