Model: 20-143

Externally Relieved Body Screw

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

Between 0.735 inches and 0.795 inches

Fastener Length

Between 3.110 inches and 3.140 inches

Head Style

Hexagon extended washer

Head Height

Between 0.160 inches and 0.178 inches

Width Between Flats

Between 0.245 inches and 0.250 inches

Extended Washer Diameter

Between 0.390 inches and 0.410 inches

Extended Washer Thickness

Between 0.015 inches and 0.202 inches

First Diameter From Head

Between 0.166 inches and 0.172 inches

Distance From Largest Bearing Surface Of Head To End Of First Diameter

Between 2.345 inches and 2.375 inches

Internal Drive Style

Slot

Thread Diameter

0.190 inches

Thready Qty Per Inch (tpi)

Min. Tensile Strength (psi)

90000 pounds per square inch

Externally Relieved Body Diameter Quantity

Material

Steel comp 1020

Material Specification

66 federal standard single material response

Surface Treatment

Chromate

Surface Treatment Specification

135410027 fscm 94990 mfr ref single treatment response

Thread Series Designator

Unf

NSN

5305-00-115-6250

Part Number

20-143

Description

Screw,externally Relieved Body

CAGE

1VPW8

An externally threaded fastener whose threaded portion is of one nominal diameter, and whose unthreaded portion has been machined or ground in one or more places or over its entire length to a maximum diameter less than the minimum pitch diameter of the thread (excludes undercut for thread relief). It is no. 0 (0.060 in.) (1.5 mm) or larger, and is designed to be held or driven with either a wrench or inserted driver (excluding internal socket and multiple spline types) or both in sizes below no. 10 (0.190 in.) (5 mm) and larger sizes must have a head designed for any type inserted driver (excluding internal socket and multiple spline types) but may also be designed for external wrenching. A locking feature may be incorporated in the design of the head or threads. See also bolt, externally relieved body and bolt, internal wrenching.

Part 20-143 NSN 5305-00-115-6250

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

01852

FIIG:

A003B0

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:

1.4000lbs

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:

093486

UFC:

48950

LTL:

RATING VARIABLE

LCL:

WCC:

713

TCC:

SHC:

ACC:

Construction Materials

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Schedule B and Export

Schedule B: 7318152000
SITC: 69421
End Use: Iron and steel products, other
NAICS: 332722
USDA: 1

Freight Class: Bolts and bolts and their nuts or washers exported in the same shipment