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Technical Data Sheet
PartsTable / COMPONENT / 579B1
579B1 ✓ 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,TAPPING is a the manufacturer industrial component. Key specifications include head_style: FLAT COUNTERSUNK, head_diameter: 0.308 INCHES MINIMUM AND 0.332 INCHES MAXIMUM IN, fastener_length: 0.250 INCHES NOMINAL IN, countersink_angle: 80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM, surface_treatment: CADMIUM AND CHROMATE OVERALL, internal_drive_style: SLOT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-737-3275, 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
579B1
NSN: 5305-00-737-3275
FSC: 5305
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
materialSTEEL COMP 1016 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1021 OR STEEL COMP 1022 OR STEEL COMP 1524 OVERALL
head_styleFLAT COUNTERSUNK
head_diameter0.308 INCHES MINIMUM AND 0.332 INCHES MAXIMUM IN
fastener_length0.250 INCHES NOMINAL IN
countersink_angle80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
surface_treatmentCADMIUM AND CHROMATE OVERALL
internal_drive_styleSLOT
nonmachine_thread_styleDOG TYPE (TYPE B OR C)
nondefinitive_spec/std_dataB TYPE
nonmachine_nominal_thread_diameter0.164 INCHES IN
surface_treatment_document_and_classificationQQ-P-416,TYPE 2,CLASS 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
NSN5305-00-737-3275
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 579B1 · 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
•
HEAD STYLE: FLAT COUNTERSUNK
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
•
MATERIAL: STEEL COMP 1016 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1021 OR STEEL COMP 1022 OR STEEL COMP 1524 OVERALL
•
NONMACHINE THREAD STYLE: DOG TYPE (TYPE B OR C)
•
INTERNAL DRIVE STYLE: SLOT
•
COUNTERSINK ANGLE: 80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TYPE 2,CLASS 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
•
NONDEFINITIVE SPEC/STD DATA: B TYPE
TECHNICAL CHARACTERISTICS (FLIS)
HEAD STYLEFLAT COUNTERSUNK
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
MATERIALSTEEL COMP 1016 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1021 OR STEEL COMP 1022 OR STEEL COMP 1524 OVERALL
NONMACHINE THREAD STYLEDOG TYPE (TYPE B OR C)
INTERNAL DRIVE STYLESLOT
COUNTERSINK ANGLE80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE 2,CLASS 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
NONDEFINITIVE SPEC/STD DATAB TYPE
FASTENER LENGTH0.250 INCHES NOMINAL IN
HEAD DIAMETER0.308 INCHES MINIMUM AND 0.332 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
41 1/2 12.5Interchangeable
interchangeable cross-reference
interchangeable
ST500Interchangeable
interchangeable cross-reference
interchangeable
41 1/2SInterchangeable
interchangeable cross-reference
interchangeable
55-0609-1Interchangeable
interchangeable cross-reference
interchangeable
ST-100/AInterchangeable
interchangeable cross-reference
interchangeable
6993-0258-P1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 579B1?
579B1 is a SCREW,TAPPING.
What parts can replace 579B1?
There are 10 known substitutes for 579B1: 41 1/2 12.5, ST500, 41 1/2S and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 579B1?
579B1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-737-3275. This indicates validated use in U.S. government and defense supply chains.
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Last verified: July 2026