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NSN 5305-00-003-6868

High Torque Screw

About this product

Between 0.448 inches and 0.495 inches fastener length, flat countersunk head style, between 0.256 inches and 0.261 inches head diameter, grip diameter: between 0.1625 inches and 0.1635 inches .

Manufacturer part number 51B581-2-3 for national stock number 5305000036868.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-00-003-6868.

  • MPN or Model

    51B581-2-3

  • 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 0.162 inches and 0.229 inches
  • Fastener Length
    Between 0.448 inches and 0.495 inches
  • Head Style
    Flat countersunk
  • Head Diameter
    Between 0.256 inches and 0.261 inches
  • Grip Diameter
    Between 0.1625 inches and 0.1635 inches
  • Internal Drive Style
    Offset cruciform (torque set)
  • Thread Diameter
    0.164 inches
  • Grip Length
    Between 0.266 inches and 0.286 inches
  • Thready Qty Per Inch (tpi)
    32
  • Min. Tensile Strength (psi)
    180000 pounds per square inch
  • Hardness Rating
    39.0 rockwell c and 43.0 rockwell c
  • Countersink Angle
    Between 99.5 degrees and 100.5 degrees
  • Surface Finish
    32.0 microinches grip
  • Material
    Steel comp e4340 or steel comp 4340 or steel comp 4140 or steel comp 8740
  • Surface Treatment
    Cadmium and chromate
  • Surface Treatment Specification
    Qq-p-416, type 2, cl 2 federal specification single treatment response
  • Thread Series Designator
    Unjc
  • Specification Data
    76823-51b581 manufacturers 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 5305000036868

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
51B581-2-3 Northrop Grumman Technical Services,
51B581-2-3 Northrop Grumman Systems Corporation
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