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1387058 — WASHER,KEYWAY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

1387058: WASHER,KEYWAY.

The WASHER,KEYWAY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 2.156 INCHES NOMINAL IN, outside_diameter: 3.250 INCHES NOMINAL IN, material_thickness: 0.250 INCHES NOMINAL IN, internal_keyway_width: 0.250 INCHES NOMINAL IN, material_document_and_classification: MIL-S-20166 GR M MIL SPEC SINGLE MATERIAL RESPONSE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-385-9835, 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
1387058
NSN: 5310-00-385-9835
FSC: 5310 — Nuts and Washers
CAGE: 79500 — WESTINGHOUSE ELECTRIC CORP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter2.156 INCHES NOMINAL IN
outside_diameter3.250 INCHES NOMINAL IN
material_thickness0.250 INCHES NOMINAL IN
internal_keyway_width0.250 INCHES NOMINAL IN
internal_keyway_quantity1
material_document_and_classificationMIL-S-20166 GR M MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
distance_from_centerline_to_bottom_of_internal_keyway1.219 INCHES NOMINAL IN
NSN5310-00-385-9835
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1387058 · 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 BOTTOM OF INTERNAL KEYWAY: 1.219 INCHES NOMINAL IN
•
INTERNAL KEYWAY WIDTH: 0.250 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-20166 GR M MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 3.250 INCHES NOMINAL IN
•
INTERNAL KEYWAY QUANTITY: 1
•
MATERIAL THICKNESS: 0.250 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
HOLE DIAMETER: 2.156 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
DISTANCE FROM CENTERLINE TO BOTTOM OF INTERNAL KEYWAY1.219 INCHES NOMINAL IN
INTERNAL KEYWAY WIDTH0.250 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-20166 GR M MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER3.250 INCHES NOMINAL IN
INTERNAL KEYWAY QUANTITY1
MATERIAL THICKNESS0.250 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
HOLE DIAMETER2.156 INCHES NOMINAL 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: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1387058?
1387058 is a WASHER,KEYWAY.
What is the NSN for 1387058?
1387058 is cataloged in the U.S. Government catalog under NSN 5310-00-385-9835. 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.