THA

Adjustable Truss Hanger

The THA is a one-piece joist hanger supporting trussed rafters and composite
timbers from timber members.
The THA can be installed with a number of fixing options, for greater load
capacity. See table below for fixing options.
Available in seat widths from 38mm to 100mm.

  • Location tab allows easier alignment to the carrying member.
  • Choice of installation specifications to suit wrap-over or face fix.
  • Speed prongs enable positioning of the hanger without nails before completing the install.
  • Nailing schedules are stamped into the strap to provide the correct information to site operatives.
  • The distinctive wide strap enhances the performance of the critical part of the connection by increasing the nail spacing and providing greater bearing area on the supporting girder.
CE Marking

Product Details

Images

THA configurations.

Features

Material

  • Pre-galvanised mild steel

Application

Suitable On

  • Solid sawn timber
  • Engineered timber

When to Use

  • Trusses
  • Joists

Technical Data

Dimensions

Product Dimensions

References Joist dimensions - face fix [mm] Joist dimensions - wrap over (N3.75x30 joist nails or N3.75x75 Double Shear Joist Nails) [mm] Joist dimensions - wrap over (N3.75x75 Nails throughout) [mm] Product Dimensions [mm] Header holes Joist holes
Header Header Header A B C D E F t Ø4.1 Dome nail holes
Min Max. Min Max. Min Max.
THA383819738122381473822662.559.511464.51.2226
THA444419744122441474422362.559.511164.51.2226
THA505019750122501475022062.559.510864.51.2226
THA7575197751227514775232.562.559.512064.51.2226
THA10010019710012210014710022062.559.510864.51.2226

Product capacities - Timber to timber - Face fix installation

References Number of Fasteners Characteristic Capacities [kN] Safe working loads - C27/TR26 [kN]
Header Joist R1.k R2.k R1,SWL,Long Term R1,SWL,Medium Term R2,SWL,Short Term
Qty Type Qty Type C27/TR26 N3.75x30 N3.75x30 N3.75x30 N3.75x30
N3.75x30
THA3820*6N3.75x3012.43.75.25.91.9
THA4420*6N3.75x3012.43.75.25.91.9
THA5020*6N3.75x3012.43.75.25.91.9
THA7520*6N3.75x3012.43.75.25.91.9
THA10020*6N3.75x3012.43.75.25.91.9

* Refer to capacity table columns for type of fasteners that can be used on header. Capacities depending on fastener type.

Product capacities - Timber to timber - Face fix installation (Double Shear Joist Nails)

References Number of Fasteners Characteristic capacities - Timber C27/TR26 [kN] Safe working loads - C27/TR26 [kN]
Header Joist R1.k R2.k R1,SWL,Long Term R1,SWL,Medium Term R2,SWL,Short Term
Qty Type Qty Type N3.75x30 N3.75x30 N3.75x30 N3.75x30 N3.75x30
THA3820N3.75*6N3.75x7515.45.36.47.32.7
THA4420N3.75*6N3.75x7515.45.36.47.32.7
THA5020N3.75*6N3.75x7515.45.36.47.32.7
THA7520N3.75*6N3.75x7515.45.36.47.32.7
THA10020N3.75*6N3.75x7515.45.36.47.32.7

* Refer to capacity table columns for type of fasteners that can be used on header. Capacities depending on fastener type.

Product capacities - Timber to timber - Face fix installation (N3.75x75 Nails throughout)

References Number of Fasteners Characteristic capacities - C27/TR26 [kN] Safe working Loads - C27/TR26 [kN]
Header Joist R1,k R2,k R1,SWL,Long Term R1,SWL,Medium Term R2,SWL, Short Term
Qty Qty N3.75x75 N3.75x75 N3.75x75 N3.75x75 N3.75x75
THA5026620.465.38.69.82.7
THA10026620.465.38.69.82.7

Product capacities - Timber to timber - Wrap over installation

References Number of Fasteners Characteristic Capacities [kN] Safe Working Loads - C27/TR26 [kN]
Header Joist R1,k R2,k R1,SWL,Long Term R1,SWL,Medium Term R2,SWL,Short Term
Top Face Qty C27/TR26 N3.75x30 N3.75x30 N3.75x30 N3.75x30
Qty Qty N3.75x30
THA3848610.53.74.451.9
THA4448610.53.74.451.9
THA5048610.53.74.451.9
THA7548610.53.74.451.9
THA10048610.53.74.451.9

Product capacities - Timber to timber - Wrap over installation (Double Shear Joist Nails)

References Number of Fasteners Characteristic capacities - C27/TR26 [kN] Safe Working Loads - C27/TR26 [kN]
Header Joist R1,k R2,k R1,SWL,Long Term R1,SWL,Medium Term R2,SWL,Short Term
Top Face Qty Type N3.75x30 N3.75x30 N3.75x30 N3.75x30 N3.75x30
Qty Type Qty Type
THA384N3.75*8N3.75*6N3.75x7516.45.36.87.82.7
THA444N3.75*8N3.75*6N3.75x7516.45.36.87.82.7
THA504N3.75*8N3.75*6N3.75x7516.45.36.87.82.7
THA754N3.75*8N3.75*6N3.75x7516.45.36.87.82.7
THA1004N3.75*8N3.75*6N3.75x7516.45.36.87.82.7

* Refer to capacity table columns for type of fasteners that can be used on header. Capacities depending on fastener type.

Product capacities - Timber to timber - Wrap over installation (N3.75x75 Nails throughout)

References Number of Fasteners Characteristic capacities - C27/TR26 [kN] Safe Working Load - C27/TR26 [kN]
Header Joist R1,k R2,k R1,SWL,Long Term R1,SWL,Medium Term R2,SWL,Short Term
Top Face Qty N3.75x75 N3.75x75 N3.75x75 N3.75x75 N3.75x75
Qty Qty
THA50414620.465.38.69.82.7
THA100414620.465.38.69.82.7

Installation

Installation

Installation

2 Installation Configrations :

  • Face Fix - Straps fixed to face of supporting timber.  Face nailing only
  • Wrap Over - Straps folded over top of supporting member.  Face and Top Nailing.

Contact

Simpson Strong-Tie U.K.

Simpson Strong-Tie

Cardinal Point, Winchester Road
Tamworth
Staffordshire
B78 3HG
United Kingdom