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WC1277E4D5A — BOLT,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

WC1277E4D5A: BOLT,CLOSE TOLERANCE.

The BOLT,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY 718 OVERALL, head_style: FILLISTER COUNTERSUNK, grip_length: 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN, head_height: 0.057 INCHES NOMINAL IN, thread_class: 3A A, grip_diameter: 0.2646 INCHES MINIMUM AND 0.2651 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-536-4433, 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
WC1277E4D5A
NSN: 5306-01-536-4433
FSC: 5306 — Bolts
CAGE: 60516 — WEST COAST AEROSPACE, INC. (USA)
SPECIFICATIONS
materialNICKEL ALLOY 718 OVERALL
head_styleFILLISTER COUNTERSUNK
grip_length0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN
head_height0.057 INCHES NOMINAL IN
thread_class3A A
grip_diameter0.2646 INCHES MINIMUM AND 0.2651 INCHES MAXIMUM IN
head_diameter0.265 INCHES MINIMUM AND 0.272 INCHES MAXIMUM IN
thread_length0.410 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
fastener_length0.722 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN
special_featuresINTERNAL DRIVE RECESS PER NAS 1800
thread_directionRIGHT-HAND
countersink_angle99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
NSN5306-01-536-4433
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: WC1277E4D5A · 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: 0.057 INCHES NOMINAL IN
•
FASTENER LENGTH: 0.722 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN
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SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-L-87132,TY 1,GR B MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.410 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
•
SUPPLEMENTARY FEATURES: 0.076 INCH DIA COTTER PIN HOLE AT THE TIP OF THE BOLT 0.106 INCH FROM THE END IN
•
CRITICALITY CODE JUSTIFICATION: AGAV
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.057 INCHES NOMINAL IN
FASTENER LENGTH0.722 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-L-87132,TY 1,GR B MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.410 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
SUPPLEMENTARY FEATURES0.076 INCH DIA COTTER PIN HOLE AT THE TIP OF THE BOLT 0.106 INCH FROM THE END IN
CRITICALITY CODE JUSTIFICATIONAGAV
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEFILLISTER COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
OTHER ITEMS IN FSC 5306 — Bolts
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5306-00-001-1276 5306-00-001-1949 5306-00-001-1988 5306-00-001-1989 5306-00-001-1990 5306-00-001-1991 5306-00-001-1993 5306-00-001-2017
SUBSTITUTES & CROSS-REFERENCES 3
3M1277E4D5ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
TX1027E4D5XASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
11861E4D5ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is WC1277E4D5A?
WC1277E4D5A is a BOLT,CLOSE TOLERANCE.
What parts can replace WC1277E4D5A?
There are 3 known substitutes for WC1277E4D5A: 3M1277E4D5A, TX1027E4D5XA, 11861E4D5A. Substitute compatibility should be verified for your specific system.
What is the NSN for WC1277E4D5A?
WC1277E4D5A is cataloged in the U.S. Government catalog under NSN 5306-01-536-4433. 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.