Model: C20811-4-4

Plate Self-locking Nut

Properties:

Thread Class
3b
Thread Direction
Right-hand
Locking Feature
Prevailing torque all metal design
Counterbore Diameter
0.302 inches base and 0.322 inches base
Nut Style
Plate
Nut Length
Between 1.032 inches and 1.052 inches
Nut Height
Between 0.632 inches and 0.652 inches
Plate Thickness
Between 0.050 inches and 0.070 inches
Plate Width
Between 0.640 inches and 0.660 inches
Nut Counterbore Depth
0.240 inches nut and 0.260 inches nut
Thread Series
Unjf
Thready Qty Per Inch (tpi)
28
Thread Size
0.250 inches
Material
Iron alloy 660 base
Material
Nickel alloy 718 nut
Material
Steel comp 302 clip
Material Specification
Ams 5596 assn standard 1st material response nut or ams 5597 assn standard 2nd material response nut or ams 5662 assn standard 3rd material response nut or ams 5663 assn standard 4th material response nut or ams 5664 assn standard 5th material response nut
Material Specification
Ams 5525 assn standard single material response base
Material Specification
Ams 5688 assn standard 1st material response clip or ams 5866 assn standard 2nd material response clip
Surface Treatment
Passivate base
Surface Treatment
Passivate clip
Surface Treatment
Passivate nut
NSN
5310-01-485-8329
Part Number
C20811-4-4
Description
Nut,self-locking,plate
CAGE
81755

A nut with a flanged base of varied shapes which may be plain or mounted by rivets, bolts, welding or integral prongs. An integral feature is incorporated for locking on the threads of a mating member.

Part C20811-4-4 NSN 5310-01-485-8329

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
05280
FIIG:
A021A0
Concept No.:
1
App. Key:
BZ
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:
A
ESD:
A
MMAC:
CRITL:
X

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Schedule B and Export
  • Schedule B: 7508900000
  • SITC: 69975
  • End Use: Finished metal shapes
  • NAICS: 332999
  • USDA: 1

Freight Class: Other articles of nickel, nesoi (excluding cloth, grill & netting of nickel wire)

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