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LTT Light Tension Tie


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The LTT is a solution for resisting tension loads that are fastened with nails. This light tension tie has a built-in load transfer plate washer for increased performance. The LTT is designed for horizontal purlin applications and may also be used for vertical holdown applications.

Key Features

  • Nailing patterns to accommodate different purlin/rafter/truss types
  • Low-profile seat to reduce visibility of tie
  • Tested with different anchor bolt diameters to meet code-required applications based on substrate


  • See table


  • Galvanized. May be ordered HDG; contact Simpson Strong-Tie.


  • See Holdown and Tension Tie General Notes.
  • A standard-cut washer is required for LTT19 and LTT20B when using 1/2" or 5/8" anchor bolts. No additional washer is required when using a 3/4" anchor bolt.
  • For information about marriage strap at panelized roof applications, see MSTD.
  • The LTT19 light tension tie is designed for 2x joists or purlins.
  • The LTT20B is for nail- or bolt-on applications. The 3" nail spacing makes the LTT20B suitable for wood I-joists using 0.148" x 1 1/2" nails.
  • The LTTI31 is designed for wood-chord open-web truss attachments to concrete or masonry walls and may also be installed vertically on a minimum 2x6 stud.

Related Literature

Product Information Table

Fastener Production Information and Stuff & Things
Model No. Base/Seat Thickness (in.) Ga. W (in.) L (in.) CL (in.) Coating/Material Packaging Qty.
LTT19 5/16 16 1 3/4 19 1/8 1 3/8 Zinc Galvanized, G90 1
LTT20B 5/16 12 2 19 3/4 1 1/2 Zinc Galvanized, G90 1
LTTI31 1/4 18 3 3/4 31 1 3/8 Zinc Galvanized, G90 1

Load Tables

LTT Load Table
  1. LTTI31 installed flush with concrete or masonry has an allowable load of 2,285 lb.
  2. Fasteners: Nail dimensions in the table are listed diameter by length. For additional information, see Fastener Types and Sizes Specified for Simpson Strong-Tie Connectors.

Code Reports & Compliance