PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

4581Washer,keyway

Marathon Electric, Llc · NSN 5310-00-388-0811 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-388-0811 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-388-0811. Primary manufacturer part number: 4581.
Features
  • Washer,keyway — FSC 5310
  • External Keyway Quantity: 1
  • External Keyway Width: 0.436 INCHES NOMINAL IN
  • External Keyway Length: 0.218 INCHES NOMINAL IN
  • Outside Diameter: 1.838 INCHES MINIMUM AND 1.843 INCHES MAXIMUM IN
  • Material Thickness: 0.0239 INCHES NOMINAL IN
  • Material: STEEL OVERALL
  • Hole Diameter: 0.812 INCHES MINIMUM AND 0.817 INCHES MAXIMUM IN
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Overall construction
General Description

The Washer,keyway, cataloged under National Stock Number 5310-00-388-0811, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Marathon Electric, Llc. Government technical data includes 7 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-00-388-0811
Primary Part Number4581
Item NameWasher,keyway
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerMarathon Electric, Llc
StatusACTIVE
External Keyway Quantity1
External Keyway Width0.436 INCHES NOMINAL IN
External Keyway Length0.218 INCHES NOMINAL IN
Outside Diameter1.838 INCHES MINIMUM AND 1.843 INCHES MAXIMUM IN
Material Thickness0.0239 INCHES NOMINAL IN
MaterialSTEEL OVERALL
Hole Diameter0.812 INCHES MINIMUM AND 0.817 INCHES MAXIMUM IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 10
5996-00-409-030713216E7149 INTERCHANGEABLE
Amplifier,magnetic
Cecom Lr Center
6240-00-557-3065 INTERCHANGEABLE
Lamp,incandescent
4820-00-640-6553 INTERCHANGEABLE
Valve,gate
5910-00-933-4061922-0583-070 INTERCHANGEABLE
Capacitor,variable,air Dielectri
Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems
5820-01-085-16104581 INTERCHANGEABLE
Control Unit Master
Scientific Atlanta Inc
5330-01-103-16164581 INTERCHANGEABLE
Packing,preformed
Liquid Controls, L.l.c. Div Idex Corporation
5940-01-114-90274-581 INTERCHANGEABLE
Terminal,lug
Raytheon Company Dba Raytheon Co
5905-01-117-50144581 INTERCHANGEABLE
Resistor,fixed,wire Wound,induct
Ohmite Holding, L.l.c. Dba Ohmite Manufacturing
4310-01-391-4845 INTERCHANGEABLE
Filter Element,intake Air Cleane
5640-01-590-5835P00641 INTERCHANGEABLE
Insulation Blanket,thermal
General Atomics Aeronautical Systems, Inc.
Cross-Reference Index
Part NumberManufacturer
4581 Marathon Electric, Llc (USA)
Related Parts
5996-00-409-0307INTERCHANGEABLE
AMPLIFIER,MAGNETIC
13216E7149
6240-00-557-3065INTERCHANGEABLE
LAMP,INCANDESCENT
4820-00-640-6553INTERCHANGEABLE
VALVE,GATE
5910-00-933-4061INTERCHANGEABLE
CAPACITOR,VARIABLE,AIR DIELECTRI
922-0583-070
5820-01-085-1610INTERCHANGEABLE
CONTROL UNIT MASTER
4581
5330-01-103-1616INTERCHANGEABLE
PACKING,PREFORMED
4581
5940-01-114-9027INTERCHANGEABLE
TERMINAL,LUG
4-581
5905-01-117-5014INTERCHANGEABLE
RESISTOR,FIXED,WIRE WOUND,INDUCT
4581
4310-01-391-4845INTERCHANGEABLE
FILTER ELEMENT,INTAKE AIR CLEANE
5640-01-590-5835INTERCHANGEABLE
INSULATION BLANKET,THERMAL
P00641

Frequently Asked Questions

What is NSN 5310-00-388-0811?

NSN 5310-00-388-0811 is a Washer,keyway, manufactured by Marathon Electric, Llc, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-00-388-0811?

NSN 5310-00-388-0811 has 1 cross-referenced part number: 4581 (Marathon Electric, Llc).

What NSN replaces 5310-00-388-0811?

There are 10 known substitutes for 5310-00-388-0811: 5996-00-409-0307, 6240-00-557-3065, 4820-00-640-6553 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 4581?

Key specifications for 4581: External Keyway Quantity: 1; External Keyway Width: 0.436 INCHES NOMINAL IN; Special Features: FORMED GROOVE AND NOTCH 180 DEGREES OPPOSIT KEYWAY; External Keyway Length: 0.218 INCHES NOMINAL IN. 8 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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