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PartsTable / COMPONENT / AN526-640R8
AN526-640R8 ✓ 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: BUTTON, head_height: 0.086 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.303 INCHES MINIMUM AND 0.321 INCHES MAXIMUM IN, thread_length: 0.450 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN, screw_material: STEEL OR STEEL COMP 1010. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-144-3787, 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
AN526-640R8
NSN: 5305-00-144-3787
FSC: 5305
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
head_styleBUTTON
head_height0.086 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.303 INCHES MINIMUM AND 0.321 INCHES MAXIMUM IN
thread_length0.450 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
screw_materialSTEEL OR STEEL COMP 1010
fastener_length0.500 INCHES NOMINAL IN
thread_directionRIGHT-HAND
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.138 INCHES IN
screw_surface_treatmentCADMIUM
minimum_tensile_strength55000 POUNDS PER SQUARE INCH LBS
NSN5305-00-144-3787
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: AN526-640R8 · 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
•
FASTENER LENGTH: 0.500 INCHES NOMINAL IN
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
•
HEAD STYLE: BUTTON
•
THREAD LENGTH: 0.450 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
•
HEAD DIAMETER: 0.303 INCHES MINIMUM AND 0.321 INCHES MAXIMUM IN
•
SCREW MATERIAL: STEEL OR STEEL COMP 1010
•
SCREW MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-630 FED SPEC 2ND MATERIAL RESPONSE OR QQ-S-631 FED SPEC 2ND MATERIAL RESPONSE OR QQ-S-634 FED SPEC 2ND MATERIAL RESPONSE
•
THREAD QUANTITY PER INCH: 40
TECHNICAL CHARACTERISTICS (FLIS)
FASTENER LENGTH0.500 INCHES NOMINAL IN
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
HEAD STYLEBUTTON
THREAD LENGTH0.450 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
HEAD DIAMETER0.303 INCHES MINIMUM AND 0.321 INCHES MAXIMUM IN
SCREW MATERIALSTEEL OR STEEL COMP 1010
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-630 FED SPEC 2ND MATERIAL RESPONSE OR QQ-S-631 FED SPEC 2ND MATERIAL RESPONSE OR QQ-S-634 FED SPEC 2ND MATERIAL RESPONSE
THREAD QUANTITY PER INCH40
HEAD HEIGHT0.086 INCHES MAXIMUM IN
THREAD SERIES DESIGNATORUNF
VERIFIED SUBSTITUTES & CROSS-REFERENCES 1
FFS92ANDTYPE3ANDSTYLE7CInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN526-640R8?
AN526-640R8 is a SCREW,MACHINE.
What parts can replace AN526-640R8?
There is 1 known substitute for AN526-640R8: FFS92ANDTYPE3ANDSTYLE7C. Substitute compatibility should be verified for your specific system.
What is the NSN for AN526-640R8?
AN526-640R8 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-144-3787. 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