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  • 3/8" (5/16"-18) UNC Socket Head Shoulder Screw - Black Oxide 221049 - 221097
  • 3/8" (5/16"-18) UNC Socket Head Shoulder Screw - Black Oxide 221049 - 221097
  • 3/8" (5/16"-18) UNC Socket Head Shoulder Screw - Black Oxide 221049 - 221097
  • 3/8" (5/16"-18) UNC Socket Head Shoulder Screw - Black Oxide 221049 - 221097
  • 3/8" (5/16"-18) UNC Socket Head Shoulder Screw - Black Oxide 221049 - 221097

    • 3/8" (5/16"-18) UNC Socket Head Shoulder Screw - Black Oxide 221049 - 221097

    Brighton Best

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    SKU:
    BBI 221049 - 221097
    Weight:
    0.00 LBS
    Box quantity shown in drop down:
    Sold as each
    Class Fit:
    3A
    Head type:
    Shoulder
    Hardness range:
    Rockwell 32-43
    Standard:
    ASME/ANSI B18.3-1986 & ASTM A574-92A

    Product Description

  • Black oxide steel socket head shoulder screws are considered grade 12 (12.9). The socket head shoulder screws offer a very high tensile strength of 170,000 psi when tested lengthwise.
  • The shoulder screws are offered in both black oxide and stainless steel. The steel screws are mildly corrosion resistant in dry environments as the screws are covered with a light protective oil coating.
  • Stainless steel offers the best protection against deterioration but has caveats. The tensile strength of type 316 stainless steel is only slightly stronger than un-hardened grade 2 ferrous steel. Also, please be aware that when combining stainless steel fasteners; especially stainless lock nuts regardless the thread type or bolt diameter, it's recommended to coat the male bolt threads in never-seez before assembly as galling can occur and cause the nut to fuse to the bolt during installation/disassembly, leaving the threads looking melted as the nut seizes in place and any further turning of the wrench just shears the bolt in half.
  • To correctly identify/specify the length "L" of a socket head shoulder screw, measure under the head like a standard head screw but only include the shoulders length, not the threaded portion as it is not added to the screws overall length when describing them.
  • When selecting inch threads, thread pitch is measured by counting every thread contained within 1" and is spoken as "threads per inch" (i.e. 3/8"-16 TPI)
  • When selecting metric threads, thread pitch is measured from one thread peak to the next in millimeters (i.e. M10-1.25mm). Many metric threaded bolts are cut with fine and extra-fine threads which further necessitate the need for proper thread identification before ordering. Vernier calipers and thread gauges proove invaluable for this task.

  • Click this link for a detailed Wiki explanation on the Unified Thread Standard

  • Click this link for a detailed Wiki explanation on the Metric Thread Standard

  • Fasteners meet ASTM A574, ASTM A574M, and ISO 898-1 comply with specifications and testing requirements for material quality. Fasteners meet ASME B18.3, ASME B18.3M, ISO 21269, and ISO 4762 (formerly DIN 912) comply with specifications for dimensional standards.

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    Custom Field

    Box quantity shown in drop down Sold as each
    Class Fit 3A
    Head type Shoulder
    Hardness range Rockwell 32-43
    Standard ASME/ANSI B18.3-1986 & ASTM A574-92A

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