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AN505B3-3 ✓ 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 SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: FLAT COUNTERSUNK, thread_class: 2A A, head_diameter: 0.175 INCHES MINIMUM AND 0.199 INCHES MAXIMUM IN, thread_length: 0.146 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN, screw_material: COPPER ALLOY, fastener_length: 0.156 INCHES MINIMUM AND 0.188 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 5305-00-271-3570, 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
AN505B3-3
NSN: 5305-00-271-3570
FSC: 5305
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
head_styleFLAT COUNTERSUNK
thread_class2A A
head_diameter0.175 INCHES MINIMUM AND 0.199 INCHES MAXIMUM IN
thread_length0.146 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
screw_materialCOPPER ALLOY
fastener_length0.156 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
countersink_angle80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
internal_drive_styleSLOT
nominal_thread_diameter0.099 INCHES IN
minimum_tensile_strength55000 POUNDS PER SQUARE INCH LBS
thread_quantity_per_inch48
NSN5305-00-271-3570
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: AN505B3-3 · 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 QUANTITY PER INCH: 48
•
INTERNAL DRIVE STYLE: SLOT
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
THREAD DIRECTION: RIGHT-HAND
•
MINIMUM TENSILE STRENGTH: 55000 POUNDS PER SQUARE INCH LBS
•
COUNTERSINK ANGLE: 80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
•
HEAD DIAMETER: 0.175 INCHES MINIMUM AND 0.199 INCHES MAXIMUM IN
•
HEAD STYLE: FLAT COUNTERSUNK
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH48
INTERNAL DRIVE STYLESLOT
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
THREAD DIRECTIONRIGHT-HAND
MINIMUM TENSILE STRENGTH55000 POUNDS PER SQUARE INCH LBS
COUNTERSINK ANGLE80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
HEAD DIAMETER0.175 INCHES MINIMUM AND 0.199 INCHES MAXIMUM IN
HEAD STYLEFLAT COUNTERSUNK
NOMINAL THREAD DIAMETER0.099 INCHES IN
SCREW MATERIALCOPPER ALLOY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
4361Interchangeable
interchangeable cross-reference
interchangeable
8039Interchangeable
interchangeable cross-reference
interchangeable
678-2390-00Interchangeable
interchangeable cross-reference
interchangeable
321-1210Interchangeable
interchangeable cross-reference
interchangeable
53435Interchangeable
interchangeable cross-reference
interchangeable
TABLE 15, 1210Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN505B3-3?
AN505B3-3 is a SCREW,MACHINE.
What parts can replace AN505B3-3?
There are 19 known substitutes for AN505B3-3: 4361, 8039, 678-2390-00 and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AN505B3-3?
AN505B3-3 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-271-3570. 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