Simpson HD19 Bolted Holdown Anchor is a heavy-duty, high-capacity holdown connector engineered to develop high allowable loads in both vertical and horizontal applications within wood-frame construction. Installed with bolts directly into posts or columns, this holdown creates a secure, code-compliant connection between structural framing members and the foundation. The self-jigging design takes the guesswork out of field positioning, and when eccentricity is a concern, the HD19 can be installed back to back for a balanced, symmetrical connection. Built in the United States from 3-gauge steel with a 3/8 in. steel base and finished in Simpson Strong-Tie gray paint, this bolted holdown anchor is a trusted choice for contractors and engineers working on demanding structural tie-down applications.

Key Features

• High-capacity, low-deflection holdown design - delivers strong, rigid resistance to uplift and lateral forces, helping structures maintain integrity under demanding load conditions
• Self-jigging construction - automatically positions the connector to maintain the code-required minimum of seven bolt diameters from the end of the post when installed flush with the sill plate, reducing layout errors and keeping installations code-compliant without extra measuring
• Flexible installation options - can be installed flush with the sill plate or raised and installed off the sill plate, giving crews more adaptability across varying field conditions
• Back-to-back installation capability - when eccentricity is an issue, two units can be installed back to back for a symmetrical connection that minimizes eccentric loading on the post or column
• 3-gauge steel body with 3/8 in. steel base - heavy material construction provides the structural strength needed for high-load post and column connections in wood-frame buildings
• Simpson Strong-Tie gray paint finish - provides a protective coating suited to interior wood-frame construction environments and ensures a consistent, professional appearance
• Bolted installation with anchor bolt and stud machine bolts - connects securely to both the post or column and the foundation anchor, creating a reliable load path from the framing down to the foundation

Why This Product

• Engineered for both vertical and horizontal load transfer - the HD19 is specifically designed to handle high allowable loads in both directions, making it a versatile holdown solution for a wide range of wood-frame structural connections rather than a single-use fastener
• Self-jigging design reduces installation errors - the built-in self-jigging feature automatically ensures the code-required bolt spacing from the end of the post, saving time on layout and reducing the risk of non-compliant installations that require costly corrections
• Heavy-gauge steel construction supports demanding structural requirements - the 3-gauge steel body and 3/8 in. steel base deliver the material thickness and strength that high-load post and column connections in wood construction require
• Adaptable to eccentricity challenges and varied sill plate conditions - the ability to install the HD19 back to back or off the sill plate gives engineers and contractors practical solutions for real-world framing scenarios without requiring specialty hardware

Specifications

• Manufacturer Part Number (MPN): HD19
• Body Gauge: 3-gauge steel
• Base Thickness: 3/8 in. steel
• Coating / Finish: Simpson Strong-Tie Gray Paint
• Installation Fasteners: 1-1/8 in. or 1-1/4 in. anchor bolt and (5) 1 in. stud machine bolts (sold separately)
• Seat/Base Thickness: 4 in.
• Hole Bottom: 7 in.
• Width: 3-1/2 in.
• Height: 24-1/2 in.
• Seat Depth: 4-1/4 in.
• Centerline: 2-1/8 in.
• Screw Offset: 3-5/8 in.
• Country of Origin: United States

Approved Applications

• Vertical load transfer applications in wood-frame construction
• Horizontal load transfer applications in wood-frame construction
• Post and column connections requiring bolted holdown anchors
• Back-to-back installations where eccentricity is an issue
• Installations flush with the sill plate or raised off the sill plate

Installation

The Simpson HD19 is installed with bolts into posts or columns. The following fasteners are required for proper installation:

• Anchor bolt: 1-1/8 in. or 1-1/4 in. anchor bolt (1 required)
• Stud machine bolts: 1 in. stud machine bolts (5 required)

Frequently Asked Questions

What hardware is required to install the HD19?

The HD19 is installed with a 1-1/8 in. or 1-1/4 in. anchor bolt along with five 1 in. stud machine bolts, which connect the holdown to the post or column.

What are the dimensions and material specifications of the HD19?

The HD19 stands 24-1/2 in. tall and is 3-1/2 in. wide. It is constructed from 3-gauge steel for the body and features a 3/8 in. steel base, finished in Simpson Strong-Tie gray paint.

Can the HD19 be installed off the sill plate?

Yes. While the HD19's self-jigging design is optimized for flush installation with the sill plate - automatically maintaining the code-required minimum of seven bolt diameters from the end of the post - it may also be raised and installed off the sill plate when site conditions require it.

Can the HD19 be used when eccentricity is a concern?

Yes. The HD19 can be installed back to back when eccentricity is an issue, providing a balanced and symmetrical connection to help address eccentric load conditions in wood construction applications.