PartsTable
Technical Data Sheet
VS2579-1C ✓ 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 COMP 8740 OVERALL, head_style: FLAT COUNTERSUNK, thread_class: 3A A, head_diameter: 0.249 INCHES MINIMUM AND 0.259 INCHES MAXIMUM IN, thread_length: 0.343 INCHES MAXIMUM IN, fastener_length: 0.343 INCHES NOMINAL 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 5305-00-921-0018, 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
VS2579-1C
NSN: 5305-00-921-0018
FSC: 5305
CAGE: 92215 — HOWMET GLOBAL FASTENING SYSTEMS INC DIV TORRANCE OPERATIONS (USA)
SPECIFICATIONS
materialSTEEL COMP 8740 OVERALL
head_styleFLAT COUNTERSUNK
thread_class3A A
head_diameter0.249 INCHES MINIMUM AND 0.259 INCHES MAXIMUM IN
thread_length0.343 INCHES MAXIMUM IN
fastener_length0.343 INCHES NOMINAL IN
hardness_rating36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
countersink_angle100.0 DEGREES NOMINAL
surface_treatmentCADMIUM AND CHROMATE OVERALL
width_across_flats0.063 INCHES MINIMUM AND 0.064 INCHES MAXIMUM IN
internal_drive_styleHEXAGON
NSN5305-00-921-0018
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: VS2579-1C · 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
WIDTH ACROSS FLATS: 0.063 INCHES MINIMUM AND 0.064 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH: 32
COUNTERSINK ANGLE: 100.0 DEGREES NOMINAL
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
HARDNESS RATING: 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL
HEAD STYLE: FLAT COUNTERSUNK
FASTENER LENGTH: 0.343 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS0.063 INCHES MINIMUM AND 0.064 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH32
COUNTERSINK ANGLE100.0 DEGREES NOMINAL
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
HARDNESS RATING36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL
HEAD STYLEFLAT COUNTERSUNK
FASTENER LENGTH0.343 INCHES NOMINAL IN
HEAD DIAMETER0.249 INCHES MINIMUM AND 0.259 INCHES MAXIMUM IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
177039-65Interchangeable
interchangeable cross-reference
interchangeable
F12Interchangeable
interchangeable cross-reference
interchangeable
F12X1Interchangeable
interchangeable cross-reference
interchangeable
G322-050-011Interchangeable
interchangeable cross-reference
interchangeable
S8Interchangeable
interchangeable cross-reference
interchangeable
155971G1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is VS2579-1C?
VS2579-1C is a SCREW,CAP,SOCKET HEAD.
What parts can replace VS2579-1C?
There are 21 known substitutes for VS2579-1C: 177039-65, F12, F12X1 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for VS2579-1C?
VS2579-1C is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-921-0018. This indicates validated use in U.S. government and defense supply chains.
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