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NSN 5305-01-251-7552

High Torque Screw

About this product

Between 3.097 inches and 3.122 inches fastener length, flat countersunk head style, between 0.455 inches and 0.510 inches head diameter, grip diameter: between 0.2485 inches and 0.2495 inches .

Manufacturer part number BACB30LU4-43 for national stock number 5305012517552.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-01-251-7552.

  • MPN or Model

    BACB30LU4-43

  • Thread Class
    3a
  • Thread Direction
    Right-hand
  • Thread Length
    Between 2.914 inches and 3.010 inches
  • Fastener Length
    Between 3.097 inches and 3.122 inches
  • Head Style
    Flat countersunk
  • Head Diameter
    Between 0.455 inches and 0.510 inches
  • Grip Diameter
    Between 0.2485 inches and 0.2495 inches
  • Internal Drive Style
    Cross recess type 1
  • Thread Diameter
    0.250 inches
  • Grip Length
    Between 2.677 inches and 2.697 inches
  • Thready Qty Per Inch (tpi)
    28
  • Min. Tensile Strength (psi)
    125000 pounds per square inch
  • Countersink Angle
    Between 99.0 degrees and 101.0 degrees
  • Surface Finish
    32.0 microinches threads
  • Material
    Steel comp e4340 or steel comp 8740
  • Material Specification
    Mil-s-5000 military specification 1st material response or mil-s-6049 military specification 2nd material response or ams 6322 assn standard 2nd material response
  • Surface Treatment
    Cadmium and chromate
  • Surface Treatment Specification
    Qq-p-416, type 2 cl 2 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 5305012517552

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
BACB30LU4-43 The Boeing Company
BACB30LU4-43 Huck International, Inc.
BACB30LU4-43 Sps Technologies, Llc
BACB30LU4-43 Sonic Industries Inc.
BACB30LU4-43 Valley-todeco, Inc.
BACB30LU4-43 Sps Technologies, Llc
BACB30LU4-43 Arconic Global Fasteners & Rings,
BACB30LU4-43 Federal Manufacturing Corporation
BACB30LU4-43 Sps Technologies, Llc
BACB30LU4-43 Sps Technologies, Llc
BACB30LU4-43 Alcoa Global Fasteners, Inc.
BACB30LU4-43 Huck Intl Inc
Stock Check
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