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Technical Data Sheet
PartsTable / COMPONENT / M63FS813-12CR
M63FS813-12CR ✓ 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,CAP,SOCKET HEAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: ROUND, head_height: 0.245 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.851 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN, thread_length: 0.580 INCHES MINIMUM AND 0.766 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 5305-00-838-7325, 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
M63FS813-12CR
NSN: 5305-00-838-7325
FSC: 5305
CAGE: 26233 — NYLOK LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleROUND
head_height0.245 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.851 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN
thread_length0.580 INCHES MINIMUM AND 0.766 INCHES MAXIMUM IN
fastener_length0.734 INCHES MINIMUM AND 0.766 INCHES MAXIMUM IN
hardness_rating36.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
locking_featurePELLET THREADS
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND CHROMATE OVERALL
width_across_flats0.312 INCHES NOMINAL IN
NSN5305-00-838-7325
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: M63FS813-12CR · 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
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD LENGTH: 0.580 INCHES MINIMUM AND 0.766 INCHES MAXIMUM IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
THREAD CLASS: 3A A
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH ACROSS FLATS: 0.312 INCHES NOMINAL IN
•
MINIMUM TENSILE STRENGTH: 160000 POUNDS PER SQUARE INCH LBS
•
HARDNESS RATING: 36.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD SINGLE MATERIAL RESPONSE OVERALL
THREAD LENGTH0.580 INCHES MINIMUM AND 0.766 INCHES MAXIMUM IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
THREAD CLASS3A A
THREAD DIRECTIONRIGHT-HAND
WIDTH ACROSS FLATS0.312 INCHES NOMINAL IN
MINIMUM TENSILE STRENGTH160000 POUNDS PER SQUARE INCH LBS
HARDNESS RATING36.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
NONDEFINITIVE SPEC/STD DATA8 TYPE
INTERNAL DRIVE STYLEHEXAGON
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
MIL-F-18240EInterchangeable
interchangeable cross-reference
interchangeable
NK515-8R16Interchangeable
interchangeable cross-reference
interchangeable
LL35275-218Interchangeable
interchangeable cross-reference
interchangeable
FFS86Interchangeable
interchangeable cross-reference
interchangeable
MS21262-60Interchangeable
interchangeable cross-reference
interchangeable
FF-S-86EInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M63FS813-12CR?
M63FS813-12CR is a SCREW,CAP,SOCKET HEAD.
What parts can replace M63FS813-12CR?
There are 18 known substitutes for M63FS813-12CR: MIL-F-18240E, NK515-8R16, LL35275-218 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for M63FS813-12CR?
M63FS813-12CR is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-838-7325. 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