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MPB44Z Illustratiion
MPB44Z Illustratiion
MPB44Z Illustratiion
MPB44Z Illustratiion

The MPB Moment Post Base is specifically designed to provide moment resistance for timber columns and posts. With its innovative sleeve design, the patent-pending MPB encapsulates the post and keeps it from rotating at its base when lateral loads are applied at the top. This provides both the specifier and the contractor with greater design options and the opportunity to reduce the need for bracing, creating more unobstructed views. 

This innovative off-the-shelf solution has been engineered and tested to save specifiers and contractors the time and expense involved in designing, calculating and ordering custom-fabricated parts.  

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


Carbon Steel 2.7mm thick


ZMAX® Galvanised 

Features & Benefits
  • Suits 90mm x 90mm post
  • One-piece design simplifies installation and no additional bracing needed
  • Additional holes provided to attach trim material
  • Weep hole provided for water drainage
  • Tabs inside the MPB provide 25mm post standoff to help prevent rot from standing water and ground moisture
  • Stamped indicators and internal tabs identify the required concrete embedment depth
  • Use all specified fasteners 
  • Install MPB44Z before concrete is placed using embedment level indicators and form board attachment holes
  • Place post on tabs 25mm above top of concrete
  • Install Strong-Drive® SDS Heavy-Duty Connector screws, which are supplied with the MPB44Z (Coach screws will not achieve the same load)
  • Concrete level inside the part must not exceed 6mm above embedment line to allow for water drainage
  • Annual inspection of connectors used in outdoor application is advised. If significant corrosion is apparent 
  • or suspected, then the wood, fasteners and connectors should be evaluated by a qualified engineer or inspector
Model No. Table

Model No.

Post Size (mm)

Dimension (mm)

(No. – Length x Dia., mm)

Concrete Anchorage (kN)

Timber (kN)

Download (kN)

Cracked / Non-Reinforced Concrete




k1 = 1.0

Lateral F1

k1 = 1.0

k1 = 1.0

Lateral F1
k1 = 1.0

Moment M (kNm)
k1 = 1.0

k1 = 0.8


90 x 90



16 - SDS6.4 x 64







  1. Design Capacity is the lesser of (1) the Characteristic Capacity multiplied by 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 test data and structural joint calculation.
  2. For NZ, the Strength Reduction Factor (φ) is 0.80 for nails in lateral loading.
  3. Duration of Load Factor (k1) is as shown. Reduce Duration of Load Factor (k1) 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 and New Zealand Joint Group J5 per NZS 3603 Table 4.1.
  5. Higher download can be achieved by solidly packing grout in the 1” standoff area before installation of the post. Allowable download shall be based on either the wood post design or the concrete design calculated per code.
  6. Concrete shall have a minimum compressive strength of f’c = 17Mpa
  7. Foundation design (size and reinforcement) by Designer.
  8. Design Capacity shall be the lesser of the wood assembly or concrete design capacity. To achieve full wood assembly moment design capacity, additional concrete design and reinforcement by Designer is required.
  9. For loading simultaneously in more than one direction, the Design Capacity must be evaluated using the following equation: (Uplift / Design Uplift Capacity, or Download / Design Download Capacity) + (Moment / Design Moment Capacity) + (Lateral / Design Lateral Capacity) ≤ 1.0.
Brochures & Catalogues
Installation Guides

Installation Guides

PDF icon MPB Installation Guides
Technical Data & Docs

Technical Data Sheets

PDF icon Technical Data Sheet - MPB

Report Links



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.


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.

Request a Demo

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.

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 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.