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PartsTable / COMPONENT / AN509-8R8REV2
AN509-8R8REV2 ✓ 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: 3A A, head_diameter: 0.283 INCHES MINIMUM AND 0.332 INCHES MAXIMUM IN, thread_length: 0.329 INCHES MINIMUM AND 0.469 INCHES MAXIMUM IN, screw_material: STEEL COMP 8630 OR STEEL COMP 4037, fastener_length: 0.516 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-057-0491, 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
AN509-8R8REV2
NSN: 5305-00-057-0491
FSC: 5305
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
head_styleFLAT COUNTERSUNK
thread_class3A A
head_diameter0.283 INCHES MINIMUM AND 0.332 INCHES MAXIMUM IN
thread_length0.329 INCHES MINIMUM AND 0.469 INCHES MAXIMUM IN
screw_materialSTEEL COMP 8630 OR STEEL COMP 4037
fastener_length0.516 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
hardness_rating26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM
thread_directionRIGHT-HAND
countersink_angle99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
internal_drive_styleCROSS RECESS TYPE 1
end_item_identificationMRAP- COUGAR AMBULANCE
nominal_thread_diameter0.164 INCHES IN
NSN5305-00-057-0491
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: AN509-8R8REV2 · 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
•
NOMINAL THREAD DIAMETER: 0.164 INCHES IN
•
THREAD QUANTITY PER INCH: 32
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
HARDNESS RATING: 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM
•
COUNTERSINK ANGLE: 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
•
MINIMUM TENSILE STRENGTH: 125000 POUNDS PER SQUARE INCH LBS
•
SCREW MATERIAL: STEEL COMP 8630 OR STEEL COMP 4037
•
SCREW MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-6050 MIL SPEC 1ST MATERIAL RESPONSE OR AMS 6300 ASSN STD 2ND MATERIAL RESPONSE
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD DIAMETER0.164 INCHES IN
THREAD QUANTITY PER INCH32
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
HARDNESS RATING26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM
COUNTERSINK ANGLE99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
MINIMUM TENSILE STRENGTH125000 POUNDS PER SQUARE INCH LBS
SCREW MATERIALSTEEL COMP 8630 OR STEEL COMP 4037
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6050 MIL SPEC 1ST MATERIAL RESPONSE OR AMS 6300 ASSN STD 2ND MATERIAL RESPONSE
END ITEM IDENTIFICATIONMRAP- COUGAR AMBULANCE
SCREW SURFACE TREATMENTCADMIUM AND CHROMATE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
MS24694-S5Interchangeable
Same NIIN cross-reference
interchangeable
MILS7839Interchangeable
Same NIIN cross-reference
interchangeable
5305PL0144201Interchangeable
Same NIIN cross-reference
interchangeable
AN509-8R8Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN509-8R8REV2?
AN509-8R8REV2 is a SCREW,MACHINE.
What parts can replace AN509-8R8REV2?
There are 4 known substitutes for AN509-8R8REV2: MS24694-S5, MILS7839, 5305PL0144201 and 1 more. Substitute compatibility should be verified for your specific system.
Is AN509-8R8REV2 still available?
AN509-8R8REV2 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026