HDUE Heavy Duty Holdown

Product Tabs

Product Details

HDUE

HDUE Illustration

HDUE Washer

HDUE Obround Holes

HDUE Features

HDUE Washers & SDS

Simpson Strong-Tie provides a wide variety of holdown devices, all engineered and tested to perform and manufactured to the highest quality standards.

Designed as the direct replacement for our industry-leading HDU, the new HDUE closely matches its predecessor's overall physical dimensions and capacities. The HDUE provides exceptional overturning resistance for critical lateral force-resisting applications, including shear walls and braced wall panels in timber construction.

This innovative design delivers higher loads and faster installation. It is the ideal solution for shear walls in timber structures demanding superior capacities and enhanced stiffness.

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

HDUE9: Includes (1) HDU9 Holdown; (1) Crescent Washer; (16) SDS Connector Screws
HDUE13: Includes (1) HDU13 Holdown; (1) Crescent Washer; (23) SDS Connector Screws (It also includes an imperial nut, but not suitable for use in AU/NZ)
HDUE17: Includes (1) HDU17 Holdown; (1) Aluminium Washer; (28) SDS Connector Screws

Material

HDUE9: Carbon Steel 2.5mm thick
HDUE13: Carbon Steel 2.5mm thick
HDUE17: Carbon Steel 3.5mm thick

Finish

Z275 Galvanised

Features & Benefits

Pre-deflected seat and tension screws greatly improves stiffness and reduce deflection under load.
Angled fastening engages the screws in tension for higher load capacity, reducing the number of screws required.
Angled fastening tabs help drive fastener at a 45° angle, and offset holes on the second back plate block the fastener from being driven straight.
Overlapping back plate increases fastener strength and shear values, helping prevent studs splitting.
Optimized screw patterns reduce splitting at the stud ends and maximize individual fastener capacity.
Installs with Strong‑Drive SDS Heavy‑Duty Connector screws.

Installation

Check the Installation Guide from the product flyer
The HDUE requires no additional washer
The nut should be tightened another 1/3 to 1/2 a turn more with a hand wrench.

Applications

Designed for use in shearwalls and braced wall panels, as well as other lateral force resisting applications in residential and commercial timber construction.
HDUE is suited for retrofit or new construction projects.

Model No. Table

Model No.	Dimensions (mm)						Fasteners		Wall Framing Stud(s) (mm)⁷	Country	Design Tension Capacity (kN)	Stiffness Strap(N/mm)
	Strap Thickness	W	H	B	CL	SO	Anchor Hole Dia. (mm)	Post (Nails: No. - Length x Dia., Screws: No. - Dia. x Length, mm)
HDUE9-SDS3.5	2.5	76	442	109	37	38	22	(16) 6.4 x 90	(70 or 2/35) x 90	AU	k1 = 1.14	12,000
											34.54
									(90 or 2/45) x 90	NZ	k1 = 1.0	12,000
											30.3
									(135 or 3/45) x 90	AU	k1 = 1.14	12,000
											42.28
									(135 or 3/45) x 90	NZ	k1 = 1.0	12,000
											37.08
HDUE13-SDS3.5	2.5	76	586	109	37	38	26	(23) 6.4 x 90	(135 or 3/45) x 90	AU	k1 = 1.14	12,500
											53.4
									(135 or 3/45) x 90	NZ	k1 = 1.0	12,500
											46.84
									(180 or 4/45) x 90	AU	k1 = 1.14	15,500
											59.8
									(180 or 4/45) x 90	NZ	k1 = 1.0	15,500
											52.46
HDUE17-SDS4.5	3.5	76	708	132	49	38	26	(28) 6.4 x 114	(135 or 3/45) x 90	AU	k1 = 1.14	28,500
											73.54
									(135 or 3/45) x 90	NZ	k1 = 1.0	28,500
											64.51
									(135 or 3/45) x 140⁸	AU	k1 = 1.14	28,500
											83.94
									(135 or 3/45) x 140⁸	NZ	k1 = 1.0	28,500
											76.63
Design Capacity is the Characteristic Capacity multiplied by the Australian Capacity or NZ Strength Reduction Factor (φ), and applicable k modification factors following AS 1720.1 and NZS 3603. Design Capacity is the minimum of test data and structural joint calculation. For Australia the Capacity Factor (φ) is 0.8 for structural joints in Category 2 applications, and for New Zealand the Strength Reduction Factor (φ) is 0.8. Reduce tabulated values where other Capacity or Strength Reduction Factors govern. Duration of Load Factor (k1) is as shown. Reduce Duration of Load Factor where applicable. Capacities may not be increased. 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. The Designer must specify anchor bolt type, length and embedment. Anchor bolt nut should be finger tight plus ⅓ to ½ turn with a hand wrench. Care should be taken not to over‑tighten the nut. Number of total studs or post size to meet axial load demand, to be determined by the designer. Multiple studs connected independently of holdown fasteners. Noted HDUE17 design capacity is based on a 140mm wide post or stud (minimum), all other resistances assume a 90 mm wide post or stud (minimum). 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 – values in the table reflect installation into the wide face. 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 taken into account.

Brochures & Catalogues

Brochures and Catalogues

Flyer - HDUE Heavy Duty Holdown

Catalogue - Mass Timber Construction

Technical Data & Docs

Technical Data Sheets

Technical Data Sheet - HDUE

Report Links

ESR-2330

FL10441

Warranty

Alternative Products

HTT Tension Tie & Holdown

Simpson Strong‑Tie offers a wide variety of holdown devices designed and tested to address many applications and load demands.

DTT2 Tension Tie & Holdown

Simpson Strong‑Tie offers a wide variety of holdown devices designed and tested to address many applications and load demands. The DTT2 Tension Tie & Holdown is designed for lighter‑duty holdown applications on single or double studs.

Inspiration

HDUE_Application_01.jpg

HDUE_Application_02.jpg

Request a Demo

Request a Demo/Sample*

Structural Connections

Unmatched Quality from the Truss to the Foundation

With nearly 60 years of field and R&D experience, Simpson Strong-Tie^® timber connectors are manufactured to the industry's highest standards. From framing angles to straps to heavy-duty joist hangers, we offer the most diverse product line so that you have the right product for the job.

Simpson Strong-Tie^® connectors offer unmatched quality with laboratory and field testing, and are backed by our uncompromising commitment to customer service. As the company that built the connector industry, you can count on Simpson Strong-Tie^® to work closely with builders, engineers and building officials to deliver innovative, building code-compliant solutions to help build safer, stronger structures economically. Download the Structural Connectors Overview Flyer.

Timber Connectors

From testing to service to availability, everything we do is engineered to ensure your project's success. With every product, you know you are getting the quality, value, service and on-time delivery that we have built our reputation on for the past 60 years.

From straps and ties to joist hangers and much more, Simpson Strong-Tie^® structural connectors increase the strength and safety of timber-frame structures. Each connector is unique to Simpson Strong-Tie and is designed for specific applications without the need to adapt metal plating to suit a connection.

Steel Frame Connectors

From fully tested and engineered connectors and clips Simpson Strong-Tie^® provides comprehensive structural solutions for cold-formed steel construction. From steel-to-steel connections to full-scale lateral solutions and curtain wall connectors, we remain committed to developing new technology that helps to advance the cold-formed steel industry.

Find out how Simpson Strong-Tie timber connectors can help you build the right way every day. Download the Cold-Fromed Steel Construction Connectors Catalogue.

HDUE Heavy Duty Holdown