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PartsTable / COMPONENT / 4000204
4000204 ✓ 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 THUMBSCREW is a the manufacturer industrial component. Key specifications include head_style: THUMB NO. 3, point_style: FLAT, thread_class: 2A A, thread_length: 0.250 INCHES NOMINAL IN, fastener_length: 2.500 INCHES NOMINAL IN, thread_direction: RIGHT-HAND.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-004-3605, 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
4000204
NSN: 5305-00-004-3605
FSC: 5305
CAGE: 29381 — GICHNER SYSTEMS GROUP, INC. DIV C5ISR DIVISION (USA)
SPECIFICATIONS
head_styleTHUMB NO. 3
point_styleFLAT
thread_class2A A
thread_length0.250 INCHES NOMINAL IN
fastener_length2.500 INCHES NOMINAL IN
thread_directionRIGHT-HAND
width_between_flats1.000 INCHES NOMINAL IN
nominal_thread_diameter0.250 INCHES IN
thread_quantity_per_inch20
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5305-00-004-3605
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 4000204 · 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
•
WIDTH BETWEEN FLATS: 1.000 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD STYLE: THUMB NO. 3
•
THREAD CLASS: 2A A
•
THREAD QUANTITY PER INCH: 20
•
THREAD LENGTH: 0.250 INCHES NOMINAL IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS1.000 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLETHUMB NO. 3
THREAD CLASS2A A
THREAD QUANTITY PER INCH20
THREAD LENGTH0.250 INCHES NOMINAL IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
POINT STYLEFLAT
FASTENER LENGTH2.500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
16149Interchangeable
interchangeable cross-reference
interchangeable
16149AInterchangeable
interchangeable cross-reference
interchangeable
X11779Interchangeable
interchangeable cross-reference
interchangeable
16058 PIECE 117Interchangeable
interchangeable cross-reference
interchangeable
981423 ITEM 45Interchangeable
interchangeable cross-reference
interchangeable
161-04900Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4000204?
4000204 is a THUMBSCREW.
What parts can replace 4000204?
There are 6 known substitutes for 4000204: 16149, 16149A, X11779 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4000204?
4000204 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-004-3605. 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