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NSN 5305-01-612-7990

High Torque Screw

About this product

2.175 inches fastener length, flat countersunk head style, between 0.2578 inches and 0.3047 inches head diameter, head height: 0.049 inches .

Manufacturer part number NAS1581C3T29 for national stock number 5305016127990.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-01-612-7990.

  • MPN or Model

    NAS1581C3T29

  • 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
    0.363 inches
  • Fastener Length
    2.175 inches
  • Head Style
    Flat countersunk
  • Head Diameter
    Between 0.2578 inches and 0.3047 inches
  • Head Height
    0.049 inches
  • Grip Diameter
    Between 0.1885 inches and 0.1895 inches
  • Internal Drive Style
    Offset cruciform (torque set)
  • Thread Diameter
    0.1900 inches
  • Grip Length
    1.812 inches
  • Thready Qty Per Inch (tpi)
    32
  • Countersink Angle
    Between 99.0 degrees and 101.0 degrees
  • Material
    Stainless steel
  • 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 5305016127990

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
NAS1581C3T29 National Aerospace Standards
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