PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

NAS1640-4Washer,lock

National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use · NSN 5310-00-442-6913 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-442-6913 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-442-6913. Primary manufacturer part number: NAS1640-4.
Features
  • Washer,lock — FSC 5310
  • Material Thickness: 0.025 INCHES MINIMUM AND 0.031 INCHES MAXIMUM IN
  • Style Designator: SPLIT HELICAL-RIGHT HAND
  • Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
  • Material Document and Classification: FED STD 66,CREW 300 SERIES MIL STD SINGLE MATERIAL RESPONSE OVERALL
  • Surface Treatment: PASSIVATE OVERALL
  • Nondefinitive Spec/std Data: C CLASS
  • Hole Diameter: 0.115 INCHES MINIMUM AND 0.124 INCHES MAXIMUM IN
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Corrosion Resisting Overall construction
General Description

The Washer,lock, cataloged under National Stock Number 5310-00-442-6913, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use. Government technical data includes 10 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-00-442-6913
Primary Part NumberNAS1640-4
Item NameWasher,lock
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerNational Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
StatusACTIVE
Material Thickness0.025 INCHES MINIMUM AND 0.031 INCHES MAXIMUM IN
Style DesignatorSPLIT HELICAL-RIGHT HAND
Surface Treatment Document and ClassificationQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
Material Document and ClassificationFED STD 66,CREW 300 SERIES MIL STD SINGLE MATERIAL RESPONSE OVERALL
Surface TreatmentPASSIVATE OVERALL
Nondefinitive Spec/std DataC CLASS
Hole Diameter0.115 INCHES MINIMUM AND 0.124 INCHES MAXIMUM IN
MaterialSTEEL CORROSION RESISTING OVERALL
Hardness Rating35.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM
Outside Diameter0.212 INCHES MAXIMUM IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 1
5310-00-933-8118355-221-0023 INTERCHANGEABLE
Washer,lock
Meggitt (new Hampshire), Inc
Cross-Reference Index
Part NumberManufacturer
FFW84 Federal Specifications Promulgated by General Services Administration Washington DC (USA)
NAS1640-4 PRIMARY National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use (USA)
Related Parts
5310-00-933-8118INTERCHANGEABLE
WASHER,LOCK
355-221-0023

Frequently Asked Questions

What is NSN 5310-00-442-6913?

NSN 5310-00-442-6913 is a Washer,lock, manufactured by National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-00-442-6913?

NSN 5310-00-442-6913 has 2 cross-referenced part numbers: FFW84 (Federal Specifications Promulgated by General Services Administration Washington DC), NAS1640-4 (National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use).

What NSN replaces 5310-00-442-6913?

There is 1 known substitute for 5310-00-442-6913: 5310-00-933-8118. Verify interchangeability with system specifications before substitution.

What are the specifications of NAS1640-4?

Key specifications for NAS1640-4: Material Thickness: 0.025 INCHES MINIMUM AND 0.031 INCHES MAXIMUM IN; Style Designator: SPLIT HELICAL-RIGHT HAND; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Material Document and Classification: FED STD 66,CREW 300 SERIES MIL STD SINGLE MATERIAL RESPONSE OVERALL. 10 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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