NSN 5305-01-090-6337

High Torque Screw

About this product

Between 1.722 inches and 1.752 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 BACB30LR4-21 for national stock number 5305010906337.


  • Product description

    Close Tolerance Screw NSN 5305-01-090-6337.

  • 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)
  • Unit Weight (Est.)
    0.1 lb
  • Thread Class
  • Thread Direction
  • Thread Length
    Between 0.400 inches and 0.450 inches
  • Fastener Length
    Between 1.722 inches and 1.752 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 1.302 inches and 1.322 inches
  • Thready Qty Per Inch (tpi)
  • Countersink Angle
    Between 99.0 degrees and 101.0 degrees
  • Material
    Iron alloy 660
  • Material Specification
    Ams 5737 assn standard single material response
  • Surface Treatment
    Cadmium and chromate
  • Surface Treatment Specification
    Qq-p-416 type 2 cl 3 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 5305010906337

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
BACB30LR4-21 The Boeing Company
BACB30LR4-21 Sps Technologies, Llc
BACB30LR4-21 Valley-todeco, Inc.
BACB30LR4-21 Federal Manufacturing Corporation
BACB30LR4-21 Arconic Global Fasteners & Rings,
BACB30LR4-21 Sps Technologies, Llc
BACB30LR4-21 Sps Technologies, Llc
BACB30LR4-21 Huck Intl Inc
BACB30LR4-21 Huck International, Inc.
Stock Check
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