Model: MIL-B-3990

Needle Roller Bearing

Properties:

Bore Diameter
Between 0.4993 inches and 0.5000 inches
Overall Outside Diameter
Between 1.3115 inches and 1.3135 inches
Lubrication Material
Grease
Outer Ring Width
Between 0.4850 inches and 0.5000 inches
Inner Ring Width
Between 0.6150 inches and 0.6250 inches
Crown Radius
10.0000 inches
Surface Finish
Ground
Seal Quantity
2
Bearing Seal Type
Contact
Alignment Type
Self-aligning
Self-alignment Location
External
Features Provided
Lubrication hole and lubrication groove
Lubrication Material Specification
Mil-g-81322 military specification single material response
Material
Plastic acetal seal or plastic polyhexamethylene adipamide seal
Material
Steel comp e50100 inner ring or steel comp e51100 inner ring or steel comp e52100 inner ring or steel comp 4615 inner ring or steel comp 4617 inner ring or steel comp 4620 inner ring
Material
Steel comp e50100 outer ring or steel comp e51100 outer ring or steel comp e52100 outer ring or steel comp 4615 outer ring or steel comp 4617 outer ring or steel comp 4620 outer ring
Material
Steel comp e50100 retaining plate or steel comp e51100 retaining plate or steel comp e52100 retaining plate or steel comp 4615 retaining plate or steel comp 4617 retaining plate or steel comp 4620 retaining plate
Material Specification
L-p-392 federal specification 1st material response seal or l-p-410, type 6/6 federal specification 2nd material response seal
Surface Treatment
Chromium outer ring
Surface Treatment
Cadmium inner ring or oxide inner ring
Surface Treatment
Cadmium retaining plate or oxide retaining plate
Surface Treatment Specification
Qq-c-320 federal specification single treatment response outer ring
Surface Treatment Specification
Qq-p-416, type 1, class 2 federal specification 1st treatment response inner ring or mil-c-13924 military specification 2nd treatment response inner ring
Surface Treatment Specification
Qq-p-416, type 1, class 2 federal specification 1st treatment response retaining plate or mil-c-13924 military specification 2nd treatment response retaining plate
Style Designator
Track roller
NSN
3110-01-256-9277
Part Number
MIL-B-3990
Description
Bearing,roller,needle
CAGE
81349

A single or multiple-row antifriction bearing used with or without inner or outer races characterized by relatively small size rollers usually not ranging above 0.250 inch (6.35mm) diameter and generally longer in length in relation to diameter.

Part MIL-B-3990 NSN 3110-01-256-9277

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
00051
FIIG:
A044A0
Concept No.:
App. Key:
M
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:
CRITL:
X

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:
114800
UFC:
58850
LTL:
RATING VARIABLE
LCL:
--
WCC:
742
TCC:
Z
SHC:
9
ACC:
Trailers/Vehicles

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Schedule B and Export
  • Schedule B: 8482400000
  • SITC: 74640
  • End Use: Industrial machines, other
  • NAICS: 332991
  • USDA: 1

Freight Class: Needle roller bearings

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