Model: 305259

Flat Washer
Description:

Rectangular cross-sectional shape style, 0.218 inches hole diameter, round peripheral shape style, 1 round center hole shape style.

Properties:

Cross Sectional Shape
Rectangular
Hole Diameter
0.218 inches
Edge Shape
Round
Center Hole Shape
1 round
Center Hole Shape
Round
Thickness
0.049 inches
Overall Diameter
0.500 inches
Material
Steel comp 1010
Material Specification
Qq-s-634 federal specification single material response
Surface Treatment
Cadmium or zinc
Nondefinitive Specification/std Data
A type
Departure From Cited Document
As mod by surf
NSN
5310-00-012-0391
Part Number
305259
Description
Washer,flat
CAGE

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.

Part 305259 NSN 5310-00-012-0391

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
13393
FIIG:
A022B0
Concept No.:
1
App. Key:
B
Cond. Code:
1
Status:
A

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators
HMIC
PMIC
ESD/EMI
ENAC
MMAC
CRITL
HMIC:
N
PMIC:
U
ESD:
ESD:
MMAC:
CRITL:
X

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Schedule B and Export
  • Schedule B: 7318220000
  • SITC: 69422
  • End Use: Finished metal shapes
  • NAICS: 332722
  • USDA: 1

Freight Class: Washers other than lock washers, iron or steel

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