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HTT Heavy Tension Tie

Tension Ties

This product's information may differ depending on the category of use. You are currently viewing details related to Tension Ties. You can also view product information related to the category: Holdowns and Tension Ties for Cold-Formed Steel Construction

The HTT is a high-strength solution for resisting tension loads in post-pour, wood-to-concrete connections. This heavy, single-piece formed tension tie is fastened with nails or Strong-Drive® SD Connector screws. The HTT has a four-ply formed seat and a design without rivets that does not require washers.

Key Features

  • Optimized nailing pattern for better performance and less deflection
  • Ideal for retrofit or new construction projects
  • HTT5KT holdown is sold as a kit with the bearing plate, washer and Strong-Drive SD Connector screws

Material

  • See table

Finish

  • Galvanized. May be ordered HDG.

Installation

  • See Holdown and Tension Tie General Notes.
  • For information about marriage strap at panelized roof applications, see MSTD.
  • HTT5KT requires BP 5/8-2 bearing plate and #10 x 2 1/2" SD Strong-Drive Connector screws (included in kit).
  • The HTT4 and HTT5 feature an optimized nailing pattern which results in better performance with less deflection.
  • The HTT5-3/4 is designed to use a 3/4"-diameter anchor bolt.
  • When using with unreinforced concrete masonry, 3/4" post-installed anchor bolts are commonly used.
  • When installing over wood structural panel sheathing, use a 2 1/2"-long fastener minimum.

Related Literature

High Wind Guide
F-C-HWG23
A comprehensive guide to help designers select the most appropriate connections for high-wind regions.
Product Guide
Conectores para la construcción con madera 2021–2023
C-C-2021SP
El catálogo incluye información sobre nuevos productos, así como especificaciones e instrucciones de instalación aplicables para conectores estructurales de madera a madera y de madera a concreto.
Catalog
Wood Construction Connectors – Canadian Limit States Design
C-C-CAN2022
A complete product and application catalogue including load tables and installation information for wood-to-wood, wood-to-concrete and wood-to-masonry connectors.
Catalog
Connecteurs pour constructions en bois — Conception aux états limites canadiens
C-C-CAN2022CF
Un catalogue complet sur les produits et les applications, y compris de l’information sur l’installation et les tableaux de charge pour les connecteurs bois-à-bois, bois-à-béton et bois-à-maçonnerie.
Catalog
Connectors, Fasteners & Anchors for Mass Timber Construction
C-C-MASSTIMBER24
A catalog featuring connectors, fasteners and anchors for mass timber and CLT construction solutions.
Catalog
Wood Construction Connectors 2024-2025
C-C-2024
A catalog including new product information as well as any applicable specification and installation instructions for wood-to-wood and wood-to-concrete structural connectors.
Catalog
Connectors for Cold-Formed Steel Construction Catalog
C-CF-2023
A catalog for Connectors for Cold-Formed Steel Construction products and solutions.
Catalog
Installer's Pocket Guide
S-C-INSTALL22
A bilingual pocket installation guide for connectors.
Product Guide
Code-Compliant Guardrail Post Connections
T-C-GRDRLPST22
A technical bulletin featuring details and illustrations for code-compliant 36" and 42" guardrail post connections.
Technical Bulletin
Connector Solutions to Meet the Wall Bracing Requirements of the International Residential Code®
T-C-WALLBRACE23
A technical bulletin providing technical information about wall bracing methods and code sections that require connectors (e.g., holdowns or straps) and anchors.
Technical Bulletin
Connectors Installed on SCL Columns
T-C-SCLCLM23
A technical bulletin discussing the structural properties of the two different surface sides of SCL columns, with connector solutions (PCZ and EPC) added to the column bases and caps section.
Technical Bulletin
Connectors Installed on SCL Columns
T-C-SCLCLMCAN23
A Canadian Limit States technical bulletin addressing typical installations of Simpson Strong-Tie® connectors on SCL columns as well as reduction factors for narrow-face SCL installations.
Technical Bulletin
Simpson Strong-Tie® Holdowns on Cross-Laminated Timber Panels
L-C-HDCLT24
Simpson Strong-Tie evaluated the HDQ/HHDQ, HDU and HTT holdowns in cross-laminated timber (CLT) panel applications installed with SD and SDS screws.
Engineering Letter
Raised Holdowns with CFS
L-CF-RAISEDHD24
Raised Simpson Strong-Tie® holdowns in wood-sheathed cold-formed steel framed shearwalls.
Engineering Letter

Load Tables

    These products are available with additional corrosion protection. Additional products on this page may also be available with this option. Check with Simpson Strong-Tie for details.

    Many of these products are approved for installation with Strong-Drive® SD Connector screws.

HTT Load Table
  1. Allowable load for HTT5 with a BP 5/ 8-2 bearing-plate washer installed in the seat of the holdown is 5,295 lb. for DF/SP and 4,555 lb. for SPF/HF.
  2. Fasteners: Nail dimensions in the table are listed diameter by length. SD screws are Simpson Strong-Tie® Strong-Drive SD Connector screws. For additional information, see Fastener Types and Sizes Specified for Simpson Strong-Tie Connectors.

Code Reports & Compliance

Drawings

PDF DWG DXF RFA IFC SAT

Related Products

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LTT
Light Tension Tie
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S/HDU
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