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WC4020-7-26A — SCREW,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

WC4020-7-26A: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL COMP XM-13 FASTENER, head_style: FLAT COUNTERSUNK, grip_length: 1.615 INCHES MINIMUM AND 1.635 INCHES MAXIMUM IN, head_height: 0.096 INCHES MINIMUM AND 0.100 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.4365 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-717-4261, 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
WC4020-7-26A
NSN: 5305-01-717-4261
FSC: 5305 — Screws
CAGE: 60516 — WEST COAST AEROSPACE, INC. (USA)
SPECIFICATIONS
materialSTEEL COMP XM-13 FASTENER
head_styleFLAT COUNTERSUNK
grip_length1.615 INCHES MINIMUM AND 1.635 INCHES MAXIMUM IN
head_height0.096 INCHES MINIMUM AND 0.100 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.4365 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN
head_diameter0.8812 INCHES MINIMUM AND 0.8884 INCHES MAXIMUM IN
thread_length0.656 INCHES NOMINAL IN
surface_finish32.0 MICROINCHES THREADS
fastener_length2.265 INCHES MINIMUM AND 2.312 INCHES MAXIMUM IN
special_featuresO-RING IS MADE OF FLUOROSILICONE RUBBER PER ST7M251; OPERATING TEMPERATURE RANGE -70 DEGREES F TO +350 DEGREES F
thread_directionRIGHT-HAND
NSN5305-01-717-4261
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: WC4020-7-26A · 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: 0.096 INCHES MINIMUM AND 0.100 INCHES MAXIMUM IN
•
FASTENER LENGTH: 2.265 INCHES MINIMUM AND 2.312 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: AMS 2700,METHOD 1 OR 2 NATIONAL STD/SPEC SINGLE TREATMENT RESPONSE FASTENER
•
THREAD LENGTH: 0.656 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5629 AEROSPACE MATERIAL SPEC STD SINGLE MATERIAL RESPONSE FASTENER
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES THREADS
SURFACE FINISH125.0 MICROINCHES GRIP
SURFACE FINISH32.0 MICROINCHES HEAD
HEAD HEIGHT0.096 INCHES MINIMUM AND 0.100 INCHES MAXIMUM IN
FASTENER LENGTH2.265 INCHES MINIMUM AND 2.312 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS 2700,METHOD 1 OR 2 NATIONAL STD/SPEC SINGLE TREATMENT RESPONSE FASTENER
THREAD LENGTH0.656 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5629 AEROSPACE MATERIAL SPEC STD SINGLE MATERIAL RESPONSE FASTENER
SINGLE SHEAR STRENGTHERR-060
NOMINAL THREAD DIAMETER0.4375 INCHES 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 3
HT4020-7-26ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
ST3M652C7-26ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
11925C7-26ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 WC4020-7-26A?
WC4020-7-26A is a SCREW,CLOSE TOLERANCE.
What parts can replace WC4020-7-26A?
There are 3 known substitutes for WC4020-7-26A: HT4020-7-26A, ST3M652C7-26A, 11925C7-26A. Substitute compatibility should be verified for your specific system.
What is the NSN for WC4020-7-26A?
WC4020-7-26A is cataloged in the U.S. Government catalog under NSN 5305-01-717-4261. 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.