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6866709 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

6866709: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 321 OVERALL, hole_diameter: 0.255 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN, hardness_rating: 50.0 ROCKWELL C NOMINAL, outside_diameter: 0.440 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN, material_thickness: 0.028 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN, external_prebent_key_length: 0.100 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-321-4797, 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
6866709
NSN: 5310-00-321-4797
FSC: 5310 — Nuts and Washers
CAGE: 73342 — ALLISON TRANSMISSION INC DBA ALLISON TRANSMISSION, INC (USA)
SPECIFICATIONS
materialSTEEL COMP 321 OVERALL
hole_diameter0.255 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
hardness_rating50.0 ROCKWELL C NOMINAL
outside_diameter0.440 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN
material_thickness0.028 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN
external_prebent_key_length0.100 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN
external_straight_key_width0.200 INCHES NOMINAL IN
material_document_and_classificationAMS 5510 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
distance_from_centerline_to_inside_of_prebent_key0.370 INCHES NOMINAL IN
NSN5310-00-321-4797
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 6866709 · 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
•
DISTANCE FROM CENTERLINE TO INSIDE OF PREBENT KEY: 0.370 INCHES NOMINAL IN
•
EXTERNAL PREBENT KEY LENGTH: 0.100 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN
•
HARDNESS RATING: 50.0 ROCKWELL C NOMINAL
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5510 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.440 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.028 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN
•
EXTERNAL STRAIGHT KEY WIDTH: 0.200 INCHES NOMINAL IN
•
MATERIAL: STEEL COMP 321 OVERALL
TECHNICAL CHARACTERISTICS
DISTANCE FROM CENTERLINE TO INSIDE OF PREBENT KEY0.370 INCHES NOMINAL IN
EXTERNAL PREBENT KEY LENGTH0.100 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN
HARDNESS RATING50.0 ROCKWELL C NOMINAL
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5510 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.440 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN
MATERIAL THICKNESS0.028 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN
EXTERNAL STRAIGHT KEY WIDTH0.200 INCHES NOMINAL IN
MATERIALSTEEL COMP 321 OVERALL
HOLE DIAMETER0.255 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
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

No substitute or cross-reference records for this part.

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 6866709?
6866709 is a WASHER,KEY.
What is the NSN for 6866709?
6866709 is cataloged in the U.S. Government catalog under NSN 5310-00-321-4797. 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.