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Flat Washer NSN 5310-01-058-3991

Item Description

A washer having a centrally located hole with a solid or laminated cross-section and two flat parallel bearing surfaces. The hole must be 75 percent or less than the largest dimension and the bearing surface finish is greater than 32 microinch (0.8 micrometer). The thickness cannot exceed 25 percent of the largest outside dimension. When the largest outside dimension is less than 1/4 inch or 6mm, the thickness must be 0.006 inches (0.15mm) or greater and for items 1/4 inch (6mm) or larger, the thickness must be 0.016 inches (0.4mm) or greater. The maximum tolerance is applied to dimensions and used as a determining factor. Items with separable lamination use shim. For items fabricated from ceramic or electrically rated materials by specification or industry standards use insulator (1), washer. Excludes disk, valve, graphite impregnated and lubricated items.

NSN 5310-01-058-3991 NSN: 5310-01-058-3991

Features and Characteristics

Cross Sectional Shape
Rectangular
Hole Diameter
Between 0.188 inches and 0.192 inches
Edge Shape
Round
Center Hole Shape
1 round
Thickness
Between 0.014 inches and 0.016 inches
Overall Diameter
Between 0.270 inches and 0.280 inches
Material
Steel comp 301 or steel comp 302
Material Specification
Qq-s-766, temper full hard, finish no. 2b federal specification 1st material response or qq-s-766, temper 1/2 hard, finish no. 2b federal specification 2nd material response
Surface Treatment
Passivate and oxide film
Surface Treatment Specification
Qq-p-35 federal specification 1st treatment response and mil-c-13924, cl 2 military specification 2nd treatment response
FSC
5310 Nuts And Washers
NIIN
010583991
NSN
5310010583991

Manufacturer Part Numbers

Part numbers registered to this national stock number.
Part Number
Cage
Status
MSDS
Part Number:
928C961P18
Cage Code:
89954
Status:
A
MSDS:

Foreign Trade & Schedule B

What is a Schedule B number? Find more information at help.cbp.gov
  • Schedule B Number: 7318220000
  • NAICS: 332722
  • SITC: 69422
  • Description: Washers other than lock washers, iron or steel
  • End Use (Code 12300):
    Finished metal shapes

Q & A

Frequently asked questions for NSN 5310-01-058-3991
What are the manufacturers of nsn 5310010583991?
Does this nsn 5310010583991 have a shelf life?
No. This NSN does not have an applicable shelf life.
What is the formal definition of nsn 5310010583991
A washer having a centrally located hole with a solid or laminated cross-section and two flat parallel bearing surfaces. the hole must be 75 percent or less than the largest dimension and the bearing surface finish is greater than 32 microinch (0.8 micrometer). the thickness cannot exceed 25 percent of the largest outside dimension. when the largest outside dimension is less than 1/4 inch or 6mm, the thickness must be 0.006 inches (0.15mm) or greater and for items 1/4 inch (6mm) or larger, the thickness must be 0.016 inches (0.4mm) or greater. the maximum tolerance is applied to dimensions and used as a determining factor. items with separable lamination use shim. for items fabricated from ceramic or electrically rated materials by specification or industry standards use insulator (1), washer. excludes disk, valve, graphite impregnated and lubricated items.
Does nsn 5310010583991 contain any precious metals?
No precious metal content.
Does nsn 5310010583991 contain any hazardous materials?
No MSDS. No hazardous material.
What is the ESD classification of nsn 5310010583991?
No known electrostatic discharge.

Identification Group

Item Identification Guide (IIG) and Item Name Code (INC)
INC
FIIG
App. Key
Cond. Code
Status
INC:
13393
FIIG:
A022B0
App. Key:
B
Cond. Code:
1
Status:
A

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