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Recessed Washer NSN 5310-00-498-1256

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 5310-00-498-1256 NSN: 5310-00-498-1256

Features and Characteristics

Hole Diameter
0.390 inches
Outside Diameter
1.000 inches
Recess Depth
Between 0.030 inches and 0.040 inches
Material Thickness
Between 0.122 inches and 0.123 inches
Min. Tensile Strength (psi)
150000 pounds per square inch
Hardness Rating
Between 34.0 rockwell c and 38.0 rockwell c
Bottom Recess Angle
90.0 degrees
Top Recess Angle
90.0 degrees
Surface Finish
90.0 microinches all surfaces
Special Features
Used on h-3
Material
Steel comp 4340
Surface Treatment
Cadmium
Surface Treatment Specification
Qq-p-416, type 2, cl 2 federal specification single treatment response
Style Designator
Recessed both sides
FSC
5310 Nuts And Washers
NIIN
004981256
NSN
5310004981256

Manufacturer Part Numbers

Part numbers registered to this national stock number.
Part Number
Cage
Status
MSDS
Part Number:
S6137-64383-101
Cage Code:
78286
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 5310-00-498-1256
What are the manufacturers of nsn 5310004981256?
Does this nsn 5310004981256 have a shelf life?
No. This NSN does not have an applicable shelf life.
What is the formal definition of nsn 5310004981256
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 5310004981256 contain any precious metals?
Precious metal content is unknown.
Does nsn 5310004981256 contain any hazardous materials?
No MSDS. No hazardous material.
What is the ESD classification of nsn 5310004981256?
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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