Model: KFN556-3

Extended Washer Self-locking Nut

Special Features:

Cetyl alcohol lubricant per mil-l-87132, type 1, grade a

Properties:

Thread Class
3b
Thread Direction
Right-hand
Locking Feature
Prevailing torque all metal design
Washer Outside Diameter
0.348 inches
Overall Height
0.301 inches
Nut Style
Hexagon
Washer Thickness
Between 0.088 inches and 0.092 inches
Width Across Flats
Between 0.243 inches and 0.251 inches
Thread Series
Unjf
Thready Qty Per Inch (tpi)
32
Hardness Rating
Between 39.0 rockwell c and 43.0 rockwell c
Thread Size
0.190 inches
Material
Plastic polytetrafluoroethylene washer
Material
Steel comp 8740 nut or steel comp e4340 nut
Material Specification
Mil-p-19468 military specification single material response washer
Material Specification
Mil-s-6049 military specification 1st material response nut or mil-s-5000 military specification 2nd material response nut
Surface Treatment
Cadmium nut and chromate nut
Surface Treatment Specification
Qq-p-416, type 2, cl 2 federal specification single treatment response nut
NSN
5310-01-223-6531
Part Number
KFN556-3
Description
Nut,self-locking,extended Washer
CAGE
17446

A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery. An integral feature is incorporated for locking on the threads of a mating member.

Part KFN556-3 NSN 5310-01-223-6531

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
29730
FIIG:
A021A0
Concept No.:
1
App. Key:
BT
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:
Q

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
093486
UFC:
48950
LTL:
RATING VARIABLE
LCL:
--
WCC:
573
TCC:
Z
SHC:
9
ACC:
Construction Materials

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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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