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NSN 5305-01-368-7321

High Torque Screw

About this product

Between 1.700 inches and 1.730 inches fastener length, flat countersunk head style, between 0.464 inches and 0.507 inches head diameter, grip diameter: between 0.2485 inches and 0.2494 inches .

Manufacturer part number NAS1580A4T21 for national stock number 5305013687321.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-01-368-7321.

  • MPN or Model

    NAS1580A4T21

  • 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
    Between 0.378 inches and 0.428 inches
  • Fastener Length
    Between 1.700 inches and 1.730 inches
  • Head Style
    Flat countersunk
  • Head Diameter
    Between 0.464 inches and 0.507 inches
  • Grip Diameter
    Between 0.2485 inches and 0.2494 inches
  • Internal Drive Style
    Offset cruciform (torque set)
  • Thread Diameter
    0.250 inches
  • Grip Length
    Between 1.302 inches and 1.322 inches
  • Thready Qty Per Inch (tpi)
    28
  • 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
  • Surface Finish
    32.0 microinches grip
  • Material
    Steel comp 4140 or steel comp e4340 or steel comp 8740
  • Material Specification
    Mil-s-5626 military specification single material response or mil-s-5000 military specification 1st material response or mil-s-6049 military specification 2nd material response
  • Surface Treatment
    Cadmium and chromate
  • Surface Treatment Specification
    Qq-p-416 type 2 cl 2 federal specification single treatment response
  • Thread Series Designator
    Unjf
  • Specification Data
    80205-nas1580 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 5305013687321

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
NAS1580A4T21 National Aerospace Standards
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