The Simpson 9/16-in. Wire Hole-Cleaning Brush Head is purpose-built for cleaning drilled holes prior to adhesive anchor installation, ensuring the bore is properly prepped for a strong, reliable bond. Engineered by Simpson for use with SET-3G and AT-3G adhesives, this brush head delivers thorough hole cleaning with fewer brush strokes at embedments up to 20 times the anchor diameter - making it a dependable choice for demanding anchoring applications where surface prep directly affects performance.

Key Features

• 9/16-in. brush head sized for 9/16-in. drilled holes - matches the hole diameter precisely, so the brush makes full contact with the bore wall for consistent, effective cleaning on every stroke.
• Designed for use with 1/2-in. anchors - the correct sizing relationship between anchor and hole diameter means this brush integrates cleanly into your existing anchoring workflow without guesswork.
• Compatible with Simpson SET-3G and AT-3G adhesives - engineered specifically around these two adhesive systems to support the prep requirements their installations demand.
• Cleans effectively with fewer brush strokes at embedments up to 20 times the anchor diameter - reduces the effort and time spent on hole prep without compromising the cleanliness required for a proper adhesive bond.
• 5-in. useable brush length, extendable with optional handle and extension - the 5-in. brushing surface covers meaningful depth, and total usable reach can be increased by adding the T-handle and any optional extension to suit your embedment depth.
• T-handle sold separately (model ETBS-TH) - required for use with all standard wire brush sizes, so you can pair the brush head with the appropriate handle for your setup without being locked into a bundle you don't need.

Why This Product

• Built to match the adhesive, not just the hole - because this brush is designed specifically for Simpson SET-3G and AT-3G adhesive systems, it supports the exact hole-cleaning standard those products require, helping protect the integrity of your anchored connections.
• Fewer strokes, same thorough clean - the brush geometry is engineered to permit proper hole cleaning with fewer brush strokes, reducing installation time and operator effort without cutting corners on prep quality.
• Handles deep embedment applications - with support for embedments up to 20 times the anchor diameter and the ability to extend total reach using optional handles and extensions, this brush head is suited to both shallow and deeper anchoring situations.
• Precise fit means no improvising on the job - a brush head sized specifically for a 9/16-in. hole and a 1/2-in. anchor eliminates the risk of using an ill-fitting brush that leaves debris behind and compromises your adhesive anchor installation.

Specifications

• MPN: ETB56S
• Brand: Simpson Strong-Tie
• Brush Head Diameter: 9/16 in.
• Hole Diameter: 9/16 in.
• Anchor / Bolt / Rod Diameter: 1/2 in.
• Useable Brush Length: 5 in.
• Material: Combination
• Packaging: Packs of 1 and Cartons of 25

Approved Applications

• Cleaning drilled holes prior to adhesive anchor installation
• Use with Simpson Strong-Tie SET-3G high-strength epoxy adhesive
• Use with Simpson Strong-Tie AT-3G high-strength hybrid acrylic adhesive
• Applications requiring embedments up to 20 times the anchor diameter

Frequently Asked Questions

What anchor diameter is this brush head designed for?

This brush head is designed for use with 1/2-in. diameter anchors and is sized to clean a 9/16-in. diameter drilled hole.

Which adhesives is the ETB56S compatible with?

The ETB56S wire brush head is specifically designed for use with Simpson Strong-Tie SET-3G and AT-3G adhesives to permit proper hole cleaning with fewer brush strokes at embedments up to 20 times the anchor diameter.

Is a T-handle included with this brush head?

No. The T-handle (model ETBS-TH) is required for use with all sizes of standard wire brush but is sold separately. Extensions and brushes are also sold separately.

What is the useable brush length of the ETB56S?

The ETB56S has a 5-in. useable brush length. To determine the total usable length of your setup, add the usable length of the brush, the handle, and any optional extension used together.

Related Products

• SET-3G
• AT-3G

Note: Product dimensions and/or length may differ from picture. Please see the item description above for specifications.