Model: 4B21MS4-012

Sleeve Bushing

Properties:

Overall Length
Between 0.3700 inches and 0.3750 inches
Body Outside Diameter
Between 0.3730 inches and 0.3735 inches
Body Inside Diameter
Between 0.2495 inches and 0.2505 inches
Corner Shape
Square all corners
Surface Finish
125.0 microinches left end surface of body
Surface Finish
125.0 microinches right end surface of body
Surface Finish
16.0 microinches outside diameter surface of body
Surface Finish
250.0 microinches inside diameter surface of body
Material
Steel comp 4130
Surface Treatment
Chromium outside diameter surface of body
Surface Treatment Specification
Qq-c-320, cl 2 federal specification single treatment response outside diameter surface of body
Style Designator
17c solid, plain, no outside flanges
Style Designator
Solid, plain, no outside flanges
Test Data Document
81349-mil-i-6868 specification (includes engineering type bulletins, brochures, etc., that reflect specification type data in specification format; excludes commercial catalogs, industry directories, and similar trade publications, reflecting general type data on certain environmental and performance requirements and test conditions that are shown as "typical", "average", "", etc.).
Specification Data
43999-ld137-0018 manufacturers specification
NSN
3120-00-288-5184
Part Number
4B21MS4-012
Description
Bushing,sleeve
CAGE
43999

A tubular shaped unthreaded item with or without a flange at one end designed to be inserted into a hole to reduce the inside diameter of the hole and to protect the surrounding body structure from damage resulting from stress, strain, and/or vibration. The overall length must exceed 25 percent of the outside diameter or the shortest distance between peripheral flats of the body. Includes items which are divided into two or more segments which includes 180 degrees (3.141 radians) or less of the bearing periphery. For items made of rubber, see bushing, nonmetallic. See also bearing, sleeve; bushing, tapered; spacer, sleeve; insulator, bushing; and bushing, electrical conductor. Excludes bushing, drill, jig.

Part 4B21MS4-012 NSN 3120-00-288-5184

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
13206
FIIG:
A045A0
Concept No.:
App. Key:
K
Cond. Code:
2
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

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
114850
UFC:
58880
LTL:
70.0
LCL:
--
WCC:
742
TCC:
Z
SHC:
5
ACC:
Trailers/Vehicles

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Schedule B and Export
  • Schedule B: 8482997060
  • SITC: 74699
  • End Use: Industrial machines, other
  • NAICS: 332991
  • USDA: 1

Freight Class: Parts, nesoi, for cylindrical roller bearings, nesoi

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