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B6278 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

B6278: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.666 INCHES MINIMUM AND 0.676 INCHES MAXIMUM IN, outside_diameter: 0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM IN, style_designator: KEY, surface_treatment: TIN OVERALL, material_thickness: 0.021 INCHES MINIMUM AND 0.041 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-441-6658, 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
B6278
NSN: 5310-00-441-6658
FSC: 5310 — Nuts and Washers
CAGE: 06840 — BENDIX CORP THE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.666 INCHES MINIMUM AND 0.676 INCHES MAXIMUM IN
outside_diameter0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM IN
style_designatorKEY
surface_treatmentTIN OVERALL
material_thickness0.021 INCHES MINIMUM AND 0.041 INCHES MAXIMUM IN
external_key_quantity4
external_prebent_key_width0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
internal_prebent_key_width0.115 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN
internal_prebent_key_length0.084 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
overall_distance_including_keys1.125 INCHES NOMINAL IN
angle_between_first_and_second_key165.0 DEGREES NOMINAL
NSN5310-00-441-6658
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: B6278 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
ANGLE BETWEEN FIRST AND SECOND KEY: 165.0 DEGREES NOMINAL
•
INTERNAL PREBENT KEY WIDTH: 0.115 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN
•
OVERALL DISTANCE INCLUDING KEYS: 1.125 INCHES NOMINAL IN
•
STYLE DESIGNATOR: KEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-698,COND 4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.021 INCHES MINIMUM AND 0.041 INCHES MAXIMUM IN
•
EXTERNAL KEY QUANTITY: 4
TECHNICAL CHARACTERISTICS
ANGLE BETWEEN FIRST AND SECOND KEY165.0 DEGREES NOMINAL
INTERNAL PREBENT KEY WIDTH0.115 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN
OVERALL DISTANCE INCLUDING KEYS1.125 INCHES NOMINAL IN
STYLE DESIGNATORKEY
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-698,COND 4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM IN
MATERIAL THICKNESS0.021 INCHES MINIMUM AND 0.041 INCHES MAXIMUM IN
EXTERNAL KEY QUANTITY4
INTERNAL PREBENT KEY LENGTH0.084 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
SURFACE TREATMENTTIN OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
86278Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is B6278?
B6278 is a WASHER,KEY.
What parts can replace B6278?
There is 1 known substitute for B6278: 86278. Substitute compatibility should be verified for your specific system.
What is the NSN for B6278?
B6278 is cataloged in the U.S. Government catalog under NSN 5310-00-441-6658. 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.