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NSN 5305-01-348-2686

High Torque Screw

About this product

Between 2.078 inches and 2.124 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 AN178C20A for national stock number 5305013482686.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-01-348-2686.

  • MPN or Model

    AN178C20A

  • 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.)
    0.1 lb
  • Thread Class
    3a
  • Thread Direction
    Right-hand
  • Thread Length
    0.781 inches
  • Fastener Length
    Between 2.078 inches and 2.124 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
  • Grip Diameter
    Between 0.4986 inches and 0.4991 inches
  • Internal Drive Style
    Cross recess type 1
  • Thread Diameter
    0.500 inches
  • Grip Length
    Between 1.952 inches and 1.982 inches
  • 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
  • Surface Finish
    32.0 microinches bearing surface of head32.0 microinches grip
  • Material
    Steel comp 431
  • Material Specification
    Mil-s-18732 military specification single material response
  • Surface Treatment
    Passivate
  • Thread Series Designator
    Unf
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Close Tolerance Screw

A screw, machine or screw, cap, socket head whose unthreaded portion is of specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001 in.) (0.025 mm) or less of a specific diameter for items (1.000 in.) (25 mm) or less in diameter. Items over (1.000 in.) (25 mm) in diameter shall have a tolerance of fifteen ten thousandths (0.0015 in.) (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001 in.) (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 designed to be held or driven with an inserted driver. It is not designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads.

Mechanic Bill explains High Torque Screw

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NSN 5305013482686

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
AN178C20A Aeronautical Standards Group
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