The Simpson SSTB20 anchor bolt is engineered for maximum performance as an anchor bolt for holdowns and Simpson Strong-Tie Strong-Wall shearwalls. Backed by extensive load capacity testing across many common applications, this structural anchor bolt is ICC-ES code listed under the 2012, 2015, 2018, and 2021 IBC and IRC, making it a trusted choice for wood-frame construction, shearwall anchoring, and foundation connections in both monolithic and two-pour concrete installations. Built from ASTM F-1554, Grade 36 steel with an uncoated finish, the SSTB20 combines precision design features that simplify installation and deliver reliable structural performance.

Key Features

• Bolt head identification showing embedment angle and model - lets installers quickly confirm the correct bolt and orientation on the job site, reducing costly placement errors.
• Offset angle design - reduces side bursting forces in the concrete and provides greater concrete cover, protecting structural integrity over the long term.
• Rolled thread construction - delivers higher tensile capacity compared to cut threads, giving the connection greater strength under load.
• Stamped embedment line - serves as a built-in installation guide so the bolt is set to the correct depth every time, without the need for separate measuring.
• Suitable for monolithic and two-pour concrete applications - offers flexibility across different foundation and construction methods, from single-pour slabs to staged pours.

Why This Product

• Code-listed confidence across multiple code cycles - ICC-ES listing under the 2012, 2015, 2018, and 2021 IBC and IRC means this anchor bolt meets the requirements inspectors and engineers look for, keeping projects on schedule and on budget.
• Purpose-built for holdowns and Strong-Wall shearwalls - designed and extensively tested specifically for these demanding structural anchoring applications, so buyers are not adapting a generic bolt to a critical connection.
• Installation-friendly design details - the stamped embedment line and head identification work together to reduce guesswork in the field, helping contractors set bolts accurately and efficiently.
• Versatile concrete placement compatibility - approved for both monolithic and two-pour concrete construction, this structural bolt adapts to a wide range of foundation types and project conditions without requiring a different product for each scenario.

Specifications

• Model Number (MPN): SSTB20
• Diameter: 5/8 in.
• Length: 21-5/8 in.
• Material: ASTM F-1554, Grade 36
• Finish: Uncoated Steel
• Coating: None
• Country of Origin: United States

Approved Applications

• Anchor bolt for holdowns in wood-frame construction
• Anchor bolt for Simpson Strong-Tie Strong-Wall shearwalls
• Monolithic concrete pour applications
• Two-pour concrete applications
• Applications requiring ICC-ES code-listed anchor bolt solutions under the 2012, 2015, 2018, and 2021 IBC and IRC

What's Included

• 1 x Simpson Strong-Tie SSTB20 Anchor Bolt (5/8 in. x 21-5/8 in.)

Note: Nuts and washers for holdown attachment are not supplied with the SSTB; install standard nuts, couplers and/or washers as required.

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

Frequently Asked Questions

What applications is the SSTB20 anchor bolt designed for?

The SSTB20 is designed for maximum performance as an anchor bolt for holdowns and Simpson Strong-Tie Strong-Wall shearwalls. Extensive testing has been done to determine the design load capacity when installed in many common applications, and it is ICC-ES code listed under the 2012, 2015, 2018, and 2021 IBC and IRC.

Is the SSTB20 compatible with both monolithic and two-pour concrete installations?

Yes, the SSTB20 is suitable for both monolithic and two-pour concrete applications, making it versatile for a range of concrete foundation and structural anchoring scenarios.

What material is the SSTB20 made from, and does it have a protective coating?

The SSTB20 is made from ASTM F-1554, Grade 36 steel and has no coating or finish applied - it is uncoated steel. The bolt features a rolled thread for higher tensile capacity compared to cut-thread alternatives.

Are nuts and washers included with the SSTB20?

No, nuts and washers for holdown attachment are not supplied with the SSTB20. Standard nuts, couplers, and/or washers should be installed as required for your specific application.