Model: K39781-4

Convex Washer

Special Features:

Spherical radius 0.290 in. Min 0.310 in. Ma, countersink diameter 0.332 in. Min 0.342 in. Max, countersink depth 0.025 in., recess angle 89 degrees min 91 degrees max

Properties:

Hole Diameter
Between 0.260 inches and 0.270 inches
Outside Diameter
Between 0.454 inches and 0.464 inches
Material Thickness
Between 0.075 inches and 0.095 inches
Hardness Rating
Between 40.0 rockwell c and 46.0 rockwell c
Surface Finish
32.0 microinches all surfaces
Material
Steel comp 8740 or steel comp 4130
Material Specification
Mil-s-6049 military specification 1st material response or mil-s-6758 military specification 2nd material response or mil-s-18729 military specification 2nd material response
Surface Treatment
Cadmium and chromate
Surface Treatment Specification
Qq-p-416, type 2, cl 3 federal specification single treatment response
Style Designator
Convex
NSN
5310-01-360-2208
Part Number
K39781-4
Description
Washer,convex
CAGE
15653

A washer which is round with a centrally located hole. One bearing surface is smooth, flat, and unbroken, the other bearing surface is smooth, unbroken, and is raised to form a curved or spherical contour. See also washer (1), concave. Excludes bearing, washer thrust.

Part K39781-4 NSN 5310-01-360-2208

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
15931
FIIG:
A022B0
Concept No.:
1
App. Key:
A
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:
A
ESD:
ESD:
MMAC:
SX
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
0.1000lbs
Item Weight:
--
Item Dim:
--
OPI
SPI No.
SPI Rev.
SPC Mkg.
LVL A
LVL B
OPI:
O
SPI No.:
SPI Rev.:
SPC Mkg:
00
LVL_A:
E
LVL_B:

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
093486
UFC:
48950
LTL:
RATING VARIABLE
LCL:
--
WCC:
576
TCC:
Z
SHC:
9
ACC:
Construction Materials

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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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