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NSN 5306-01-478-4738

Close Tolerance Hex Head Bolt

About this product

Between 2.098 inches and 2.128 inches fastener length, hexagon head style, between 0.125 inches and 0.140 inches head height, width between flats: between 0.430 inches and 0.439 inches .

Manufacturer part number ST3M731-4D27 for national stock number 5306014784738.

Datasheet

  • Product description

    Close Tolerance Bolt NSN 5306-01-478-4738.

  • MPN or Model

    ST3M731-4D27

  • Schedule B
    8109.90.0000 (Zirconium and articles thereof nesoi)
  • Thread Class
    3a
  • Thread Direction
    Right-hand
  • Thread Length
    0.425 inches
  • Fastener Length
    Between 2.098 inches and 2.128 inches
  • Head Style
    Hexagon
  • Head Height
    Between 0.125 inches and 0.140 inches
  • Width Between Flats
    Between 0.430 inches and 0.439 inches
  • Grip Diameter
    Between 0.2485 inches and 0.2495 inches
  • Shank Unthreaded Hole Diameter
    0.076 inches first hole and 0.086 inches first hole
  • End Application
    Af/a-18a and af/a-18b aircraft landing gear system
  • Thread Diameter
    0.250 inches
  • Grip Length
    Between 1.678 inches and 1.698 inches
  • Features Provided
    Finished head
  • Thready Qty Per Inch (tpi)
    28
  • Distance From Head Largest Bearing Surface To Shank Hole Center
    1.932 inches first hole
  • Surface Finish
    63.0 microinches grip
  • Part Name Assigned By Controlling Agency
    Ivd coated titanium hexagon head bolt
  • Material
    Titanium alloy
  • Material Specification
    Ams4697, comp 6al-4v assn standard single material response
  • Surface Treatment
    Aluminum
  • Surface Treatment Specification
    Mil-c-83488, type 2, cl 3 military specification single treatment response
  • Thread Series Designator
    Unjf
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Close Tolerance Bolt

An externally threaded fastener whose unthreaded portion is of a specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001) of an inch (0.025 mm) or less of a specific diameter for items one inch (25 mm) or less in diameter. Items over one inch (25 mm) in diameter shall have a tolerance of fifteen ten-thousandths (0.0015) of an inch (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001) of an inch (0.025 mm) below the minimum shank diameter, but not below the minimum major diameter for applicable class of fit, as shown in the screw thread standards, fed std h28 and/or other nationally recognized standards. The head is not designed to be held or driven with an inserted driver, nor is it designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. For items having close tolerance, and fabricated from material having 160,000 pounds per square inch (1100 megapascals) minimum tensile strength, see bolt, shear. For items fabricated from material having less than 160,000 pounds per square inch (1100 megapascals) minimum tensile strength and not having a close tolerance, see bolt, machine.

Mechanic Bill explains Close Tolerance Hex Head Bolt

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NSN 5306014784738

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
ST3M731-4D27 Boeing Company, The
VS3207-4-27D Alcoa Global Fasteners, Inc.
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