Model: C20813-4-2

Plate Self-locking Nut

Special Features:

Nut, plate-cap height .825 + or -.010, cap o.D. .550 + or -.010, base plate top lt corner to rt side lower corner 1.05 + or -.010

Properties:

Thread Class
3b
Thread Direction
Right-hand
Locking Feature
Prevailing torque all metal design
Nut Style
Plate
Nut Length
Between 1.027 inches and 1.047 inches
Nut Height
Between 0.500 inches and 0.520 inches
Plate Thickness
Between 0.050 inches and 0.070 inches
Plate Width
Between 0.797 inches and 0.817 inches
Nut Counterbore Depth
0.115 inches nut and 0.135 inches nut
Thread Series
Unjf
Thready Qty Per Inch (tpi)
28
Thread Size
0.250 inches
Material
Iron alloy 660 cap
Material
Nickel alloy 718 nut
Material Specification
Ams-5525 assn standard 1st material response cap or ams-5726 assn standard 2nd material response cap or ams-3731 assn standard 3rd material response cap or ams-5732 assn standard 4th material response cap or ams-5737 assn standard 5th material response cap
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
Surface Treatment
Passivate cap
Surface Treatment
Passivate nut
NSN
5310-01-485-7008
Part Number
C20813-4-2
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 C20813-4-2 NSN 5310-01-485-7008

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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