Model: 181659

Hexagon Head Cap Screw

Properties:

Thread Class
2a
Thread Direction
Right-hand
Thread Length
Between 0.719 inches and 0.750 inches
Fastener Length
Between 0.719 inches and 0.750 inches
Head Style
Hexagon
Head Height
Between 0.272 inches and 0.291 inches
Width Between Flats
Between 0.612 inches and 0.625 inches
Thread Diameter
0.438 inches
Thready Qty Per Inch (tpi)
20
Min. Tensile Strength (psi)
90000 pounds per square inch
Hardness Rating
90.0 rockwell b and 21.7 rockwell c
Material
Steel
Material Specification
Astm a449, grade 5 assn standard single material response
Surface Treatment
Cadmium and chromate or zinc and chromate
Surface Treatment Specification
Qq-p-416, type 2, class 3 federal specification 1st treatment response or astm b633, type 2, class 3 assn standard 2nd treatment response
Thread Series Designator
Unf
Specification Data
81348-ff-s-85 government specification and 96906-ms35298/canceled/ government standard
Nondefinitive Specification/std Data
2 type and 10p style and 5 grade and 7/16unf size
NSN
5305-00-018-1659
Part Number
181659
Description
Screw,cap,hexagon Head
CAGE
7X677

An externally threaded fastener designed for insertion into holes in assembled parts, for mating with a preformed internal thread and for tightening or releasing by torquing the head. the threaded and unthreaded portions are both of the same nominal diameter of 0.190 inch (5 mm) or larger. head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. the thread length being the controlled dimension, the grip length is not specified. a locking feature may be incorporated in the design of the head or threads. the head is not designed to be held or driven with an inserted driver or by the thumb and fingers. excludes bolt,machine; bolt,externally relieved body; bolt,internal wrenching; and screw,cap,socket head.

Part 181659 NSN 5305-00-018-1659

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
18257
FIIG:
A003B0
Concept No.:
App. Key:
SB
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:
CRITL:
X

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
093486
UFC:
48950
LTL:
RATING VARIABLE
LCL:
50.0
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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