PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

40388Washer,split

Fastenal Company Dba Fastenal Co · NSN 5310-01-690-3496 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-01-690-3496 — this item is cataloged by the U.S. Government under National Stock Number 5310-01-690-3496. Primary manufacturer part number: 40388.
Features
  • Washer,split — FSC 5310
  • Hole Diameter: 18.2 MILLIMETERS NOMINAL MM
  • Material: STEEL OVERALL
  • Style Designator: SPLIT
  • Surface Treatment: ZINC OVERALL
  • Material Thickness: 3.5 MILLIMETERS NOMINAL MM
  • Outside Diameter: 29.4 MILLIMETERS NOMINAL MM
  • 1 verified cross-reference
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Overall construction
General Description

The Washer,split, cataloged under National Stock Number 5310-01-690-3496, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Fastenal Company Dba Fastenal Co. 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. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-01-690-3496
Primary Part Number40388
Item NameWasher,split
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerFastenal Company Dba Fastenal Co
StatusACTIVE
Hole Diameter18.2 MILLIMETERS NOMINAL MM
MaterialSTEEL OVERALL
Style DesignatorSPLIT
Surface TreatmentZINC OVERALL
Material Thickness3.5 MILLIMETERS NOMINAL MM
Outside Diameter29.4 MILLIMETERS NOMINAL MM
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
5950-00-102-9497 INTERCHANGEABLE
Transformer,power
5965-00-127-154940388 INTERCHANGEABLE
Housing
L3harris Technologies, Inc. Dba Harris Corporation
5940-00-578-3484011-2004-00-0-479 INTERCHANGEABLE
Terminal,feedthru
Itt Cannon Rf Products
2940-01-062-3966 INTERCHANGEABLE
Air Horn,air Cleaner
Cross-Reference Index
Part NumberManufacturer
40388 PRIMARY Fastenal Company Dba Fastenal Co (USA)
Related Parts
5950-00-102-9497INTERCHANGEABLE
TRANSFORMER,POWER
5965-00-127-1549INTERCHANGEABLE
HOUSING
40388
5940-00-578-3484INTERCHANGEABLE
TERMINAL,FEEDTHRU
011-2004-00-0-479
2940-01-062-3966INTERCHANGEABLE
AIR HORN,AIR CLEANER

Frequently Asked Questions

What is NSN 5310-01-690-3496?

NSN 5310-01-690-3496 is a Washer,split, manufactured by Fastenal Company Dba Fastenal Co, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-01-690-3496?

NSN 5310-01-690-3496 has 1 cross-referenced part number: 40388 (Fastenal Company Dba Fastenal Co).

What NSN replaces 5310-01-690-3496?

There are 4 known substitutes for 5310-01-690-3496: 5950-00-102-9497, 5965-00-127-1549, 5940-00-578-3484 and 1 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 40388?

Key specifications for 40388: Hole Diameter: 18.2 MILLIMETERS NOMINAL MM; Material: STEEL OVERALL; Style Designator: SPLIT; Surface Treatment: ZINC OVERALL. 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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