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WC4020-34Y — SCREW,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

WC4020-34Y: SCREW,SHOULDER.

The SCREW,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP XM-13 OVERALL, head_style: FLAT COUNTERSUNK UNDERCUT, head_height: 0.0320 INCHES MINIMUM AND 0.0340 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.377 INCHES MINIMUM AND 0.381 INCHES MAXIMUM IN, thread_length: 0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-141-7904, 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
WC4020-34Y
NSN: 5305-01-141-7904
FSC: 5305 — Screws
CAGE: 60516 — WEST COAST AEROSPACE, INC. (USA)
SPECIFICATIONS
materialSTEEL COMP XM-13 OVERALL
head_styleFLAT COUNTERSUNK UNDERCUT
head_height0.0320 INCHES MINIMUM AND 0.0340 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.377 INCHES MINIMUM AND 0.381 INCHES MAXIMUM IN
thread_length0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length0.640 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN
shoulder_length0.206 INCHES MINIMUM AND 0.228 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
countersink_angle100.0 DEGREES NOMINAL
shoulder_diameter0.2177 INCHES MINIMUM AND 0.2182 INCHES MAXIMUM FIRST SHOULDER IN
NSN5305-01-141-7904
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: WC4020-34Y · 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 HEIGHT: 0.0320 INCHES MINIMUM AND 0.0340 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.640 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 0.206 INCHES MINIMUM AND 0.228 INCHES MAXIMUM FIRST SHOULDER IN
•
SHOULDER DIAMETER: 0.2177 INCHES MINIMUM AND 0.2182 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.190 INCHES IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.0320 INCHES MINIMUM AND 0.0340 INCHES MAXIMUM IN
FASTENER LENGTH0.640 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN
SHOULDER LENGTH0.206 INCHES MINIMUM AND 0.228 INCHES MAXIMUM FIRST SHOULDER IN
SHOULDER DIAMETER0.2177 INCHES MINIMUM AND 0.2182 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.190 INCHES IN
HEAD STYLEFLAT COUNTERSUNK UNDERCUT
THREAD DIRECTIONRIGHT-HAND
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-001-5016 5305-00-001-9160 5305-00-001-9629 5305-00-001-9742 5305-00-001-9768 5305-00-003-4306 5305-00-003-6694 5305-00-003-6753
SUBSTITUTES & CROSS-REFERENCES 2
HT4020-3-4YSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
3M902C3-4DReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is WC4020-34Y?
WC4020-34Y is a SCREW,SHOULDER.
What parts can replace WC4020-34Y?
There are 2 known substitutes for WC4020-34Y: HT4020-3-4Y, 3M902C3-4D. Substitute compatibility should be verified for your specific system.
What is the NSN for WC4020-34Y?
WC4020-34Y is cataloged in the U.S. Government catalog under NSN 5305-01-141-7904. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.