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MSTC Diaphragm Tension Strap

Model: MSTC78 Installation

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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. The high-capacity MSTC also features countersunk nail slots for a lower nailing profile.

Material

Carbon Steel

Finish

Z275 Galvanised

Features & Benefits
  • Load-rated, precut strap designed for quick installation and optimal performance
  • Loads have been increased for wind and seismic forces
  • Floor-to-floor clear span application
Applications
  • Floor-to-Floor Tie Down
  • Diaphragm Tension Strap
 
 
Model No. Table
MSTC78 — Medium Strap Tie with Countersunk Nail Slots

Model No.

Dimensions (mm)

Nails (Total)
(mm)

Country

Characteristic Tension
Capacity (kN)

Design Tension Capacity (kN)

Thickness

W

L

MSTC78

2

76

1,975

76 – 3.75x64

AU

15.1

13.6 (K1=1.14)

NZ

12.9

11.6 (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 3.2mm 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.
  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. See Straps and Ties General Notes.
  6. Fasteners: Nail dimensions in the table are listed diameter by length. For additional information, see Fastener Types and Sizes Specified for Simpson Strong-Tie Connectors.
 

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