NSN 5305-01-056-3205

High Torque Screw

About this product

Between 0.892 inches and 0.922 inches fastener length, flat countersunk head style, between 0.574 inches and 0.637 inches head diameter, grip diameter: between 0.3110 inches and 0.3120 inches .

Manufacturer part number BACB30LU5-7 for national stock number 5305010563205.


  • Product description

    Close Tolerance Screw NSN 5305-01-056-3205.

  • MPN or Model


  • 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
  • Thread Direction
  • Thread Length
    Between 0.444 inches and 0.494 inches
  • Fastener Length
    Between 0.892 inches and 0.922 inches
  • Head Style
    Flat countersunk
  • Head Diameter
    Between 0.574 inches and 0.637 inches
  • Grip Diameter
    Between 0.3110 inches and 0.3120 inches
  • Internal Drive Style
    Cross recess type 1
  • Thread Diameter
    0.312 inches
  • Grip Length
    Between 0.428 inches and 0.448 inches
  • Thready Qty Per Inch (tpi)
  • Countersink Angle
    100.0 degrees
  • Surface Finish
    32.0 microinches threads
  • Material
    Steel comp e4340 or steel comp 4340 or steel comp 8740
  • Surface Treatment
    Cadmium and chromate
  • Surface Treatment Specification
    Qq-p-416, type 2, class 2 federal specification single treatment response
  • Thread Series Designator
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 5305010563205

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
BACB30LU5-7 Huck International, Inc.
BACB30LU5-7 Valley-todeco, Inc.
BACB30LU5-7 Sps Technologies, Llc
BACB30LU5-7 Arconic Global Fasteners & Rings,
BACB30LU5-7 Sps Technologies, Llc
BACB30LU5-7 Sps Technologies, Llc
BACB30LU5-7 Sonic Industries Inc.
BACB30LU5-7 Sps Technologies, Llc
BACB30LU5-7 Alcoa Global Fasteners, Inc.
BACB30LU5-7 Federal Manufacturing Corporation
BACB30LU5-7 The Boeing Company
BACB0LU5-7 Huck Intl Inc
BACB30LU5-7 Huck Intl Inc
Stock Check
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