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NSN 5305-00-805-4253

High Torque Screw

About this product

Between 2.260 inches and 2.277 inches fastener length, button head style, 0.391 inches head diameter, head height: 0.109 inches .

Manufacturer part number 51B221-32H for national stock number 5305008054253.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-00-805-4253.

  • MPN or Model

    51B221-32H

  • 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 0.261 inches and 0.308 inches
  • Fastener Length
    Between 2.260 inches and 2.277 inches
  • Head Style
    Button
  • Head Diameter
    0.391 inches
  • Head Height
    0.109 inches
  • Grip Diameter
    Between 0.1885 inches and 0.1895 inches
  • Shank Unthreaded Hole Diameter
    0.070 inches first hole
  • Internal Drive Style
    Offset cruciform (torque set)
  • Thread Diameter
    0.190 inches
  • Grip Length
    Between 1.969 inches and 1.999 inches
  • Thready Qty Per Inch (tpi)
    32
  • Min. Tensile Strength (psi)
    180000 pounds per square inch
  • Distance From Head Largest Bearing Surface To Shank Hole Center
    0.117 inches first hole
  • Surface Finish
    32.0 microinches grip
  • Material
    Steel comp e4340 or steel comp 4140 or steel comp 8740 or steel comp 6150 or steel comp 8735
  • Surface Treatment
    Cadmium
  • Surface Treatment Specification
    Qq-p-416, type 1 federal specification single treatment response or qq-p-416, type 2 federal specification single treatment response
  • Thread Series Designator
    Unc
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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 5305008054253

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
51B221-32H Northrop Grumman Technical Services,
51B221-32H Northrop Grumman Systems Corporation
51B221-32H Sps Technologies, Llc
51B221-32H Sps Technologies, Llc
51B221-32H Hi-shear Corporation
51B221-32H Sps Technologies, Llc
51B221-32H Alcoa Global Fasteners, Inc.
51B221-32H Lisi Aerospace Canada Corp
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