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NSN 5305-00-149-9937

High Torque Screw

About this product

Between 2.079 inches and 2.125 inches fastener length, flat countersunk head style, between 0.880 inches and 0.890 inches head diameter, grip diameter: between 0.4358 inches and 0.4367 inches .

Manufacturer part number NAS337-20 for national stock number 5305001499937.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-00-149-9937.

  • MPN or Model

    NAS337-20

  • Schedule B
    7318.15.2000 (Bolts and bolts and their nuts or washers exported in the same shipment)
  • NMF (National Motor Freight)
    096640 - Screws, Iron Or Steel
  • Thread Class
    3a
  • Thread Direction
    Right-hand
  • Thread Length
    Between 0.641 inches and 0.687 inches
  • Fastener Length
    Between 2.079 inches and 2.125 inches
  • Head Style
    Flat countersunk
  • Head Diameter
    Between 0.880 inches and 0.890 inches
  • Grip Diameter
    Between 0.4358 inches and 0.4367 inches
  • Shank Unthreaded Hole Diameter
    0.106 inches first hole
  • Internal Drive Style
    Hexagon
  • Thread Diameter
    0.437 inches
  • Grip Length
    1.438 inches
  • Width Across Flats
    Between 0.313 inches and 0.316 inches
  • Thready Qty Per Inch (tpi)
    20
  • Min. Tensile Strength (psi)
    160000 pounds per square inch
  • Hardness Rating
    36.0 rockwell c and 40.0 rockwell c
  • Countersink Angle
    100.0 degrees
  • Distance From Head Largest Bearing Surface To Shank Hole Center
    1.922 inches first hole
  • Part Name Assigned By Controlling Agency
    Navy special project
  • Material
    Steel comp 4140 or steel comp e4340 or steel comp 6150 or steel comp 8735 or steel comp 8740
  • Material Specification
    Mil-s-5626 military specification 1st material response or mil-s-5000 military specification 2nd material response or mil-s-8503 military specification 3rd material response or mil-s-6098 military specification 4th material response or mil-s-6049 military specification 5th material response
  • Surface Treatment
    Cadmium and chromate
  • Surface Treatment Specification
    Qq-p-416, type 2 cl 3 federal specification single treatment response threads
  • Thread Series Designator
    Unf
  • Specification Data
    80205-nas337 professional/industrial association standard
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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 5305001499937

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
NAS337-20 National Aerospace Standards
NAS337-20 National Aerospace Standards
NAS337-20 National Aerospace Standards
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