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NSN 5305-01-191-3123

High Torque Screw

About this product

Between 0.642 inches and 0.672 inches fastener length, flat countersunk head style, between 0.266 inches and 0.305 inches head diameter, grip diameter: between 0.1885 inches and 0.1890 inches .

Manufacturer part number BACB30LL3U5 for national stock number 5305011913123.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-01-191-3123.

  • MPN or Model

    BACB30LL3U5

  • 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
    3a
  • Thread Direction
    Right-hand
  • Thread Length
    Between 0.320 inches and 0.370 inches
  • Fastener Length
    Between 0.642 inches and 0.672 inches
  • Head Style
    Flat countersunk
  • Head Diameter
    Between 0.266 inches and 0.305 inches
  • Grip Diameter
    Between 0.1885 inches and 0.1890 inches
  • Internal Drive Style
    High-torque
  • End Application
    Helicopter, chinook, ch-47
  • Thread Diameter
    0.190 inches
  • Grip Length
    Between 0.302 inches and 0.322 inches
  • Thready Qty Per Inch (tpi)
    32
  • Countersink Angle
    Between 99.0 degrees and 101.0 degrees
  • Surface Finish
    32.0 microinches threads
  • Material
    Iron alloy 660
  • Material Specification
    Ams5737 assn standard single material response
  • Surface Treatment
    Passivate
  • Surface Treatment Specification
    Qq-p-35 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 5305011913123

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
BACB30LL3U5 Huck International, Inc.
BACB30LL3U5 The Boeing Company
BACB30LL3U5 Hi-shear Corporation
BACB30LL3U5 Sps Technologies, Llc
BACB30LL3U5 Alcoa Global Fasteners, Inc.
BACB30LL3U5 Lisi Aerospace Canada Corp
BACB30LL3U5 Huck Intl Inc
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