Model: K21B

Airframe Ball Bearing
Description:

1.3130 inches bore diameter, 2.0625 inches overall outside diameter, grease lubrication material, 0.3750 inches outer ring width.

Special Features:

W80 pct.Full of mil-g-81322, heat treat rings and balls to rockwell c 60 to 66 and stabilized for operation at 250 deg. F, radial and lateral eccentricity, inner ring 0.0010 in. Outer ring 0.0016 in., 0.0003-0.0010 in. Radial clearance

Properties:

Bore Diameter
1.3130 inches
Overall Outside Diameter
2.0625 inches
Lubrication Material
Grease
Outer Ring Width
0.3750 inches
Inner Ring Width
0.4370 inches
Seal Quantity
2
Bearing Seal Type
Contact
Load Direction
Radial
Standard Tolerance Designation
Afbma standard tolerance for airframe ball bearings
Lubrication Material Specification
Mil-g-81322 military specification single material response
Material
Plastic polytetrafluoroethylene seal
Material
Steel comp e51100 ball or steel comp e52100 ball
Material
Steel comp e52100 inner ring
Material
Steel comp e52100 outer ring
Material
Stainless steel retainer
Material
Steel comp e51100 or steel comp e52100 ball
Material Specification
66 federal standard all material responses ball
Material Specification
66 federal standard single material response inner ring
Material Specification
66 federal standard single material response outer ring
Material Specification
Ams 3652 assn standard single material response seal or ams 3666 assn standard single material response seal
Material Specification
Ams 3652 assn standard single material response or ams 3666 assn standard single material response seal
Surface Treatment
Cadmium exposed surfaces as mounted
Surface Treatment Specification
Qq-p-416, type 1, cl 2 federal specification single treatment response exposed surfaces as mounted
Style Designator
Single row inner ring extended both sides
NSN
3110-00-042-0444
Part Number
K21B
Description
Bearing,ball,airframe
CAGE
38443

A cylindrical item in which the inner or outer ring turns upon row(s) of hardened ball, bearing which roll on a raceway, thus minimizing friction. These items are characterized by their noncorrosive qualities, lightness of weight, inch dimensions rather than metric, inner rings generally projecting beyond the faces of the outer ring, or a very narrow width inner ring having an outside diameter slightly larger than the bore diameter. Designed primarily for use in aircraft assemblies, such as control systems and surfaces of aircraft. Excludes bearing, ball, annular.

Part K21B NSN 3110-00-042-0444

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
00041
FIIG:
A044A0
Concept No.:
App. Key:
B
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:
F

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
0.2000lbs
Item Weight:
--
Item Dim:
--
OPI
SPI No.
SPI Rev.
SPC Mkg.
LVL A
LVL B
OPI:
M
SPI No.:
SPI Rev.:
SPC Mkg:
51
LVL_A:
E
LVL_B:
Q

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
114820
UFC:
58860
LTL:
77.5
LCL:
--
WCC:
742
TCC:
Z
SHC:
9
ACC:
Trailers/Vehicles

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Schedule B and Export
  • Schedule B: 8482105068
  • SITC: 74610
  • End Use: Industrial machines, other
  • NAICS: 332991
  • USDA: 1

Freight Class: Ball bearings, nesoi

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