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NSN 5305-01-512-7265

High Torque Screw

About this product

0.969 inches fastener length, flat countersunk head style, between 0.3898 inches and 0.3948 inches head diameter, grip diameter: between 0.2490 inches and 0.2495 inches .

Manufacturer part number ST3M557-4-8 for national stock number 5305015127265.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-01-512-7265.

  • MPN or Model

    ST3M557-4-8

  • Schedule B
    7508.90.0000 (Other articles of nickel, nesoi (excluding cloth, grill & netting of nickel wire))
  • NMF (National Motor Freight)
    093486 - Bolts, Nuts Or Screws, NOI (sub 3)
  • Unit Weight (Est.)
    0.1 lb
  • Thread Class
    3a
  • Thread Direction
    Right-hand
  • Thread Length
    0.469 inches
  • Fastener Length
    0.969 inches
  • Head Style
    Flat countersunk
  • Head Diameter
    Between 0.3898 inches and 0.3948 inches
  • Grip Diameter
    Between 0.2490 inches and 0.2495 inches
  • Internal Drive Style
    High-torque
  • End Application
    Fuselage aft
  • Thread Diameter
    0.250 inches
  • Grip Length
    Between 0.490 inches and 0.510 inches
  • Thready Qty Per Inch (tpi)
    28
  • Countersink Angle
    Between 99.0 degrees and 101.0 degrees
  • Material
    Nickel alloy 718
  • Material Specification
    Ams 5662 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 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 5305015127265

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
ST3M557-4-8 Boeing Company, The
11923-4-8 Reid Products Inc.
HT4027-4-8 Arconic Global Fasteners & Rings,
HT4027-4-8 Hi-shear Corporation
HT4027-4-8 Sps Technologies, Llc
ST3M557-4-8 Fastener Innovation Technology, Inc.
WC4027-4-8 West Coast Aerospace Inc
HT4027-4-8 Lisi Aerospace Canada Corp
HT4027-4-8 Sps Technologies Inc
ST3M557 Boeing Company, The
ST3M557-4-8 Twist Tite Mfg, Inc
Stock Check
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