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NSN 5305-00-766-5306

High Torque Screw

About this product

Between 0.978 inches and 0.983 inches fastener length, flat countersunk head style, between 0.390 inches and 0.395 inches head diameter, grip diameter: between 0.2485 inches and 0.2495 inches .

Manufacturer part number 51B581-4-11H for national stock number 5305007665306.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-00-766-5306.

  • MPN or Model

    51B581-4-11H

  • 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
    0.316 inches
  • Fastener Length
    Between 0.978 inches and 0.983 inches
  • Head Style
    Flat countersunk
  • Head Diameter
    Between 0.390 inches and 0.395 inches
  • Grip Diameter
    Between 0.2485 inches and 0.2495 inches
  • Shank Unthreaded Hole Diameter
    0.076 inches first hole
  • Internal Drive Style
    Offset cruciform (torque set)
  • Thread Diameter
    0.250 inches
  • Grip Length
    Between 0.678 inches and 0.698 inches
  • Thready Qty Per Inch (tpi)
    28
  • Min. Tensile Strength (psi)
    180000 pounds per square inch
  • Hardness Rating
    36.0 rockwell c and 40.0 rockwell c
  • Countersink Angle
    Between 99.5 degrees and 100.5 degrees
  • Distance From Head Largest Bearing Surface To Shank Hole Center
    0.862 inches first hole and 0.867 inches first hole
  • Surface Finish
    32.0 microinches grip
  • Material
    Steel comp 4140 or steel comp 4340 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-6049 military specification 3rd material response
  • Surface Treatment
    Cadmium
  • Surface Treatment Specification
    Qq-p-416 type 2 cl 2 federal specification single treatment response
  • 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 5305007665306

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
51B581-4-11H Northrop Grumman Technical Services,
51B581-4-11H Northrop Grumman Systems Corporation
51B581-4-11H Arconic Global Fasteners & Rings,
51B581-4-11H Sps Technologies, Llc
51B581-4-11H Sps Technologies, Llc
51B581-4-11H Hi-shear Corporation
51B581-4-11H Sps Technologies, Llc
51B581-4-11H Alcoa Global Fasteners, Inc.
51B581-4-11H Lisi Aerospace Canada Corp
51B581-4-11H Erwood Inc
51B581-4-11H Northrop Grumman Systems Corporation
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