NSN 5306-01-549-7658

Close Tolerance Hex Head Bolt

About this product

1.925 inches fastener length, hexagon head style, 0.125 inches head height, width between flats: between 0.429 inches and 0.439 inches .

Manufacturer part number NAS6704U24 for national stock number 5306015497658.


  • Product description

    Close Tolerance Bolt NSN 5306-01-549-7658.

  • 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)
  • Thread Class
  • Thread Direction
  • Thread Length
    0.425 inches
  • Fastener Length
    1.925 inches
  • Head Style
  • Head Height
    0.125 inches
  • Width Between Flats
    Between 0.429 inches and 0.439 inches
  • Grip Diameter
    0.249 inches
  • End Application
  • Thread Diameter
    0.250 inches
  • Grip Length
    1.500 inches
  • Thready Qty Per Inch (tpi)
  • Material
    Stainless steel
  • Surface Treatment
  • Surface Treatment Specification
    Qq-p-35 federal specification single treatment response
  • Thread Series Designator
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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

Pricing and Availability

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
NAS6704U24 National Aerospace Standards
Stock Check
Availability for this item was last checked on 10/05/22. The quantities and conditions available at the time were:
  • NE: 11351
  • NS: 78
  • SV: 1