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NSN 5306-01-570-1471

Close Tolerance Hex Head Bolt

About this product

Bolt-close tolerance,12 point,flange head,220 ksi ftu,cres;undrilled.

Manufacturer part number MB84-4-20 for national stock number 5306015701471.

Datasheet

  • Product description

    Close Tolerance Bolt NSN 5306-01-570-1471.

  • MPN or Model

    MB84-4-20

  • 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
    0.468 inches
  • Fastener Length
    2.028 inches
  • Head Style
    Double hexagon extended washer
  • Head Height
    0.300 inches
  • Width Between Flats
    0.348 inches
  • Extended Washer Diameter
    0.433 inches
  • Extended Washer Thickness
    0.069 inches
  • Grip Diameter
    0.249 inches
  • End Application
    Nimrod 2000
  • Thread Diameter
    0.250 inches
  • Grip Length
    1.240 inches
  • Thready Qty Per Inch (tpi)
    28
  • Min. Tensile Strength (psi)
    4440 pounds per square inch
  • Part Name Assigned By Controlling Agency
    Close tolerance bolt
  • Material
    Steel comp xm-13
  • Material Specification
    Ams-5629 assn standard 1st material response
  • Surface Treatment
    Passivate
  • Surface Treatment Specification
    Ams-qq-p-35 assn standard 1st 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 5306015701471

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
MB84-4-20 Hi-shear Corporation
MB84-4-20 Lisi Aerospace Canada Corp
11831-4-20 Reid Products Inc.
ST3M571-4-20 Boeing Company, The
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