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Recessed Washer NSN 5310-01-178-7420

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 5310-01-178-7420 NSN: 5310-01-178-7420

Features and Characteristics

Hole Diameter
Between 0.490 inches and 0.500 inches
Outside Diameter
0.875 inches
Recess Diameter
Between 0.520 inches and 0.540 inches
Material Thickness
Between 0.026 inches and 0.030 inches
Recess Angle
90.0 degrees
Material
Steel
Material Specification
Ds186-d87 bs1449-321s12, fscm k1037 mfr ref single material response or ds186-d87 bs970-321s12, fscm k1037 mfr ref single material response
Style Designator
15 recessed
FSC
5310 Nuts And Washers
NIIN
011787420
NSN
5310011787420

Manufacturer Part Numbers

Part numbers registered to this national stock number.
Part Number
Cage
Status
MSDS
Part Number:
AHO88255
Cage Code:
K1037
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 5310-01-178-7420
What are the manufacturers of nsn 5310011787420?
Does this nsn 5310011787420 have a shelf life?
No. This NSN does not have an applicable shelf life.
What is the formal definition of nsn 5310011787420
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 5310011787420 contain any precious metals?
No precious metal content.
Does nsn 5310011787420 contain any hazardous materials?
No MSDS. No hazardous material.
What is the ESD classification of nsn 5310011787420?
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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