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NSN 5306-00-251-2181

Externally Relieved Body Bolt

About this product

Between 1.094 inches and 1.156 inches fastener length, square head style, between 0.155 inches and 0.160 inches head height, width between flats: between 1.094 inches and 1.156 inches .

Manufacturer part number 4X181C1 for national stock number 5306002512181.

Datasheet

  • Product description

    Externally Relieved Body Bolt NSN 5306-00-251-2181.

  • MPN or Model

    4X181C1

  • Schedule B
    7318.15.2000 (Bolts and bolts and their nuts or washers exported in the same shipment)
  • 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
Externally Relieved Body Bolt

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.

Mechanic Bill explains Externally Relieved Body Bolt

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NSN 5306002512181

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
4X181C1 Standard Mfg Co Inc
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