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Flat Washer NSN 5310-01-178-3981

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 5310-01-178-3981 NSN: 5310-01-178-3981

Features and Characteristics

Cross Sectional Shape
Rectangular
Hole Diameter
Between 0.470 inches and 0.530 inches
Edge Shape
Round
Center Hole Shape
1 round
Thickness
Between 0.203 inches and 0.219 inches
Overall Diameter
Between 0.845 inches and 0.905 inches
Hardness Rating
70.0 shore durometer a
Special Features
Matl rubber silicone class si andsnubber groove 0.031 in. Radius
Material
Rubber
Material Specification
Zz-r-765, class 2a, grade 70 federal specification single material response
FSC
5310 Nuts And Washers
NIIN
011783981
NSN
5310011783981

Manufacturer Part Numbers

Part numbers registered to this national stock number.
Part Number
Cage
Status
MSDS
Part Number:
16610336-001
Cage Code:
28009
Status:
A
MSDS:

Foreign Trade & Schedule B

What is a Schedule B number? Find more information at help.cbp.gov
  • Schedule B Number: 4016930000
  • NAICS: 339991
  • SITC: 62999
  • Description: Gaskets, washers and other seals, of vulcanized rubber other than hard rubber
  • End Use (Code 12750):
    Industrial rubber products

Q & A

Frequently asked questions for NSN 5310-01-178-3981
What are the manufacturers of nsn 5310011783981?
Does this nsn 5310011783981 have a shelf life?
No. This NSN does not have an applicable shelf life.
What is the formal definition of nsn 5310011783981
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 5310011783981 contain any precious metals?
No precious metal content.
Does nsn 5310011783981 contain any hazardous materials?
No MSDS. No hazardous material.
What is the ESD classification of nsn 5310011783981?
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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