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NSN 5305-00-005-0624

High Torque Screw

About this product

Between 3.698 inches and 3.745 inches fastener length, pan head style, between 0.361 inches and 0.381 inches head diameter, head height: between 0.103 inches and 0.118 inches .

Manufacturer part number 51B221-55 for national stock number 5305000050624.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-00-005-0624.

  • MPN or Model

    51B221-55

  • 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 0.246 inches and 0.323 inches
  • Fastener Length
    Between 3.698 inches and 3.745 inches
  • Head Style
    Pan
  • Head Diameter
    Between 0.361 inches and 0.381 inches
  • Head Height
    Between 0.103 inches and 0.118 inches
  • Grip Diameter
    Between 0.1885 inches and 0.1895 inches
  • Internal Drive Style
    Offset cruciform (torque set)
  • Thread Diameter
    0.192 inches
  • Grip Length
    Between 3.422 inches and 3.452 inches
  • Thready Qty Per Inch (tpi)
    32
  • Min. Tensile Strength (psi)
    180000 pounds per square inch
  • Surface Finish
    32.0 microinches grip
  • 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 3 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 5305000050624

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
51B221-55 Northrop Grumman Technical Services,
51B221-55 Northrop Grumman Systems Corporation
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