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PartsTable / COMPONENT / AN520B1-2
AN520B1-2 ✓ 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: 0.061 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.122 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN, thread_length: 0.188 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 5305-00-144-4066, 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
AN520B1-2
NSN: 5305-00-144-4066
FSC: 5305
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
head_styleROUND
head_height0.061 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.122 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN
thread_length0.188 INCHES MAXIMUM IN
screw_materialCOPPER ALLOY
fastener_length0.156 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.073 INCHES IN
minimum_tensile_strength55000 POUNDS PER SQUARE INCH LBS
thread_quantity_per_inch72
NSN5305-00-144-4066
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: AN520B1-2 · 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 DIRECTION: RIGHT-HAND
•
HEAD STYLE: ROUND
•
THREAD LENGTH: 0.188 INCHES MAXIMUM IN
•
SCREW MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-613 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-B-626 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-W-321 FED SPEC SINGLE MATERIAL RESPONSE
•
HEAD HEIGHT: 0.061 INCHES MAXIMUM IN
•
SCREW MATERIAL: COPPER ALLOY
•
FASTENER LENGTH: 0.156 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
•
HEAD DIAMETER: 0.122 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
HEAD STYLEROUND
THREAD LENGTH0.188 INCHES MAXIMUM IN
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-613 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-B-626 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-W-321 FED SPEC SINGLE MATERIAL RESPONSE
HEAD HEIGHT0.061 INCHES MAXIMUM IN
SCREW MATERIALCOPPER ALLOY
FASTENER LENGTH0.156 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
HEAD DIAMETER0.122 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
NOMINAL THREAD DIAMETER0.073 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 1
FFS92ANDTYPE1ANDSTYLE1SInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN520B1-2?
AN520B1-2 is a SCREW,MACHINE.
What parts can replace AN520B1-2?
There is 1 known substitute for AN520B1-2: FFS92ANDTYPE1ANDSTYLE1S. Substitute compatibility should be verified for your specific system.
What is the NSN for AN520B1-2?
AN520B1-2 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-144-4066. 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