
The Simpson Strong-Tie CPT90Z concealed post base anchors a 90mm to 100mm square timber post to concrete while hiding the steelwork inside the post - no visible stirrup at the base.
Use it for pergolas, verandah posts and deck posts where a clean post-to-slab look matters. The blade slots into a kerf cut in the post and pins through, while the bolt-down base fixes to the slab. Zmax galvanising suits exterior exposure.
Simpson Strong Tie Concealed Post Base Suits 90mm to 100mm Square Posts is designed for secure support of square posts, enhancing durability and reducing decay.
The Simpson Strong Tie Concealed Post Base is engineered to accommodate 90mm to 100mm square posts, providing a robust solution for various construction applications. With a 25mm standoff height, it effectively minimizes the risk of decay at the post end. This product can be cast-in-place or retrofitted using adhesive or mechanical anchors, ensuring versatile installation options. Constructed from heavier gauge carbon steel and finished with ZMAX® Galvanised, it offers a strong connection while maintaining a clean, concealed appearance. The CPT is suitable for both Glulam and solid sawn timber, and it includes all necessary pins and fasteners for installation. The 90mm size is also available in 316 Stainless Steel for environments prone to corrosion, such as coastal areas.
| Dimensions (W x H x D) | 90mm x 146mm x 90mm |
| Weight | 0.95kg |
| Material | 2.7mm Carbon Steel with ZMAX® Galvanised Finish |
| Colour | Black |
| Model Number | CPT90Z |
| Volume/Size | 90mm |
Simpson Strong Tie Concealed Post Base Suits 90mm to 100mm Square Posts is a reliable choice for structural support.





