Model: 20-143

Externally Relieved Body Screw

Properties:

Thread Class
2a
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)
32
Min. Tensile Strength (psi)
90000 pounds per square inch
Externally Relieved Body Diameter Quantity
1
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:
SE
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:
SX
CRITL:
X

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:
O
SPI No.:
SPI Rev.:
SPC Mkg:
00
LVL_A:
E
LVL_B:
Q

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
093486
UFC:
48950
LTL:
RATING VARIABLE
LCL:
--
WCC:
713
TCC:
Z
SHC:
9
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

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