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NSN 5305-01-337-0357

High Torque Screw

About this product

Red dye or paint on thread end before lubrication.

Manufacturer part number BACB30MS7R21 for national stock number 5305013370357.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-01-337-0357.

  • MPN or Model

    BACB30MS7R21

  • Schedule B
    8109.90.0000 (Zirconium and articles thereof nesoi)
  • NMF (National Motor Freight)
    096640 - Screws, Iron Or Steel
  • Thread Class
    3a
  • Thread Direction
    Right-hand
  • Thread Length
    0.694 inches
  • Fastener Length
    Between 1.991 inches and 2.021 inches
  • Head Style
    Flat countersunk
  • Head Diameter
    Between 0.829 inches and 0.892 inches
  • Grip Diameter
    Between 0.4360 inches and 0.4370 inches
  • Internal Drive Style
    High-torque
  • Thread Diameter
    0.438 inches
  • Grip Length
    Between 1.302 inches and 1.322 inches
  • Features Provided
    Cetyl alcohol lubricant
  • Thready Qty Per Inch (tpi)
    20
  • Countersink Angle
    Between 99.0 degrees and 101.0 degrees
  • Surface Finish
    63.0 microinches bearing surface of head
  • Material
    Titanium alloy uns r56400
  • Material Specification
    Ams 4928 assn standard single material response or ams 4967 assn standard single material response
  • Surface Treatment
    Phosphate
  • Surface Treatment Specification
    Bac 5861, cage81205 mfr ref 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 5305013370357

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
BACB30MS7R21 Huck International, Inc.
BACB30MS7R21 The Boeing Company
BACB30MS7R21 Sps Technologies, Llc
BACB30MS7R21 Hi-shear Corporation
BACB30MS7R21 Sps Technologies, Llc
BACB30MS7R21 Arconic Global Fasteners & Rings,
BACB30MS7R21 Lisi Aerospace Canada Corp
BACB30MS7R21 Sps Technologies Inc
BACB30MS7R21 Huck Intl Inc
BACB30MS7R21 Alcoa Global Fasteners, Inc.
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