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Recessed Washer NSN 5310-00-818-0520

Item Description

A washer of any peripheral shape having a centrally located hole. Both bearing surfaces are parallel and flat, but one or both of the bearing surfaces must be broken by a counterbore, countersink, or similarly shaped recess. The thickness must not exceed 25 per cent of the outside diameter or the largest outside dimension. The maximum limit of the tolerance or range applied to the thickness and/or largest outside dimension must be used to determine compliance. Excludes washer, concave, retainer, packing, and thrust type washers. See also spacer, sleeve; and spacer, stepped.

NSN 5310-00-818-0520 NSN: 5310-00-818-0520

Features and Characteristics

Hole Diameter
Between 0.378 inches and 0.388 inches
Outside Diameter
0.750 inches
Recess Diameter
Between 0.483 inches and 0.495 inches
Material Thickness
0.080 inches
Hardness Rating
Between 33.0 rockwell c and 37.0 rockwell c
Recess Angle
90.0 degrees
Heat Treatment
As fabricated
Material
Steel comp 4130
Material Specification
Mil-s-18729 military specification single material response
Surface Treatment
Cadmium or passivate
Surface Treatment Specification
Mil-c-8837 type 2 cl 1 military specification 1st treatment response or qq-p-35 federal specification 2nd treatment response
Style Designator
Recessed
Test Data Document
81349-mil-i-6868 specification (includes engineering type bulletins, brochures, etc., that reflect specification type data in specification format; excludes commercial catalogs, industry directories, and similar trade publications, reflecting general type data on certain environmental and performance requirements and test conditions that are shown as "typical", "average", "", etc.).
FSC
5310 Nuts And Washers
NIIN
008180520
NSN
5310008180520

Manufacturer Part Numbers

Part numbers registered to this national stock number.
Part Number
Cage
Status
MSDS
Part Number:
A51B21014-11
Cage Code:
61174
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 5310-00-818-0520
What are the manufacturers of nsn 5310008180520?
Does this nsn 5310008180520 have a shelf life?
No. This NSN does not have an applicable shelf life.
What is the formal definition of nsn 5310008180520
A washer of any peripheral shape having a centrally located hole. both bearing surfaces are parallel and flat, but one or both of the bearing surfaces must be broken by a counterbore, countersink, or similarly shaped recess. the thickness must not exceed 25 per cent of the outside diameter or the largest outside dimension. the maximum limit of the tolerance or range applied to the thickness and/or largest outside dimension must be used to determine compliance. excludes washer, concave, retainer, packing, and thrust type washers. see also spacer, sleeve; and spacer, stepped.
Does nsn 5310008180520 contain any precious metals?
Precious metal content is unknown.
Does nsn 5310008180520 contain any hazardous materials?
No MSDS. No hazardous material.
What is the ESD classification of nsn 5310008180520?
No known electrostatic discharge.

Identification Group

Item Identification Guide (IIG) and Item Name Code (INC)
INC
FIIG
App. Key
Cond. Code
Status
INC:
15933
FIIG:
A022B0
App. Key:
A
Cond. Code:
1
Status:
A

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