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PartsTable / COMPONENT / 203-4646669 ITEM 6
203-4646669 ITEM 6 ✓ 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: 2A A, head_diameter: 0.685 INCHES MINIMUM AND 0.762 INCHES MAXIMUM IN, thread_length: 0.835 INCHES MINIMUM AND 1.020 INCHES MAXIMUM IN, screw_material: NICKEL ALLOY 400, fastener_length: 1.190 INCHES MINIMUM AND 1.250 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 5305-01-172-2530, 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
203-4646669 ITEM 6
NSN: 5305-01-172-2530
FSC: 5305
CAGE: 80064 — NAVAL SHIP SYSTEMS COMMAND (USA)
SPECIFICATIONS
head_styleFLAT COUNTERSUNK
thread_class2A A
head_diameter0.685 INCHES MINIMUM AND 0.762 INCHES MAXIMUM IN
thread_length0.835 INCHES MINIMUM AND 1.020 INCHES MAXIMUM IN
screw_materialNICKEL ALLOY 400
fastener_length1.190 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
countersink_angle80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
internal_drive_styleSLOT
nominal_thread_diameter0.375 INCHES IN
minimum_tensile_strength80000 POUNDS PER SQUARE INCH LBS
thread_quantity_per_inch16
NSN5305-01-172-2530
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 203-4646669 ITEM 6 · 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
•
THREAD DIRECTION: RIGHT-HAND
•
COUNTERSINK ANGLE: 80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
•
SCREW MATERIAL: NICKEL ALLOY 400
•
THREAD CLASS: 2A A
•
THREAD QUANTITY PER INCH: 16
•
HEAD DIAMETER: 0.685 INCHES MINIMUM AND 0.762 INCHES MAXIMUM IN
•
INTERNAL DRIVE STYLE: SLOT
•
SCREW MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-281 CL A FED SPEC SINGLE MATERIAL RESPONSE
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
COUNTERSINK ANGLE80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
SCREW MATERIALNICKEL ALLOY 400
THREAD CLASS2A A
THREAD QUANTITY PER INCH16
HEAD DIAMETER0.685 INCHES MINIMUM AND 0.762 INCHES MAXIMUM IN
INTERNAL DRIVE STYLESLOT
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-281 CL A FED SPEC SINGLE MATERIAL RESPONSE
NOMINAL THREAD DIAMETER0.375 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
245122Interchangeable
interchangeable cross-reference
interchangeable
FF-S-92 TY-1 ST Y-2SInterchangeable
interchangeable cross-reference
interchangeable
MS35200-12Interchangeable
interchangeable cross-reference
interchangeable
1/2 IN 13UNC-2A X 2IN LGInterchangeable
interchangeable cross-reference
interchangeable
1/2 IN- 13 UNC-2A X 1 IN LGInterchangeable
interchangeable cross-reference
interchangeable
5/16-18 UNC-2A X 1 IN LGInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 203-4646669 ITEM 6?
203-4646669 ITEM 6 is a SCREW,MACHINE.
What parts can replace 203-4646669 ITEM 6?
There are 12 known substitutes for 203-4646669 ITEM 6: 245122, FF-S-92 TY-1 ST Y-2S, MS35200-12 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 203-4646669 ITEM 6?
203-4646669 ITEM 6 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-172-2530. 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