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Flat Washer NSN 5310-01-031-8370

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 5310-01-031-8370 NSN: 5310-01-031-8370

Features and Characteristics

Cross Sectional Shape
Rectangular
Hole Diameter
Between 0.564 inches and 0.568 inches
Edge Shape
Round
Center Hole Shape
1 round
Thickness
0.187 inches
Overall Diameter
1.375 inches
Hardness Rating
27.0 rockwell c or 35.0 rockwell c
Outside Left Corner Chamfer Angle
45.0 degrees
Outside Right Corner Chamfer Angle
45.0 degrees
Inside Left Corner Chamfer Angle
45.0 degrees
Criticality Code Justification
Zzzw
Inside Right Corner Chamfer Angle
45.0 degrees
Color
Black
Material
Steel comp 4140
Surface Treatment
Oxide film
Departure From Cited Document
As differentiated by special quality control testing for mk 48 torpedo
FSC
5310 Nuts And Washers
NIIN
010318370
NSN
5310010318370

Manufacturer Part Numbers

Part numbers registered to this national stock number.
Part Number
Cage
Status
MSDS
Part Number:
2508735
Cage Code:
10001
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 5310-01-031-8370
What are the manufacturers of nsn 5310010318370?
Does this nsn 5310010318370 have a shelf life?
No. This NSN does not have an applicable shelf life.
What is the formal definition of nsn 5310010318370
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 5310010318370 contain any precious metals?
Precious metal content is unknown.
Does nsn 5310010318370 contain any hazardous materials?
No MSDS. No hazardous material.
What is the ESD classification of nsn 5310010318370?
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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