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HTT Tension Tie & Holdown
Description

Simpson Strong‑Tie offer a wide variety of holdown devices designed and tested to address many applications and load demands. The HTT Tension Tie & Holdown is designed for heavy‑duty holdown applications on single or double studs and offer a solution for resisting tension loads.

The heavy‑duty HTT is ideal for retrofit or new construction projects. They provide high-strength, post-pour, concrete-to-steel connections. The HTT is also suitable for residential and commercial projects, sub diaphragm floor, seismic upgrades, mid floor vertical connection applications.

The HTT is a single-piece formed tension tie — no rivets, no welding points and a 4-ply formed seat. No washers are required. They feature an optimised nailing pattern which results in better performance with less deflection.

Key Features
  • A single piece folded and no weak point of welding, provide ultimate strength tension tile
  • Unique nailing patten that provides better results with less deflection
  • Stronger and safer than typical through-bolt installations for deck post connections
  • Uses Strong-Drive® SDS Heavy-Duty Connector screws which install easily, reduce fastener slip and provide a greater net section area of the post compared to bolts
  • Suitable for heavy duty holdown applications on single or double studs
  • Helps prevent a common type of deck failure
  • 15mm diameter anchor hole can accommodate Simpson Strong-Tie M12 Titen HD Screw Anchor or any M14 threaded rods
  • HTT5 and HTT5KT are suitable for steel frame holdown connections
Scope of Use

Applications:

  • Heavy‑duty holdown applications
  • Resisting tension load applications 
  • Shearwalls, studs to foundation connections
  • Concrete-to-steel connections
  • Retrofit or new construction projects
  • Residential and commercial projects
  • Sub diaphragm floor, seismic upgrades, mid floor vertical connection applications
  • Steel frame applications
Limitations on Use

Installation:

  • Use all specified fasteners
  • The HTT requires no additional washer
  • Strong‑Drive SDS Heavy‑Duty Connector screws install best with a low speed high torque drill with a 3/8” hex head driver
Statement of Building Code Compliance
  • HTT Tension Tie & Holdowns are compliant with NZS 3604:2011
B1 Structure compliant
Structure
B2 Durability compliant
Durability
Independent Assessment
Independent Assessment
Test Results
Test Results
Documents
CAD Drawings
Technical Data Sheet
IAPMO UES Evaluation Report

ER-0130

Product Approval

FL11496

Research Report

COLA-RR-25489

Research Report

COLA-RR-25818

Installation Guide
Flyer
Full Catalogue: Timber Connectors NZS3604

F-C-NZS3604-20

A leader in structural systems research, testing and innovation, Simpson Strong-Tie is among the world's largest suppliers of solutions and products, helping build safer, stronger structures.

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