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WC8137-4-6A — SCREW,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

WC8137-4-6A: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: TITANIUM ALLOY UNS R56400 FASTENER, head_style: FLAT COUNTERSUNK UNDERCUT, grip_length: 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN, head_height: 0.0713 INCHES MINIMUM AND 0.0733 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-283-4586, 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
WC8137-4-6A
NSN: 5305-00-283-4586
NIINs: 002834586, 013109996
FSC: 5305 — Screws
CAGE: 60516 — WEST COAST AEROSPACE, INC. (USA)
SPECIFICATIONS
materialTITANIUM ALLOY UNS R56400 FASTENER
head_styleFLAT COUNTERSUNK UNDERCUT
grip_length0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
head_height0.0713 INCHES MINIMUM AND 0.0733 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN
head_diameter0.4750 INCHES MINIMUM AND 0.5066 INCHES MAXIMUM IN
thread_length0.443 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
surface_finish32.0 MICROINCHES BEARING SURFACE OF HEAD
fastener_length0.828 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN
special_featuresFLUORSILICONE RUBBER O-RING,PER MIL-R-25988 TY 1,CL 1,GR 70
thread_directionRIGHT-HAND
NSN5305-00-283-4586
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: WC8137-4-6A · 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: 0.071 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.828 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.443 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: NAS621 COMP 6AL-4V ASSN STD SINGLE MATERIAL RESPONSE OR AMS4928 ASSN STD SINGLE MATERIAL RESPONSE OVERALL V
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK UNDERCUT
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES THREADS
SURFACE FINISH32.0 MICROINCHES GRIP
HEAD HEIGHT0.071 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
FASTENER LENGTH0.828 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN
THREAD LENGTH0.443 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONNAS621 COMP 6AL-4V ASSN STD SINGLE MATERIAL RESPONSE OR AMS4928 ASSN STD SINGLE MATERIAL RESPONSE OVERALL V
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEFLAT COUNTERSUNK UNDERCUT
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 5
BM33024V4-6UReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
110179-4-6ASReference document
Same NSN cross-reference
Reference document — Secondary reference
ST3M430V4-6ASReference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
HT271A4-6Reference document
Same NSN cross-reference
Reference document — Secondary reference
HT8137-4-6ASReference document
Same NSN cross-reference
Reference document — Secondary reference
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 WC8137-4-6A?
WC8137-4-6A is a SCREW,CLOSE TOLERANCE.
What parts can replace WC8137-4-6A?
There are 5 known substitutes for WC8137-4-6A: BM33024V4-6U, 110179-4-6AS, ST3M430V4-6AS and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for WC8137-4-6A?
WC8137-4-6A is cataloged in the U.S. Government catalog under NSN 5305-00-283-4586. 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.