STS Industrial - Bolts & Screws

 

SMSA/DMSA MACHINE SCREW ANCHORS

AUTHORIZED SIMPSON STRONG-TIE DISTRIBUTOR

The SMSA is a corrosion resistant, die cast machine bolt anchor with a single internal expanding cone for use in concrete, concrete block and brick.

The DMSA utilizes the same basic anchor design as the SMSA but with double expansion cones to provide higher loads and better performance in base materials of questionable strength.

Machine Screw Anchors

  • SMSA PRODUCT DATA

    SMSA Product Data

    Machine bolt is not included.

    SMSA TENSION LOADS IN NORMAL-WEIGHT CONCRETE

    SMSA Tension Loads in Normal Weight Concrete

    1. The allowable loads listed are based on a safety factor of 4.0.
    2. The minimum concrete thickness is 1 1/2 times the embedment depth.
    3. Machine bolt is not included.
    SMSA TENSION AND SHEAR LOADS IN LIGHTWEIGHT HOLLOW CMU

    SMSA Tension Loads in Normal Weight Concrete

    1. Values for 8-inch wide concrete masonry units. The minimum specified compressive strength of masonry is 1,900 psi.
    2. Embedment depth is measured from the outside face of the concrete masonry unit for installation through a face shell.
    3. The tabulated allowable loads are based on a safety factor of 5.0 for installations under the IBC and IRC.
    4. All holes are drilled with a carbide-tipped drill bit in the rotation-only mode.

    DMSA PRODUCT DATA AND TENSION AND SHEAR LOADS IN NORMAL-WEIGHT CONCRETE

    DMSA Product Data and Tension and Shear Loads

    1. The allowable loads listed are based on a safety factor of 4.0.
    2. 100% of the allowable load is permitted at critical edge distance. No reduction in edge distance is allowed.
    3. The minimum concrete thickness is 1 1/2 times the embedment depth.
    4. Machine bolt is not included.
  • INSTALLATION:
    • Drill a hole in the base material using the appropriate diameter carbide drill bit as specified in the table. Drill the hole to the specified embedment depth plus 1/8 ” for flush mounting. Blow the hole clean using compressed air. Overhead installations need not be blown clean. Alternatively, drill the hole deep enough to accommodate embedment depth and dust from drilling.
    • Insert anchor into hole. Tap with hammer until flush with surface.
    • Position fixture; insert screw and tighten. The bolt must engage a minimum of 2/3 of the anchor threads.

    Caution: Oversized holes will make it difficult to set the anchor and will reduce the anchor’s load capacity.

    INSTALLATION SEQUENCE

    install sequence

  • CODE REPORTS:
    • DMSA Meets Federal Specifications A-A-1923A, Type 3, except DMSA25 and DMSA31.
    • SMSA Meets Federal Specifications A-A-1923A, Type 2

Sources: ASTM Standards for Mechanical Fasteners and Related Processes 2nd Edition, Inch Fastener Standards 8th Edition, Simpson Strong-Tie Anchoring and Fastening Systems for Concrete and Masonry, StrongTie.com

Note: All material included on this page is informational only, and should not be used as one’s sole source for design purposes. STS Industrial, Inc. and its affiliates do not guarantee the accuracy of the information on this site, and retain no liability for the use or misuse of the information contained on this site.