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AN520B3R4 ✓ 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 SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: ROUND, head_height: 0.078 INCHES NOMINAL IN, thread_class: 2A A, head_diameter: 0.169 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN, thread_length: 0.219 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN, screw_material: COPPER ALLOY. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-151-0470, 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
AN520B3R4
NSN: 5305-00-151-0470
FSC: 5305
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
head_styleROUND
head_height0.078 INCHES NOMINAL IN
thread_class2A A
head_diameter0.169 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN
thread_length0.219 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
screw_materialCOPPER ALLOY
fastener_length0.219 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.099 INCHES IN
minimum_tensile_strength55000 POUNDS PER SQUARE INCH LBS
thread_quantity_per_inch56
NSN5305-00-151-0470
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: AN520B3R4 · 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
•
SCREW MATERIAL: COPPER ALLOY
•
HEAD HEIGHT: 0.078 INCHES NOMINAL IN
•
HEAD DIAMETER: 0.169 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.099 INCHES IN
•
THREAD LENGTH: 0.219 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.219 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
•
HEAD STYLE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
SCREW MATERIALCOPPER ALLOY
HEAD HEIGHT0.078 INCHES NOMINAL IN
HEAD DIAMETER0.169 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.099 INCHES IN
THREAD LENGTH0.219 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
FASTENER LENGTH0.219 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
HEAD STYLEROUND
THREAD CLASS2A A
MINIMUM TENSILE STRENGTH55000 POUNDS PER SQUARE INCH LBS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
FFS92ANDTYPE1ANDSTYLE1Interchangeable
interchangeable cross-reference
interchangeable
AN520C6-22Interchangeable
interchangeable cross-reference
interchangeable
29360-3Interchangeable
interchangeable cross-reference
interchangeable
AN520-4-4Interchangeable
interchangeable cross-reference
interchangeable
AN520-4-6Interchangeable
interchangeable cross-reference
interchangeable
AN520-4-12Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN520B3R4?
AN520B3R4 is a SCREW,MACHINE.
What parts can replace AN520B3R4?
There are 17 known substitutes for AN520B3R4: FFS92ANDTYPE1ANDSTYLE1, AN520C6-22, 29360-3 and 14 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AN520B3R4?
AN520B3R4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-151-0470. 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