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6864043 — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

6864043: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, recess_angle: 88.0 DEGREES MINIMUM AND 92.0 DEGREES MAXIMUM, hole_diameter: 0.257 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN, hardness_rating: 30.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OR 24.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM, recess_diameter: 0.297 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN, outside_diameter: 0.618 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-855-2043, 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
6864043
NSN: 5310-00-855-2043
FSC: 5310 — Nuts and Washers
CAGE: 73342 — ALLISON TRANSMISSION INC DBA ALLISON TRANSMISSION, INC (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
recess_angle88.0 DEGREES MINIMUM AND 92.0 DEGREES MAXIMUM
hole_diameter0.257 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
hardness_rating30.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OR 24.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
recess_diameter0.297 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN
outside_diameter0.618 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN
style_designatorRECESSED
material_thickness0.070 INCHES MINIMUM AND 0.076 INCHES MAXIMUM IN
material_document_and_classificationAMS5621 ASSN STD ALL MATERIAL RESPONSES OR AMS5628 ASSN STD ALL MATERIAL RESPONSES OVERALL
NSN5310-00-855-2043
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 6864043 · 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
•
HARDNESS RATING: 30.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OR 24.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
•
STYLE DESIGNATOR: RECESSED
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS5621 ASSN STD ALL MATERIAL RESPONSES OR AMS5628 ASSN STD ALL MATERIAL RESPONSES OVERALL
•
OUTSIDE DIAMETER: 0.618 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.070 INCHES MINIMUM AND 0.076 INCHES MAXIMUM IN
•
RECESS DIAMETER: 0.297 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
•
HOLE DIAMETER: 0.257 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
HARDNESS RATING30.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OR 24.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
STYLE DESIGNATORRECESSED
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5621 ASSN STD ALL MATERIAL RESPONSES OR AMS5628 ASSN STD ALL MATERIAL RESPONSES OVERALL
OUTSIDE DIAMETER0.618 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN
MATERIAL THICKNESS0.070 INCHES MINIMUM AND 0.076 INCHES MAXIMUM IN
RECESS DIAMETER0.297 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN
MATERIALSTEEL CORROSION RESISTING OVERALL
HOLE DIAMETER0.257 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
RECESS ANGLE88.0 DEGREES MINIMUM AND 92.0 DEGREES MAXIMUM
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES 1
K11704Same 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 6864043?
6864043 is a WASHER,RECESSED.
What parts can replace 6864043?
There is 1 known substitute for 6864043: K11704. Substitute compatibility should be verified for your specific system.
What is the NSN for 6864043?
6864043 is cataloged in the U.S. Government catalog under NSN 5310-00-855-2043. 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.