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NSN 5305-01-483-3553

High Torque Screw

About this product

Between 1.705 inches and 1.735 inches fastener length, flat countersunk head style, between 0.337 inches and 0.383 inches head diameter, grip diameter: between 0.1890 inches and 0.1895 inches .

Manufacturer part number BACB30LH3U21 for national stock number 5305014833553.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-01-483-3553.

  • MPN or Model

    BACB30LH3U21

  • 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 0.320 inches and 0.370 inches
  • Fastener Length
    Between 1.705 inches and 1.735 inches
  • Head Style
    Flat countersunk
  • Head Diameter
    Between 0.337 inches and 0.383 inches
  • Grip Diameter
    Between 0.1890 inches and 0.1895 inches
  • Internal Drive Style
    Cross recess type 1
  • Thread Diameter
    0.190 inches
  • Grip Length
    Between 1.303 inches and 1.323 inches
  • Thready Qty Per Inch (tpi)
    32
  • Countersink Angle
    100.0 degrees
  • Surface Finish
    32.0 microinches threads
  • Material
    Iron alloy 660
  • Surface Treatment
    Passivate
  • 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 5305014833553

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
BACB30LH3U21 The Boeing Company
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