Simpson Strong‑Tie offers 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.

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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.

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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 optimized nailing pattern which results in better performance with less deflection.

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Please check the Corrosion Information to see if it is suitable for your application.

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Carbon Steel 3.1mm thick

Z275 Galvanised

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A single piece folded and no weak point of welding, provide ultimate strength tension tile
Unique nailing pattern that provides better results with less deflection
Stronger and safer than typical through-bolt installations for deck post connections
Uses Strong-Drive^® SD 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
17mm diameter anchor hole can accommodate Simpson Strong-Tie M12 Titen HD Screw Anchor or any M16 threaded rods
HTT5 is suitable for steel frame holdown connections

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\r\n\t\t\t\t Model No. \r\n\t\t\t	\r\n\t\t\t\t Dimensions (mm) \r\n\t\t\t	\r\n\t\t\t\t Fasteners \r\n\t\t\t	\r\n\t\t\t\t Minimum Timber Member Size (Depth x Breadth, mm) \r\n\t\t\t	\r\n\t\t\t\t Country \r\n\t\t\t	\r\n\t\t\t\t Design Tension Capacity (kN) \r\n\t\t\t
\r\n\t\t\t\t Strap \r\n\t\t\t\t\tThickness \r\n\t\t\t	\r\n\t\t\t\t W \r\n\t\t\t	\r\n\t\t\t\t H \r\n\t\t\t	\r\n\t\t\t\t B \r\n\t\t\t	\r\n\t\t\t\t CL \r\n\t\t\t	\r\n\t\t\t\t Anchor Bolt Dia (mm) \r\n\t\t\t	\r\n\t\t\t\t Post (Nails: No. - Length x Dia., Screws: No. - Dia. x Length, mm) \r\n\t\t\t
\r\n\t\t\t\t HTT4 \r\n\t\t\t	\r\n\t\t\t\t 3.1 \r\n\t\t\t	\r\n\t\t\t\t 65 \r\n\t\t\t	\r\n\t\t\t\t 315 \r\n\t\t\t	\r\n\t\t\t\t 60 \r\n\t\t\t	\r\n\t\t\t\t 33 \r\n\t\t\t	\r\n\t\t\t\t 16 \r\n\t\t\t	\r\n\t\t\t\t 18 – 38 x 3.75 \r\n\t\t\t	\r\n\t\t\t\t 140 x 38 \r\n\t\t\t	\r\n\t\t\t\t AU \r\n\t\t\t	\r\n\t\t\t\t k1 = 1.14 \r\n\t\t\t
\r\n\t\t\t\t 15.30 \r\n\t\t\t
\r\n\t\t\t\t NZ \r\n\t\t\t	\r\n\t\t\t\t k1 = 1.0 \r\n\t\t\t
\r\n\t\t\t\t 14.40 \r\n\t\t\t
\r\n\t\t\t\t 90 x 75 \r\n\t\t\t	\r\n\t\t\t\t AU \r\n\t\t\t	\r\n\t\t\t\t k1 = 1.14 \r\n\t\t\t
\r\n\t\t\t\t 18.38 \r\n\t\t\t
\r\n\t\t\t\t NZ \r\n\t\t\t	\r\n\t\t\t\t k1 = 1.0 \r\n\t\t\t
\r\n\t\t\t\t 17.05 \r\n\t\t\t
\r\n\t\t\t\t 18 – SD#10 x 38 \r\n\t\t\t	\r\n\t\t\t\t 140 x 38 or 90 x 75 \r\n\t\t\t	\r\n\t\t\t\t AU \r\n\t\t\t	\r\n\t\t\t\t k1 = 1.14 \r\n\t\t\t
\r\n\t\t\t\t 23.04 \r\n\t\t\t
\r\n\t\t\t\t NZ \r\n\t\t\t	\r\n\t\t\t\t k1 = 1.0 \r\n\t\t\t
\r\n\t\t\t\t 18.97 \r\n\t\t\t
\r\n\t\t\t\t HTT5 \r\n\t\t\t	\r\n\t\t\t\t 3.1 \r\n\t\t\t	\r\n\t\t\t\t 65 \r\n\t\t\t	\r\n\t\t\t\t 405 \r\n\t\t\t	\r\n\t\t\t\t 60 \r\n\t\t\t	\r\n\t\t\t\t 33 \r\n\t\t\t	\r\n\t\t\t\t 16 \r\n\t\t\t	\r\n\t\t\t\t 26 - 38 x 3.75 \r\n\t\t\t	\r\n\t\t\t\t 90 x 75 \r\n\t\t\t	\r\n\t\t\t\t AU \r\n\t\t\t	\r\n\t\t\t\t k1 = 1.14 \r\n\t\t\t
\r\n\t\t\t\t 20.44 \r\n\t\t\t
\r\n\t\t\t\t NZ \r\n\t\t\t	\r\n\t\t\t\t k1 = 1.0 \r\n\t\t\t
\r\n\t\t\t\t 17.05 \r\n\t\t\t
\r\n\t\t\t\t 26 - SD#10 x 38 \r\n\t\t\t	\r\n\t\t\t\t 140 x 38 \r\n\t\t\t	\r\n\t\t\t\t AU \r\n\t\t\t	\r\n\t\t\t\t k1 = 1.14 \r\n\t\t\t
\r\n\t\t\t\t 28.91 \r\n\t\t\t
\r\n\t\t\t\t NZ \r\n\t\t\t	\r\n\t\t\t\t k1 = 1.0 \r\n\t\t\t
\r\n\t\t\t\t 21.31 \r\n\t\t\t
\r\n\t\t\t\t HTT22E \r\n\t\t\t	\r\n\t\t\t\t 3.1 \r\n\t\t\t	\r\n\t\t\t\t 63 \r\n\t\t\t	\r\n\t\t\t\t 558 \r\n\t\t\t	\r\n\t\t\t\t 60 \r\n\t\t\t	\r\n\t\t\t\t 33 \r\n\t\t\t	\r\n\t\t\t\t 18.5 \r\n\t\t\t	\r\n\t\t\t\t 31 – SD#10 x 64 \r\n\t\t\t	\r\n\t\t\t\t 90 x 75 \r\n\t\t\t	\r\n\t\t\t\t AU \r\n\t\t\t	\r\n\t\t\t\t k1 = 1.14 \r\n\t\t\t
\r\n\t\t\t\t 22.3 \r\n\t\t\t
\r\n\t\t\t\t NZ \r\n\t\t\t	\r\n\t\t\t\t k1 = 1.0 \r\n\t\t\t
\r\n\t\t\t\t 17.1 \r\n\t\t\t
\r\n\t\t\t\t \r\n\t\t\t\t\t Design Capacity is the lesser of (1) the Characteristic Capacity multiplied by the Australian Capacity Factor, or the NZ Strength Reduction Factor (φ), and applicable the k modification factors following AS 1720.1 and NZS 3603 and (2) the Serviceability Capacity which is the load at 6.4mm joint slip, which includes fastener slip, anchor elongation and holdown deformation. Design Capacity is the minimum of test data and structural joint calculation. \r\n\t\t\t\t\t For Australia, the Capacity Factor (φ) is 0.85 for nails and screws for structural joints in a Category 1 application. Reduce tabulated values where other Category applications govern. For NZ, the Strength Reduction Factor (φ) is 0.80 for nails in lateral load and 0.70 for other fasteners. \r\n\t\t\t\t\t Duration of Load Factor (k1) is as shown. Reduce Duration of Load Factor where applicable. Capacities may not be increased. \r\n\t\t\t\t\t Timber species for joint design is seasoned Radiata Pine, which is Australia Joint Group JD4 per AS 1720.1 Table H2.4 and New Zealand Joint Group J5 per NZS 3603 Table 4.1. \r\n\t\t\t\t\t The Designer must specify anchor bolt type, length and embedment. Fasteners for the HTT4 are sold separately. \r\n\t\t\t\t\t Anchor bolt nut should be finger tight plus 1/3 to 1/2 turn with a hand wrench. Care should be taken not to over-tighten the nut. \r\n\t\t\t\t\t Post or beam design by Designer. Posts may consist of multiple members provided they are connected independently of the holdown fasteners. \r\n\t\t\t\t\t Structural composite timber columns have sides that either show the wide face or the edges of the timber strands/ veneers, known as the narrow face. \r\n\t\t\t\t\t Simpson Strong-Tie stainless-steel connectors require stainless-steel fasteners. Values in the table reflect installation into the wide face. \r\n\t\t\t\t\t Holdowns and tension ties are for use in vertical or horizontal applications. \r\n\t\t\t\t\t Holdowns and tension ties may be installed raised up to 460mm above the top of the concrete with no load reduction, provided that additional elongation of the anchor rod is taked into account. \r\n\t\t\t\t \r\n\t\t\t

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HTT Tension Tie & Holdown