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MDCST Medium Duty Diaphragm Chord Strap Tie

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.

Key Features

  • Pre-punched screw holes speed fastener installation
  • High capacity reduces 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

Material

  • 14 ga.

Finish

  • Galvanized (G90)

Installation

  • Use all specified fasteners; see General Notes

Related Literature

Connectors, Fasteners & Anchors for Mass Timber Construction
C-C-MASSTIMBER24
A catalog featuring connectors, fasteners and anchors for mass timber and CLT construction solutions.
Catalog
Canadian Cross-Laminated Timber (CLT) Diaphragm Solutions
F-C-CLTDIACAN19
A flier providing product information about tested, load-rated surface splines and fasteners with Canadian limit states load tables for cross-laminated timber (CLT) and mass timber projects.
Flier
Canadian Tension Straps for Cross-Laminated Timber (CLT) Applications
F-C-CLTNSTCAN19
A flier featuring the new MDCST48 high-capacity strap with Canadian limit states load tables. Includes installation illustrations and tension straps and fasteners suitable for CLT applications.
Flier
Simpson Strong-Tie® Tension Straps for CLT Diaphragms and CLT Walls (ASD & LRFD Loads)
L-C-CLTTS24
Simpson 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.
Engineering Letter

Product Information Table

Fastener Production Information and Stuff & Things
Model No. Ga. W (in.) L (in.) Coating/Material Packaging Qty.
MDCST48 14 5 3/4 47 1/2 Zinc Galvanized, G90 1

Load Tables

Allowable Tension Loads

Model No. Ga. Dimensions (in.) Fasteners
(Total)		 Allowable Tension Loads (lb.)
W L DF/SP SPF/HF
(160) (160)
MDCST48 14 5 3/4 47 1/2 (44) 1/4" x 3" SDS 11,905 10,560
MDCST48
(Doubled/Overlapped)		 5 3/4 47 1/2 (88) 1/4" x 3" SDS 23,810 21,120
  1. Allowable loads have been increased for wind or seismic loading with no further increase allowed; reduce where other loads govern.
  2. If wood tends to split, consider predrilling holes with diameters not exceeding 0.75 of the nail diameter (2015/2018 NDS® 12.1.5.3). Use a 5/32 bit for Strong-Drive SDS Heavy-Duty Connector screws.
  3. Use half of the required fasteners in each member being connected to achieve the listed loads.
  4. Tension loads apply for uplift as well when installed vertically.
  5. Listed allowable tension loads are based on steel tension capacity of the strap.
  6. 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. Fill the fastener holes uniformly on both ends of the strap.

Floor-to-Floor Clear Span Table

Model No. CLT Plies Clear Span
(in.)		 Fasteners
(Total)		 Allowable Tension Loads (lb.)
DF/SP SPF/HF
(160) (160)
MDCST48 3 4 1/8 (36) 1/4" x 3" SDS 11,905 8,640
5 6 7/8 (36) 1/4" x 3" SDS 11,905 8,640
7 9 5/8 (32) 1/4" x 3" SDS 10,750 7,680
9 12 3/4 (28) 1/4" x 3" SDS 9,410 6,720
MDCST48
(Doubled/Overlapped)		 3 4 1/8 (72) 1/4" x 3" SDS 23,810 17,280
5 6 7/8 (68) 1/4" x 3" SDS 22,850 16,320
7 9 5/8 (64) 1/4" x 3" SDS 21,505 15,360
9 12 3/4 (56) 1/4" x 3" SDS 18,815 13,440
  1. Allowable loads have been increased for wind or seismic loading with no further increase allowed; reduce where other loads govern.
  2. If wood tends to split, consider predrilling holes with diameters not exceeding 0.75 of the nail diameter (2015/2018 NDS® 12.1.5.3).
    3. Use a 5/32" bit for Strong-Drive® SDS Heavy-Duty Connector screws.
  3. Use half of the required fasteners in each member being connected to achieve the listed loads.
  4. Listed allowable tension loads are based on steel tension capacity of the strap.
  5. 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. Fill the fastener holes uniformly on both ends of the strap.

Code Reports & Compliance

Drawings

PDF DWG DXF RFA IFC SAT

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