ClarkDietrich · Foundation Connections
Holdown Plate (HDP)
Quote requiredClarkDietrich HDP holdown plates are designed for taller construction and higher tension loads; transferring the tension loads between floors or from structural members to the foundation embed plate (by others).
ClarkDietrich HDP holdown plates are designed for taller construction and higher tension loads; transferring the tension loads between floors or from structural members to the foundation embed plate (by others). The HDP holdown plates are pre-punched and available in six sizes that can be bolted or welded. They can be used for panelized construction or stick-built construction. They can also function as a weld attachment for brick shelf angles within CFS framing.
- Material
- A36 for 1/4" and 3/8" plate; A572 Gr50 for 1/2" plate
Description, photography, tables and documents as published by ClarkDietrich. Their product page ↗
Product Data & Ordering Information
6 codes. Every figure is ClarkDietrich's published data.| Product code | Packaging | Thickness | Width | Length | Holes per End | Submittal | |
|---|---|---|---|---|---|---|---|
| 300HDP025 | 250 | 1/4" | 3" | 24" | 2 | PDF ↗ | |
| 300HDP038 | 200 | 3/8" | 3" | 24" | 3 | PDF ↗ | |
| 300HDP050 | 100 | 1/2" | 3" | 30" | 4 | PDF ↗ | |
| 500HDP025 | 150 | 1/4" | 5" | 24" | 3 | PDF ↗ | |
| 500HDP038 | 100 | 3/8" | 5" | 24" | 4 | PDF ↗ | |
| 500HDP050 | 50 | 1/2" | 5" | 30" | 6 | PDF ↗ |
Codes are what ClarkDietrich publishes as available, not a promise of local stock — tell the desk the connection you have and we'll confirm what's on a shelf. A code with no sheet of its own can be generated from ClarkDietrich SubmittalPro ↗.
Installation
Field trimming, welding or drilling will be required when installing holdown plates. When trimming cold-formed steel, use a grinder or plasma cutter. No torch cutting. Clean all trimmed, cut, drilled and welded areas and paint with a zinc-rich (cold galvanize) paint. Endpost must align from level to level and holdown plates set flat on the post components before welding or bolting. Holdown plates are intended for tension loads and not tested for compression loads. Endposts with bearing gaps must have a structural shim installed for full compression load path. CD holdown plates can be welded or bolted, but a designer of record shall check the endpost connection capacity and provide a specific connection detail for each project. Welding to cold-formed steel endpost members shall be with 97 mil (50Ksi) minimum with a maximum weld size of 1/8" fillet. Welder shall be certified for sheet steel welding.
Documents
Served straight from ClarkDietrich so you always get the current revision. Each code's own submittal sheet is on its row in the table above.
- BIMBIM / Revit
- Holdown Plate Catalog PageCatalog page
- ASTM A36Document
- ASTM A572Document
- IRC R603.9.4.2Document
- SDS For ASTM A36 Steel Framing ProductsSafety data sheet
- SDS For ASTM A572 Steel Framing ProductsSafety data sheet
- AISI S100-16 (2020) w/S2-20Code report
- SDS For ASTM A1003 Steel Framing ProductsSafety data sheet
- AIA / CEUDocument
- CAD Details LibraryCAD detail
- Clip Express Product CatalogCatalog page
- Architectural SpecsSpecification
- CAD DetailsCAD detail
CAD Details
5 details for this connection, each published as a PDF to read and a DWG and DXF to draw with.
Ask About This Product
Answered from ClarkDietrich's own documents — the 5 sheets listed above — with the source and page behind every line.