Model: 4X181C1

Externally Relieved Body Bolt

Properties:

Thread Class
3a
Thread Direction
Right-hand
Thread Length
Between 0.656 inches and 0.718 inches
Fastener Length
Between 1.094 inches and 1.156 inches
Head Style
Square
Head Height
Between 0.155 inches and 0.160 inches
Width Between Flats
Between 1.094 inches and 1.156 inches
First Diameter From Head
Between 0.620 inches and 0.625 inches
Second Diameter From Head
Between 0.499 inches and 0.501 inches
Distance From Largest Bearing Surface Of Head To End Of First Diameter
Between 0.219 inches and 0.281 inches
Distance From Largest Bearing Surface Of Head To End Of Second Diameter
Between 0.313 inches and 0.385 inches
Thread Diameter
0.625 inches
Thready Qty Per Inch (tpi)
18
Hardness Rating
30.0 rockwell c and 34.0 rockwell c
Externally Relieved Body Diameter Quantity
2
Material
Steel
Surface Treatment
Cadmium
Thread Series Designator
Unf
NSN
5306-00-251-2181
Part Number
4X181C1
Description
Bolt,externally Relieved Body
CAGE
98296

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 undercuts for thread relief). It is no. 10 (0.190 in.) (5 mm) or larger in size and has a head which is not designed to be held or driven with an inserted driver or designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. Excludes bolt, internal wrenching and thumbscrew. See also screw, externally relieved body.

Part 4X181C1 NSN 5306-00-251-2181

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
06675
FIIG:
A003B0
Concept No.:
App. Key:
BF
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

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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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