The Simpson SSTB28 Anchor Bolt is an engineered structural anchor bolt from Simpson, purpose-built for maximum performance in holdown and Strong-Wall shearwall connections. Backed by extensive load capacity testing across many common structural installation scenarios, this 7/8 in. x 29-7/8 in. anchor bolt is code listed by ICC-ES under the 2012, 2015, 2018, and 2021 IBC and IRC - giving builders, engineers, and inspectors a verified, trusted solution for seismic and lateral-force-resisting applications in wood and residential construction.

Key Features

• Identification on the bolt head showing embedment angle and model - lets installers quickly confirm the correct bolt is in the right position, reducing costly placement errors in the field.
• Offset angle design - reduces side bursting forces in the concrete and provides more concrete cover, protecting structural integrity at the embedment zone.
• Rolled thread - delivers higher tensile capacity compared to cut threads, giving the connection greater strength where it matters most under load.
• Stamped embedment line - aids accurate placement during concrete pours so installers hit the correct embedment depth without guesswork.
• Suitable for monolithic and two-pour concrete applications - provides flexibility to work with different concrete placement methods on a single jobsite or across project types.

Why This Product

• Engineered specifically for holdown and shearwall use - unlike general-purpose anchor bolts, the SSTB28 was designed and tested for the exact demands of holdown anchor bolt installations and Simpson Strong-Wall shearwall connections, so design loads are known quantities rather than estimates.
• ICC-ES code listed across four code cycles - coverage under the 2012, 2015, 2018, and 2021 IBC and IRC means the bolt is ready for plan review and inspection without additional engineering justification in most jurisdictions.
• Built-in installation aids cut field errors - the combination of a stamped embedment line and head identification markings helps crews place and verify bolts correctly the first time, reducing rework during concrete placement.
• Domestically produced to ASTM F-1554, Grade 36 - meeting this recognized material standard ensures consistent mechanical properties and supports projects with domestic-content requirements.

Specifications

• Model Number: SSTB28
• Diameter: 7/8 in.
• Length: 29-7/8 in.
• Thread Length: 3-1/2 in.
• Material: ASTM F-1554, Grade 36
• Finish: Uncoated Steel
• Coating: None
• Country of Origin: United States
• Code Listing: ICC-ES listed under 2012, 2015, 2018, and 2021 IBC and IRC

Approved Applications

• Holdown anchor bolt installations
• Simpson Strong-Tie Strong-Wall shearwall connections

Frequently Asked Questions

What type of concrete applications is the SSTB28 suitable for?

The SSTB28 is suitable for both monolithic and two-pour concrete applications, providing versatility for a range of structural installation scenarios.

Are nuts and washers included with the SSTB28?

No. Nuts and washers for holdown attachment are not supplied with the SSTB; install standard nuts, couplers and/or washers as required.

What building codes cover the SSTB28?

The Simpson Strong-Tie SSTB anchor bolts are code listed by ICC-ES under the 2012, 2015, 2018, and 2021 IBC and IRC.

What advantage does the offset angle design provide?

The offset angle on the SSTB28 reduces side bursting forces in the concrete and provides more concrete cover, improving the structural integrity and performance of the installation.

Note: Product dimensions may differ from picture. Please see item description for specifications.