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ABU Adjustable Post Base
ABU Adjustable Post Base
ABU44Z Illustration
ABU44Z Illustration
ABU44 Stainless Steel
ABU44 Stainless Steel
ABU66Z
ABU66Z
ABU66 Stainless Steel
ABU66 Stainless Steel
ABU66Z Illustration
ABU66Z Illustration
ABU88Z
ABU88Z
ABU88Z Illustration
ABU88Z Illustration

The ABU Adjustable Post Base provides a high‑strength connection between the post and concrete. Designed to install on hardened concrete with either a cast‑in‑place or post‑installed anchor, the ABU is designed to provide strong uplift performance for areas where uplift from high winds is a concern. It's stand-off base keeps the timber away from standing moisture which is especially important when using laminated posts.

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

Material & Finish
  • Carbon Steel ZMAX® Galvanised: ABU44Z; ABU66Z; ABU88Z
  • 316 Stainless Steel: ABU44SS; ABU66SS 
Features & Benefits
  • The slotted base enables flexible positioning around the anchor bolt, making precise post placement easier
  • The 25mm standoff meets code requirements and helps prevent rot at the end of the post in applications where weather or moisture are present
  • ZMAX galvanisation offers extra corrosion resistance for exterior and preservative‑treated timber applications
  • Available in 316 Stainless Steel for more corrosive environments such as coastal areas
  • The post can be fastened with either nail, bolts or Strong‑Drive® SD Connector screws
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‑top supported installations (such as fences or unbraced carports)
Model No. Table

Model No.

Post Size (mm)

Material
(mm)

Dimensions
(mm)

Fasteners

Country

Design Capacity (kN)

Base Thickness

Strap Thickness

W

L

H

HB9

Anchor Dia (mm)

Nails
(No. – Length x Dia., mm)

Bolts
(No. – Dia., mm)

Uplift

Download10

Nails

Bolts

Floor

Roof

ABU44Z

90 x 90

1.6

2.7

90

75

140

45

16

12 – 75 x 3.75

2 – M12

AU

k1 = 1.14

k1 = 1.14

k1 = 0.69

k1 = 0.77

10.23

8.66

36.20

36.20

NZ

k1 = 1.0

k1 = 1.0

k1 = 0.80

k1 = 0.80

10.23

8.66

34.07

34.07

ABU66Z

140 x 140

2.7

3.5

140

125

155

45

16

12 – 75 x 3.75

2 – M12

AU

k1 = 1.14

k1 = 1.14

k1 = 0.69

k1 = 0.77

7.15

8.68

70.66

70.66

NZ

k1 = 1.0

k1 = 1.0

k1 = 0.80

k1 = 0.80

6.73

7.15

66.50

66.50

ABU88Z5

200 x 200

2.0

2.7

190

180

180

2 – 16

18 – 75 x 3.75

AU

k1 = 1.14

k1 = 1.14

k1 = 0.69

k1 = 0.77

10.36

129.91

129.91

NZ

k1 = 1.0

k1 = 1.0

k1 = 0.80

k1 = 0.80

9.75

122.27

122.27

ABU44SS

90 x 90

1.6

2.7

90

75

140

45

16

12 – 75 x 3.75

2 – M12

AU

k1 = 1.14

k1 = 1.14

k1 = 0.69

k1 = 0.77

7.05

6.48

38.74

38.74

NZ

k1 = 1.0

k1 = 1.0

k1 = 0.80

k1 = 0.80

6.64

6.48

36.46

36.46

ABU66SS

140 x 140

2.7

3.5

140

125

155

45

16

12 – 75 x 3.75

2 – M12

AU

k1 = 1.14

k1 = 1.14

k1 = 0.69

k1 = 0.77

11.15

11.81

68.89

68.89

NZ

k1 = 1.0

k1 = 1.0

k1 = 0.80

k1 = 0.80

10.96

11.81

64.84

64.84

  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 test data and structural joint calculation.
  2. For Australia, 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. For NZ, the Strength Reduction Factor (φ) is 0.80 for nails in lateral load and 0.70 for other fasteners.
  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 and New Zealand Joint Group J5 per NZS 3603 Table 4.1.
  5. ABU88Z may alternately be installed with eight Simpson Strong-Tie SDS 6.4 x 76mm Heavy-Duty Connector screws (sold separately) to achieve table loads.
  6. Specifier to design concrete for uplift capacity.
  7. 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. Fasteners should be installed in the wide face.
  8. Simpson Strong-Tie stainless-steel connectors require stainless-steel fasteners.
  9. HB dimension is the distance from the bottom of the post up to the first bolt hole.
  10. Downloads shall be reduced where limited by the capacity of the timber post.
Brochures & Catalogues
Installation Guides

Installation Guides

PDF icon ABU Installation Guides
Technical Data & Docs

Technical Data Sheets

PDF icon Technical Data Sheet - ABU

Warranty

Warranty

CAD Library
Alternative Products

Alternative Products

CPT44Z

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.

Inspiration
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 Structural Connectors Overview Flyer.

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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.