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NSN 5306-00-275-9558

Close Tolerance Hex Head Bolt

About this product

Between 2.078 inches and 2.125 inches fastener length, hexagon head style, between 0.265 inches and 0.297 inches head height, width between flats: between 0.740 inches and 0.752 inches .

Manufacturer part number AN178H20 for national stock number 5306002759558.

Datasheet

  • Product description

    Close Tolerance Bolt NSN 5306-00-275-9558.

  • MPN or Model

    AN178H20

  • Schedule B
    7318.15.2000 (Bolts and bolts and their nuts or washers exported in the same shipment)
  • NMF (National Motor Freight)
    093486 - Bolts, Nuts Or Screws, NOI (sub 3)
  • Unit Weight (Est.)
    0.4 lb
  • Thread Class
    3a
  • Thread Direction
    Right-hand
  • Thread Length
    Between 0.750 inches and 0.829 inches
  • Fastener Length
    Between 2.078 inches and 2.125 inches
  • Head Style
    Hexagon
  • Head Height
    Between 0.265 inches and 0.297 inches
  • Width Between Flats
    Between 0.740 inches and 0.752 inches
  • Hole Diameter
    0.070 inches
  • Grip Diameter
    Between 0.4986 inches and 0.4991 inches
  • Shank Unthreaded Hole Diameter
    0.106 inches first hole and 0.116 inches first hole
  • Thread Diameter
    0.500 inches
  • Grip Length
    Between 1.296 inches and 1.328 inches
  • Hole Quantity
    1
  • Hole Type
    Drilled
  • Thready Qty Per Inch (tpi)
    20
  • Min. Tensile Strength (psi)
    125000 pounds per square inch
  • Hardness Rating
    26.0 rockwell c and 32.0 rockwell c
  • Hole Configuration Style
    Hexagon flats
  • Distance From Head Largest Bearing Surface To Shank Hole Center
    1.905 inches first hole and 1.937 inches first hole
  • Surface Finish
    63.0 microinches grip
  • Material
    Steel comp 8740 or steel comp 8630 or steel comp 8735 or steel comp 4037 or steel comp 4140 or steel comp 4130
  • Material Specification
    Mil-s-6049 military specification 1st material response or mil-s-6050 military specification 2nd material response or mil-s-6098 military specification 3rd material response or ams 6300 assn standard 4th material response or mil-s-5626 military specification 5th material response or mil-s-6758 military specification 6th material response
  • Surface Treatment
    Cadmium and chromate
  • Surface Treatment Specification
    Qq-p-416, type 2, class 3 federal specification single treatment response
  • Thread Series Designator
    Unf
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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 5306002759558

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
AN178H20 Aeronautical Standards Group
88T20 Department Of The Air Force
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