Model: 31FC918

Hexagon Self-locking Nut

Properties:

Thread Class
3b
Thread Direction
Right-hand
Locking Feature
Free-running all metal design
Nut Style
Hexagon
Nut Height
0.688 inches
Width Across Flats
0.875 inches
Tempurature Rating
550.0 degrees fahrenheit
Thread Series
Unf
Thready Qty Per Inch (tpi)
18
Thread Size
0.562 inches
Material
Steel
Surface Treatment
Cadmium or zinc
Surface Treatment Specification
An-p-61 federal standard single treatment response or mil-p-688, type 1 military specification single treatment response
NSN
5310-00-274-9405
Part Number
31FC918
Description
Nut,self-locking,hexagon
CAGE
56878

A nut having a flat bottom and 6 sides. An integral feature is incorporated for locking on the threads of a mating member. Excludes nut (1), self-locking, cap.

Part 31FC918 NSN 5310-00-274-9405

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
05277
FIIG:
A021A0
Concept No.:
1
App. Key:
BK
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: 7318160000
  • SITC: 69421
  • End Use: Finished metal shapes
  • NAICS: 332722
  • USDA: 1

Freight Class: Nuts of iron or steel

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