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CPT44Z
CPT44Z
CPT44Z
CPT44Z
CPT44SS Stainless Steel
CPT44SS Stainless Steel
CPT Illustration
CPT Illustration

The CPT Concealed Post Base Tie is part of our concealed structural connector range, which combines structural strength with invisibility. The CPT provides a clean, concealed look while providing a 25mm standoff height above concrete. The 25mm standoff reduces the potential for decay at the post end and satisfies code requirements for posts that are exposed to weather or water splash or are in basements. It is part of a concealed connector system that includes the CBT and CPT.

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

Material
  • CPTZ - Carbon Steel; CPTSS - 316 Stainless Steel
  • 2.7mm thick (base), 3.5mm thick (knife plate)
Finish
  • ZMAX® Galvanised: CPT90Z; CPT140Z; CPT200Z
  • 316 Stainless Steel: CPT90SS  
Features & Benefits
  • Manufactured in heavier gauge steel for a stronger connection
  • The post support blade can be used as a template for location to drill dowel holes
  • Black powder coated base for a modern appearance
  • Tested and load-rated engineering data available
  • Suitable for Glulam and solid sawn timber
  • It can be installed with either mechanical or chemical anchors (dependant on engineering specifications)
  • Available in a range of sizes to suit 90mm, 140mm and 190mm posts
  • The 90 mm size is also available in 316 Stainless Steel for for more corrosive environments such as coastal areas
  • All pins and fasteners needed for installation are included
Installation
  • Use all specified fasteners
  • Post bases do not provide adequate resistance to prevent members from rotating about the base and therefore are not recommended for non‑braced or non‑top‑supported installations
  • Anchorage Options: 
  • The holes in the CPT tabs are sized for 12mm diameter anchors
  • For cast‑in‑place anchors, there should be 22mm (±3mm)
  • of anchor above the top surface of the concrete
Model No. Table

Model No.

Post Size (mm)

W x H

Dimensions (mm)

Material
(mm)

Fasteners

Design Capacity (kN)

W

L

Base Thickness

Knife Plate Thickness

Anchor

Dowel

Qty

Dia.
(mm)

Qty

Dia. x L

Uplift
k
1 = 1.14

Download

F1
k
1 = 1.14

F2
k
1 = 1.14

Floor
k
1 = 0.69

Roof
k
1 = 0.77

CPT90Z

90 x 90
100 x 100

90

90

2.7

3.5

2

12

3

1/2" (12.7mm) x 70mm

13.5

47.5

53.0

2.7

3.4

CPT140Z

140 x 140
152 x 152

137

137

20.4

109

109

2.9

4.6

CPT200Z

190 x 190
203 x 203

184

184

17.5

114

114

3.3

4.8

CPT90SS6

90 x 90
100 x 100

90

90

12.7

47.5

53.0

2.3

3.6

  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. CPTZs are supplied with three 1/2 inch diameter steel dowels. Alternate 12 mm diameter hex or square head machine bolts may be substituted and will achieve table loads.
  6. CPTSS are supplied with three 1/2 inch diameter stainless steel dowels.
  7. Lag or carriage bolts are not permitted.
  8. 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.
  9. Downloads shall be reduced where limited by the capacity of the timber post.
Brochures & Catalogues
Installation Guides

Installation Guides

PDF icon CPT Installation Guides
Technical Data & Docs

Technical Data Sheets

PDF icon Technical Data Sheet - CPT

Report Links

Warranty

Warranty

CAD Library
Alternative Products

Alternative Products

ABU Adjustable Post Base

The ABU Adjustable Post Base provides a high‑strength connection between the post and concrete.

Inspiration
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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.

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.

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.