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NSN 5305-00-326-4379

High Torque Screw

About this product

Between 2.598 inches and 2.628 inches fastener length, flat countersunk head style, between 0.605 inches and 0.674 inches head diameter, grip diameter: between 0.4360 inches and 0.4370 inches .

Manufacturer part number NAS1581A7H31 for national stock number 5305003264379.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-00-326-4379.

  • MPN or Model

    NAS1581A7H31

  • 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)
  • Thread Class
    3a
  • Thread Direction
    Right-hand
  • Thread Length
    Between 0.650 inches and 0.700 inches
  • Fastener Length
    Between 2.598 inches and 2.628 inches
  • Head Style
    Flat countersunk
  • Head Diameter
    Between 0.605 inches and 0.674 inches
  • Grip Diameter
    Between 0.4360 inches and 0.4370 inches
  • Internal Drive Style
    High-torque
  • Thread Diameter
    0.438 inches
  • Grip Length
    Between 1.928 inches and 1.948 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
    Between 99.0 degrees and 101.0 degrees
  • Surface Finish
    32.0 microinches threads
  • 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 2 federal specification single treatment response
  • Thread Series Designator
    Unjf
  • Specification Data
    80205-nas1581 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 5305003264379

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
NAS1581A7H31 National Aerospace Standards
NAS1581A7H31T National Aerospace Standards
NAS1581A7H31 National Aerospace Standards
NAS1581A7H31 National Aerospace Standards
NAS1581A7H31T National Aerospace Standards
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