Model: 4B21MS4-108

Sleeve Bushing

Properties:

Overall Length

Between 1.2450 inches and 1.2500 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

16.0 microinches outside diameter surface of body

Material

Steel comp 4130 or steel comp 4135

Material Specification

Mil-t-6736 military specification 1st material response or ams6371 assn standard 2nd material response or mil-t-6735 military specification 2nd material response

Surface Treatment

Chromium outside diameter surface of body

Surface Treatment Specification

Qq-c-320, class 2 federal specification single treatment response outside diameter surface of body

Style Designator

17c solid, plain, no outside flanges

Specification Data

43999-ld137-0018 manufacturers standard

NSN

3120-01-286-0910

Part Number

4B21MS4-108

Description

Bushing,sleeve

CAGE

89372

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 4B21MS4-108 NSN 3120-01-286-0910

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

13206

FIIG:

A045A0

Concept No.:

App. Key:

Cond. Code:

Status:

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators

HMIC

PMIC

ESD/EMI

ENAC

MMAC

CRITL

HMIC:

PMIC:

ESD:

MMAC:

CRITL:

Packaging & Shipping

Est. Pack Size

Est. Pack Weight

Est. Item Weight

Est. Item Dim.

Pack Size:

Paclk Weight:

Item Weight:

Item Dim:

OPI

SPI No.

SPI Rev.

SPC Mkg.

LVL A

LVL B

OPI:

SPI No.:

SPI Rev.:

SPC Mkg:

LVL_A:

LVL_B:

Freight Classification

NMFC

UFC

LTL

LCL

WCC

TCC

SHC

ACC

NMFC:

114850

UFC:

58880

LTL:

70.0

LCL:

WCC:

742

TCC:

SHC:

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