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NSN 5305-01-521-4847

High Torque Screw

About this product

Thread end to be identified w/black dye or paint.

Manufacturer part number BACB30NN4K20 for national stock number 5305015214847.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-01-521-4847.

  • MPN or Model

    BACB30NN4K20

  • Schedule B
    8109.90.0000 (Zirconium and articles thereof nesoi)
  • Thread Class
    3a
  • Thread Direction
    Right-hand
  • Thread Length
    0.425 inches
  • Fastener Length
    1.513 inches
  • Head Style
    Flat countersunk
  • Head Diameter
    Between 0.465 inches and 0.510 inches
  • Grip Diameter
    0.250 inches
  • Internal Drive Style
    Cross recess type 1
  • End Application
    Aircraft, b757
  • Thread Diameter
    0.250 inches
  • Grip Length
    1.250 inches
  • Thready Qty Per Inch (tpi)
    28
  • Countersink Angle
    Between 99.0 degrees and 101.0 degrees
  • Material
    Titanium alloy
  • Surface Treatment
    Aluminum
  • 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 5305015214847

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
BACB30NN4K20 The Boeing Company
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