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CJT Concealed Joist Tie

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Product Details
CJT3ZS
CJT3ZS
CJT4ZS
CJT4ZS
CJT5ZS
CJT5ZS
CJT6ZS
CJT6ZS
CJT5ZS Illustration
CJT5ZS Illustration
CJTZ Steel Dowel
CJTZ Steel Dowel
CJT_Inst_STEP01
CJT_Inst_STEP01
CJT_Inst_STEP02
CJT_Inst_STEP02
CJT_Inst_STEP03
CJT_Inst_STEP03

The CJT Concealed Joist Tie is part of our concealed structural connector range, which combines structural strength with invisibility. The CJT offers tested performance in a joist connection with a clean, concealed look. Designed for versatility as well as hidden beauty, the CJT allows the joist to be angled up to 45° up or down with no reduction in load. It is part of a concealed connector system that includes the CBT and CPT.

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

Material

Carbon Steel 2.7mm thick

Finish

ZMAX® Galvanised

Features & Benefits
  • Manufactured in heavier gauge steel for a stronger connection
  • Can be installed three ways: with no routing of the header/post or beam (for a quicker installation) or with the header/post or beam routed for a flush look
  • Joists can be sloped up to 45° angle with full table loads
  • This connector can be used for end of header joists or corner connections
  • Tested and load-rated engineering data available
  • Suitable for Glulam and solid sawn timber
  • All pins and fasteners needed for installation are included
Installation
  • Use all specified fasteners
  • The CJT Kit comes complete with 70mm dowels and Simpson Strong‑Tie® Strong‑Drive® 6.4mm x 76mm Heavy‑Duty Connector screws. Screws require a hex‑head driver
  • Router end of beam for screw heads for flush installation
  • The carried member may be sloped up or down to 45° with full table loads
  • To provide maximum beam width for use with short dowels, centre in beam
  • Note: This connector requires special attention to ensure correct installation. The beam must be installed perpendicular to the support member. The connection's components may be damaged if the beam is rotated from its opposite end during or after installation. Damaged components may not be noticeable and may reduce the connector's load carrying capacity
Model No. Table

Model No.

Min. Joist Size

Dimensions (mm)

Fasteners

Design Capacity (kN)

H1

H2

Post
(No. – Length x Dia., mm)

Joist Pins5
(No. – 12 x 70 or 120 mm)

Uplift
k1 = 1.14

Download

Floor
k1 = 0.69

Roof
k1 = 0.77

CJT3ZS

85 x 150

141

113

6 – SDS6.4 x 76

3

2.9

6.86

6.86

85 x 190

141

113

6 – SDS6.4 x 76

3

4.74

8.43

8.43

CJT4ZS

85 x 230

178

151

8 – SDS6.4 x 76

4

7.24

13.22

13.22

CJT5ZS

85 x 290

217

189

10 – SDS6.4 x 76

5

9.47

19.12

19.12

CJT6ZS

85 x 290

254

227

12 – SDS6.4 x 76

6

12.08

22.00

22.00
  1. Design Capacity is the lesser of (1) the Characteristic Capacity multiplied by the Australian Capacity Factor, and applicable the k modification factors following AS 1720.1 and (2) the Serviceability Capacity which is the load at 3.2mm joint slip. Design Capacity is the minimum of test data and structural joint calculation
  2. The Capacity Factor (φ) is 0.85 for nails and screws for structural joints in a Category 1 application. Reduce tabulated values where other Category applications govern.
  3. Duration of Load Factor (k1) is as shown. Reduce Duration of Load Factor where applicable. Capacities may not be increased.
  4. Timber species for joint design is seasoned Radiata Pine, which is Australia Joint Group JD4 per AS 1720.1 Table H2.4.
  5. Centre dowel in beam. Short dowel (70 x 12mm) for use with a timber member with a breadth of 85mm
 
Brochures & Catalogues

Brochures and Catalogues

PDF icon Flyer - CJT Concealed Joist Tie
Installation Guides

Installation Guides

PDF icon CJT Installation Guides
Technical Data & Docs

Technical Data Sheets

PDF icon Technical Data Sheet - CJT

Report Links

ER-102
ER-280
FL10865

Warranty

Warranty

CAD Library

Download

jpg: 
Image icon CJT_Detail_Beam-to-Post.jpg
dxf: 
Binary Data CJT_Detail_Beam-to-Post.dxf
dwg: 
File CJT_Detail_Beam-to-Post.dwg
PDF: 
PDF icon CJT_Detail_Beam-to-Post.pdf

Download

jpg: 
Image icon CJT_Detail_Joist-to-Beam.jpg
dxf: 
Binary Data CJT_Detail_Joist-to-Beam.dxf
dwg: 
File CJT_Detail_Joist-to-Beam.dwg
PDF: 
PDF icon CJT_Detail_Joist-to-Beam.pdf

Download

jpg: 
Image icon CJT_Detail_Rafter-to-Ridge Beam.jpg
dxf: 
Binary Data CJT_Detail_Rafter-to-Ridge Beam.dxf
dwg: 
File CJT_Detail_Rafter-to-Ridge Beam.dwg
PDF: 
PDF icon CJT_Detail_Rafter-to-Ridge Beam.pdf

Download

jpg: 
Image icon CJT-CBT_Detail_Concealed Corner.jpg
dxf: 
Binary Data CJT-CBT_Detail_Concealed Corner.dxf
dwg: 
File CJT-CBT_Detail_Concealed Corner.dwg
PDF: 
PDF icon CJT-CBT_Detail_Concealed Corner.pdf

Download

jpg: 
Image icon CJT_3D.jpg
RFA: 
Binary Data CJT4ZS_3d_Cad.rfa
Package icon Download Full Set (6.03 MB)
Alternative Products

Alternative Products

E5_Reinforced Angle Bracket

E5 Reinforced Angle Bracket

E5 Reinforced Angle Bracket is suitable for structural applications in framing and timber-frame houses for general connecting of timber at 90° angles. Typical applications include fixing trusses, studs, purlins, beams and posts.

A35

A35 Reinforced Angle Bracket

The versatile A35 Reinforced Angle Brackets provide a way to make a straight angle of 90° connection. The A35 Angle Bracket’s exclusive bending slot allows instant, accurate field bends for two and three-way ties.

Inspiration

Inspiration

CJT_Application_01.jpg

CJT_Application_02.jpg

CJT_Application_03.jpg

CJT_Application_04.jpg

Request a Demo

Request a Demo/Sample*

Experience the innovation of Simpson Strong-Tie 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 provide you a demo and/or send you samples*.

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Request a Demo/Sample*

Experience the innovation of Simpson Strong-Tie 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 provide you a demo and/or send you samples*.

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