Simpson Strong-Tie 3/8" x 1-7/8" Hex-Head Sleeve-All Anchor is a pre-assembled expanding sleeve anchor engineered for secure, reliable fastening in solid base materials such as concrete and brick. Designed by Simpson Strong-Tie, a trusted name in structural fastening solutions, this zinc-plated carbon steel anchor delivers consistent holding strength across a wide range of construction and installation applications. The hex head configuration accepts a standard 1/2" wrench, making installation straightforward whether you're tackling a demanding infrastructure project or a hands-on DIY job.

Key Features

• Hex head style - accepts a 1/2" wrench for fast, tool-friendly tightening without slippage during installation
• Pre-assembled expanding sleeve design - arrives ready to install, reducing setup time and ensuring consistent anchor expansion in solid base materials
• 3/8" anchor diameter with 3/8" drill bit requirement - drill bit size matches the anchor diameter exactly, so there's no guesswork when preparing your substrate hole
• 5/16" bolt/rod diameter with 18 TPI threading - provides a firm, precise thread engagement for stable load transfer in structural and general fastening applications
• Zinc-plated carbon steel construction - the protective zinc coating adds corrosion resistance for use in typical indoor and sheltered environments, extending anchor service life
• Maximum fixture thickness of 3/8" - clearly defined clamping range helps you verify fitment before installation, reducing the chance of field errors
• Available in multiple head styles including acorn, rod coupler, and flat head - the Sleeve-All product family accommodates a wide variety of connection and appearance requirements

Why This Product

• The pre-assembled sleeve eliminates field assembly steps - everything is ready to drive straight into your drilled hole in concrete or brick, saving time on repetitive fastening tasks
• The zinc-plated finish on carbon steel provides a cost-effective corrosion barrier, making this anchor a practical choice for interior concrete anchoring where bare metal would be unsuitable
• The 3/8" drill bit diameter matches the anchor body directly - no upsizing or adapter needed, which simplifies tool preparation and reduces the risk of an oversized hole that could compromise holding strength
• Simpson Strong-Tie's Sleeve-All line is engineered for use across all types of solid base materials, giving you flexibility to use the same anchor specification across concrete and masonry substrates on a single job

Specifications

• Brand: Simpson Strong-Tie
• Diameter (in.): 3/8
• Bolt/Rod Diameter (in.): 5/16
• Drill Bit Diameter (in.): 3/8
• Head Type: Hex Head
• Wrench Size (in.): 1/2
• TPI: 18
• Max. Fixture Thickness (in.): 3/8
• Material: Carbon Steel
• Coating: Zinc Plated
• Finish: Zinc Plated
• Country of Origin: China

Available Pack Options

• SL37178HP1: 1 Ea
• SL37178H: 50 Pk
• SL37178H -5: 250 Pk

Frequently Asked Questions

What drill bit size do I need to install this anchor?

You need a 3/8" drill bit. The required drill bit diameter matches the anchor body diameter exactly at 3/8", so no upsizing or special tooling is needed beyond a standard 3/8" masonry or concrete bit appropriate for your base material.

What wrench size is needed to tighten the hex head?

A 1/2" wrench is required to drive and tighten this hex-head anchor. The hex head style allows you to apply full torque with a standard combination wrench or socket, making installation efficient even in repetitive fastening scenarios.

What is the maximum fixture thickness this anchor can accommodate?

The maximum fixture thickness is 3/8". It is important to verify that the material you are anchoring through does not exceed this measurement to ensure proper sleeve expansion and full clamping engagement within the base material.

What base materials is this Sleeve-All anchor designed for?

Sleeve-All expanding anchors are designed for use in all types of solid base materials, including concrete and brick. They are not intended for hollow base materials - for those applications, a different anchor type would be appropriate.

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