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NSN 5305-01-421-7544

High Torque Screw

About this product

Between 1.700 inches and 1.730 inches fastener length, flat countersunk head style, between 0.464 inches and 0.506 inches head diameter, grip diameter: between 0.2485 inches and 0.2495 inches .

Manufacturer part number NAS1580C4R21D for national stock number 5305014217544.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-01-421-7544.

  • MPN or Model

    NAS1580C4R21D

  • 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
    0.403 inches
  • Fastener Length
    Between 1.700 inches and 1.730 inches
  • Head Style
    Flat countersunk
  • Head Diameter
    Between 0.464 inches and 0.506 inches
  • Grip Diameter
    Between 0.2485 inches and 0.2495 inches
  • Shank Unthreaded Hole Diameter
    0.076 inches threads and 0.086 inches threads
  • Internal Drive Style
    Cross recess type 1
  • Thread Diameter
    0.250 inches
  • Grip Length
    Between 1.302 inches and 1.322 inches
  • Thready Qty Per Inch (tpi)
    28
  • Min. Tensile Strength (psi)
    180000 pounds per square inch
  • Countersink Angle
    Between 99.0 degrees and 101.0 degrees
  • Distance From Head Largest Bearing Surface To Shank Hole Center
    1.574 inches threads and 1.624 inches threads
  • Material
    Iron alloy 660
  • Surface Treatment
    Passivate
  • Surface Treatment Specification
    Qq-p-35 federal specification single treatment response
  • Thread Series Designator
    Unjf
  • Specification Data
    80205-nas1580 professional/industrial association standard
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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 5305014217544

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
NAS1580C4R21D National Aerospace Standards
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