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WC4020-3-7A — SCREW,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

WC4020-3-7A: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL COMP XM-13 OVERALL, head_style: FLAT COUNTERSUNK UNDERCUT, grip_length: 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN, head_height: 0.044 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-027-2005, 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
WC4020-3-7A
NSN: 5305-01-027-2005
FSC: 5305 — Screws
CAGE: 60516 — WEST COAST AEROSPACE, INC. (USA)
SPECIFICATIONS
materialSTEEL COMP XM-13 OVERALL
head_styleFLAT COUNTERSUNK UNDERCUT
grip_length0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
head_height0.044 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN
head_diameter0.377 INCHES MINIMUM AND 0.381 INCHES MAXIMUM IN
thread_length0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN
surface_finish32.0 MICROINCHES THREADS
fastener_length0.828 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN
special_featuresFURNISHED WITH ONE O-RING
thread_directionRIGHT-HAND
NSN5305-01-027-2005
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: WC4020-3-7A · 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
•
SURFACE FINISH: 32.0 MICROINCHES THREADS
•
HEAD HEIGHT: 0.044 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.828 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.190 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK UNDERCUT
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES THREADS
SURFACE FINISH32.0 MICROINCHES GRIP
HEAD HEIGHT0.044 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN
FASTENER LENGTH0.828 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN
THREAD LENGTH0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.190 INCHES IN
HEAD STYLEFLAT COUNTERSUNK UNDERCUT
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
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 4
11925C3-7ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
HT4020-3-7ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
ST3M652C3-7ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
CHT4020-3-7AReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is WC4020-3-7A?
WC4020-3-7A is a SCREW,CLOSE TOLERANCE.
What parts can replace WC4020-3-7A?
There are 4 known substitutes for WC4020-3-7A: 11925C3-7A, HT4020-3-7A, ST3M652C3-7A and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for WC4020-3-7A?
WC4020-3-7A is cataloged in the U.S. Government catalog under NSN 5305-01-027-2005. 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.