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MDCST Diaphragm Tension Strap

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MDCST48 Installation
MDCST48 Installation
MDCST48 Installation
MDCST48 Installation
MDCST48 Illustration
MDCST48 Illustration

Simpson Strong-Tie tested and load-rated tension straps and fasteners are designed to minimize cost and maximize speed and precision — while providing the strength, versatility and reliability you depend on. The MDCST48 is a 14-gauge high-capacity strap specifically designed to carry tension across a CLT floor or wall panel joint. The MDCST48 installs with Simpson Strong-Tie® Strong-Drive® SDS Heavy-Duty Connector Screws.

Material

Carbon Steel

Finish

Z275 Galvanised

Features & Benefits
  • Pre-punched screw holes speed fastener installation
  • High capacity eliminates the need for expensive shop-fabricated steel plates
  • Straps may be overlapped to reduce the physical space or footprint needed to transfer high loads across a panel joint
Applications
  • CLT Floor or Wall Panel Joint
  • Floor-to-Floor Tie Down
  • Diaphragm Tension Strap
Model No. Table
MDCST48 — Medium Duty Diaphragm Chord Strap Tie – Allowable Tension Loads

Model No.

Dimensions (mm)

Screws (Total)
(mm)

Country

Characteristic Tension
Capacity (kN)

Design Tension Capacity (kN)

Thickness

W

L

MDCST48

2

146

1,207

36 – SDS6.4x76

AU

62.1

55.9 (K1=1.14)

NZ

62.1

55.9 (K1=1.0)
  1. 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 3.2 mm joint slip. Design Capacity is the minimum of steel and structural joint calculation.  
  2. For Australia, the Capacity Factor (Φ) is 0.80 for nails and screws for structural joints in a Category 2 application. Change tabulated values where other Category applications govern. For NZ, the Strength Reduction Factor (Φ) is 0.80 for nails in lateral loading and 0.70 for other fasteners.
  3. Duration of Load Factor (k1) is as shown for wind and earthquake loading. Reduce Duration of Load Factor (k1) where applicable. Capacities may not be increased.
  4. The timber species design density for joint design is 480 kg/m3.
  5. If timber tends to split, consider pre-boring holes with diameters not exceeding 80% of the nail diameter (AS 1720.1 4.2.6). Use a 4 mm bit for Strong-Drive® SDS Heavy-Duty Connector screws.
  6. Use half of the required fasteners in each member being connected to achieve the listed loads.
  7. Tension loads apply for uplift as well when installed vertically.
  8. When using the MDCST48 as a single strap, fill only round holes. When using the MDCST48 as a double/overlapped strap, fill round and triangle holes. When strap is doubled, use double the tabulated loads and double the fasteners. 
  9. Screws: 6.07mm shank diameter x 76mm Long SDS Heavy Duty Connector Screws
 
Brochures & Catalogues

Brochures and Catalogues

PDF icon Flyer - MDCST Diaphragm Tension StrapPDF icon Catalogue - Mass Timber Construction
Technical Data & Docs

Report Links

ESR-2105

Warranty

Warranty

CAD Library

Download

jpg: 
Image icon MDCST48_Detail_Diaphragm_Chord_Tension_Across_CLT_Panel_Joint.jpg
dxf: 
Binary Data MDCST48_Detail_Diaphragm_Chord_Tension_Across_CLT_Panel_Joint.dxf
dwg: 
File MDCST48_Detail_Diaphragm_Chord_Tension_Across_CLT_Panel_Joint.dwg
PDF: 
PDF icon MDCST48_Detail_Diaphragm_Chord_Tension_Across_CLT_Panel_Joint.pdf

Download

jpg: 
Image icon MDCST48_Detail_Floor-to-Floor_Tie_Down_CLT_Installation.jpg
dxf: 
Binary Data MDCST48_Detail_Floor-to-Floor_Tie_Down_CLT_Installation.dxf
dwg: 
File MDCST48_Detail_Floor-to-Floor_Tie_Down_CLT_Installation.dwg
PDF: 
PDF icon MDCST48_Detail_Floor-to-Floor_Tie_Down_CLT_Installation.pdf

Download

jpg: 
Image icon MDCST48_3D.jpg
RFA: 
Binary Data MDCST48_3D_Cad.rfa
Package icon Download Full Set (3.25 MB)
Masterspec
Alternative Products

Alternative Products

MSTC78 Installation

MSTC Diaphragm Tension Strap

The MSTC is designed to resist tension loads in timber-to-timber applications. This diaphragm tension strap tie utilizes a staggered nail pattern to help minimize timber splitting.

LDSS48 installed with QD WSV75SA Collated Screws

LDSS Light Diaphragm Spline Strap for Mass Timber

The LDSS light diaphragm spline strap is designed to be placed directly on top of CLT (cross-laminated timber) and other mass timber panels to connect them together. Unlike plywood splines, the LDSS does not require routing.

Inspiration

Inspiration

MDCST48_Application.jpg

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Request a Demo/Sample

Experience the innovation design of Simpson Strong-Tie's products and how we can help you build safer, stronger structures. Please fill out your details and submit the form below. We’ll be in touch to schedule a time to talk and give you a personal demo of Simpson Strong-Tie products.

* Start typing address and select from the autocomplete.

Privacy policy

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 Timber Connectors NZS 3604 Catalogue.

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. Download the Timber Construction Connectors Catalogue (2016-2018).

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.