PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

4020-26Washer,lock

Itw Shakeproof Automotive Products · NSN 5310-00-198-3725 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-198-3725 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-198-3725. Primary manufacturer part number: 4020-26.
Features
  • Washer,lock — FSC 5310
  • Surface Treatment: CADMIUM OVERALL
  • Outside Diameter: 0.965 INCHES MINIMUM AND 0.985 INCHES MAXIMUM IN
  • Material Thickness: 0.039 INCHES NOMINAL IN
  • Hole Diameter: 0.384 INCHES MINIMUM AND 0.398 INCHES MAXIMUM IN
  • Style Designator: FLAT EXTERNAL AND INTERNAL TEETH
  • Material: STEEL OVERALL
  • 1 verified cross-reference
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Overall construction
General Description

The Washer,lock, cataloged under National Stock Number 5310-00-198-3725, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Itw Shakeproof Automotive Products. Government technical data includes 6 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. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-00-198-3725
Primary Part Number4020-26
Item NameWasher,lock
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerItw Shakeproof Automotive Products
StatusACTIVE
Surface TreatmentCADMIUM OVERALL
Outside Diameter0.965 INCHES MINIMUM AND 0.985 INCHES MAXIMUM IN
Material Thickness0.039 INCHES NOMINAL IN
Hole Diameter0.384 INCHES MINIMUM AND 0.398 INCHES MAXIMUM IN
Style DesignatorFLAT EXTERNAL AND INTERNAL TEETH
MaterialSTEEL OVERALL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
5310-00-193-7448 INTERCHANGEABLE
Washer,lock
5310-00-524-5673 INTERCHANGEABLE
Washer,lock
2915-00-608-4179402026 INTERCHANGEABLE
Stem,shutdown Valve
Woodward, Inc. Div Fuel Systems and Controls
5925-01-017-8074402026 INTERCHANGEABLE
Circuit Breaker
Telemechanics Inc
5340-01-157-5182929024-3 INTERCHANGEABLE
Hook,cover
Raytheon Company Dba Raytheon Co
5998-01-672-308940202-6 INTERCHANGEABLE
Circuit Card Assembly
United Technologies Corp Hamilton Sundstrand Corp
Cross-Reference Index
Part NumberManufacturer
4020-26 Itw Shakeproof Automotive Products (USA)
Related Parts
5310-00-193-7448INTERCHANGEABLE
WASHER,LOCK
5310-00-524-5673INTERCHANGEABLE
WASHER,LOCK
2915-00-608-4179INTERCHANGEABLE
STEM,SHUTDOWN VALVE
402026
5925-01-017-8074INTERCHANGEABLE
CIRCUIT BREAKER
402026
5340-01-157-5182INTERCHANGEABLE
HOOK,COVER
929024-3
5998-01-672-3089INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
40202-6

Frequently Asked Questions

What is NSN 5310-00-198-3725?

NSN 5310-00-198-3725 is a Washer,lock, manufactured by Itw Shakeproof Automotive Products, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-00-198-3725?

NSN 5310-00-198-3725 has 1 cross-referenced part number: 4020-26 (Itw Shakeproof Automotive Products).

What NSN replaces 5310-00-198-3725?

There are 6 known substitutes for 5310-00-198-3725: 5310-00-193-7448, 5310-00-524-5673, 2915-00-608-4179 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 4020-26?

Key specifications for 4020-26: Surface Treatment: CADMIUM OVERALL; Outside Diameter: 0.965 INCHES MINIMUM AND 0.985 INCHES MAXIMUM IN; Material Thickness: 0.039 INCHES NOMINAL IN; Hole Diameter: 0.384 INCHES MINIMUM AND 0.398 INCHES MAXIMUM IN. 6 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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