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NSN 5305-01-501-6620

High Torque Screw

About this product

Between 2.424 inches and 2.454 inches fastener length, pan head style, between 0.597 inches and 0.612 inches head diameter, head height: between 0.176 inches and 0.183 inches .

Manufacturer part number NAS1578A5R31 for national stock number 5305015016620.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-01-501-6620.

  • MPN or Model

    NAS1578A5R31

  • 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
    0.501 inches
  • Fastener Length
    Between 2.424 inches and 2.454 inches
  • Head Style
    Pan
  • Head Diameter
    Between 0.597 inches and 0.612 inches
  • Head Height
    Between 0.176 inches and 0.183 inches
  • Grip Diameter
    Between 0.311 inches and 0.312 inches
  • Internal Drive Style
    Offset cruciform (torque set)
  • Thread Diameter
    0.312 inches
  • Grip Length
    Between 1.928 inches and 1.948 inches
  • Thready Qty Per Inch (tpi)
    24
  • Material
    Steel comp 4140 or steel comp 4340 or steel comp e4340 or steel comp 8740
  • Material Specification
    Mil-s-5626 military specification 1st material response or ams6415 assn standard 2nd material response or mil-s-5000 military specification 3rd material response or mil-s-6049 military specification 4th material response
  • Surface Treatment
    Cadmium
  • Thread Series Designator
    Unjf
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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 5305015016620

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
NAS1578A5R31 National Aerospace Standards
NAS1578A5R31 National Aerospace Standards
NAS1578A5R31 National Aerospace Standards
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