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NSN 5305-01-048-1141

High Torque Screw

About this product

Between 2.199 inches and 2.246 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 51B221-31 for national stock number 5305010481141.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-01-048-1141.

  • MPN or Model

    51B221-31

  • Schedule B
    7318.15.2000 (Bolts and bolts and their nuts or washers exported in the same shipment)
  • Thread Class
    3a
  • Thread Direction
    Right-hand
  • Thread Length
    Between 0.246 inches and 0.323 inches
  • Fastener Length
    Between 2.199 inches and 2.246 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 0.1185 inches and 0.1895 inches
  • Internal Drive Style
    Offset cruciform (torque set)
  • Thread Diameter
    0.190 inches
  • Grip Length
    Between 1.923 inches and 1.953 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
  • Surface Finish
    32.0 microinches grip
  • Material
    Steel comp e4340 or steel comp 4140 or steel comp 8740
  • Material Specification
    Mil-s-5000 military specification 1st material response or mil-s-5626 military specification 2nd material response or mil-s-6049 military specification 3rd material response
  • Surface Treatment
    Cadmium and chromate or cadmium
  • Surface Treatment Specification
    Qq-p-416 ty2 cl2 federal specification 1st treatment response or nas 672 assn standard 2nd 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 5305010481141

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
51B221-31 Northrop Grumman Technical Services,
51B221-31 Northrop Grumman Systems Corporation
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