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NSN 5306-01-613-1566

Close Tolerance Hex Head Bolt

About this product

2.017 inches fastener length, spline extended washer head style, 0.393 inches head height, extended washer diameter: 0.812 inches .

Manufacturer part number ST3M753-7-21 for national stock number 5306016131566.

Datasheet

  • Product description

    Close Tolerance Bolt NSN 5306-01-613-1566.

  • MPN or Model

    ST3M753-7-21

  • Schedule B
    7318.15.2000 (Bolts and bolts and their nuts or washers exported in the same shipment)
  • Thread Class
    3a
  • Thread Direction
    Right-hand
  • Thread Length
    0.705 inches
  • Fastener Length
    2.017 inches
  • Head Style
    Spline extended washer
  • Head Height
    0.393 inches
  • Extended Washer Diameter
    0.812 inches
  • Extended Washer Thickness
    0.063 inches
  • Grip Diameter
    Between 0.4365 inches and 0.4370 inches
  • Head Minor Diameter
    0.500 inches
  • Thread Diameter
    0.437 inches
  • Grip Length
    1.312 inches
  • Thready Qty Per Inch (tpi)
    20
  • Min. Tensile Strength (psi)
    220000 pounds per square inch
  • Material
    Steel comp xm-13
  • Material Specification
    Ams 5629 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 Bolt

An externally threaded fastener whose unthreaded portion is of a specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001) of an inch (0.025 mm) or less of a specific diameter for items one inch (25 mm) or less in diameter. Items over one inch (25 mm) in diameter shall have a tolerance of fifteen ten-thousandths (0.0015) of an inch (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001) of an inch (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 not designed to be held or driven with an inserted driver, nor is it designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. For items having close tolerance, and fabricated from material having 160,000 pounds per square inch (1100 megapascals) minimum tensile strength, see bolt, shear. For items fabricated from material having less than 160,000 pounds per square inch (1100 megapascals) minimum tensile strength and not having a close tolerance, see bolt, machine.

Mechanic Bill explains Close Tolerance Hex Head Bolt

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NSN 5306016131566

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
ST3M753-7-21 Boeing Company, The
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