Simpson Strong-Tie 3/8" x 3" Hex-Head Sleeve-All Anchor is a pre-assembled, expanding sleeve anchor engineered for reliable fastening into solid base materials such as concrete and masonry. Manufactured from carbon steel with a zinc-plated finish, this hex-head anchor delivers secure, load-bearing performance across a broad range of structural and general construction applications - from heavy-duty infrastructure work to demanding DIY projects. The pre-assembled design simplifies installation, allowing fasteners to be set quickly and consistently without additional component management on the job site.

Key Features

• 3/8" anchor diameter with matching 3/8" drill bit requirement - the drill bit and anchor size align perfectly, so you can bore and set the anchor in one straightforward step with no guesswork about hole sizing.
• Hex head style with 1/2" wrench size - the hex head allows full torque to be applied using a standard 1/2" wrench, giving installers confident, secure tightening even in tight or overhead positions.
• 5/16" bolt/rod diameter at 18 TPI - the coarse 18 threads-per-inch pitch provides strong thread engagement and resistance to loosening under vibration or dynamic loading.
• Zinc-plated carbon steel construction - the zinc plating provides a corrosion-resistant barrier over the carbon steel body, extending the service life of the anchor in typical indoor and protected construction environments.
• Pre-assembled expanding sleeve design - the sleeve expands against the walls of the drilled hole as the bolt is tightened, creating a mechanical interlock that anchors firmly in solid base materials without the need for adhesives.
• Maximum fixture thickness of 1-1/2" - accommodates structural members, brackets, and hardware up to 1-1/2" thick, providing flexibility for a wide variety of attachment scenarios.

Why This Product

• The pre-assembled sleeve-and-bolt configuration means there are no loose parts to manage on site - drop the anchor into the hole, tighten, and the job is done, saving installation time and reducing the risk of assembly errors.
• The hex head and standard 1/2" wrench size make these anchors compatible with common hand tools and power wrenches, so no specialty tooling is required to achieve a properly torqued installation.
• Designed specifically for solid base materials including concrete and masonry, this expanding anchor creates a mechanical interlock that holds firmly under structural loads - making it a dependable choice for brackets, equipment pads, ledgers, and similar fixed attachments.
• The zinc-plated finish over carbon steel offers a practical balance of corrosion resistance and strength for protected interior and covered exterior applications where a durable, long-lasting anchor connection is needed.

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.): 1 1/2
• Material: Carbon Steel
• Coating: Zinc Plated
• Finish: Zinc Plated
• Color: None
• Measurement Unit: Pack
• Country of Origin: China

Available Pack Options

• SL37300HP1: 1 Ea
• SL37300H: 50 Pk
• SL37300H -4: 200 Pk

Frequently Asked Questions

What type of base materials are these Sleeve-All anchors designed for?

These expanding sleeve anchors are designed for use in all types of solid base materials. According to Simpson Strong-Tie, their mechanical anchors are engineered for installation into materials including concrete and brick, making them well-suited for structural and general fastening applications in solid masonry substrates.

What drill bit size do I need to install the 3/8" Sleeve-All anchor?

You will need a 3/8" drill bit to prepare the hole for this anchor. The drill bit diameter matches the anchor diameter exactly, ensuring a proper fit and full sleeve expansion when the bolt is tightened.

What wrench size is required to tighten the hex head on this anchor?

A 1/2" wrench is required to drive and tighten the hex head of this anchor. This is a common wrench size compatible with standard hand tools and impact wrenches typically found on construction sites.

What is the maximum fixture thickness this anchor can accommodate?

This 3/8" x 3" Sleeve-All anchor accommodates a maximum fixture thickness of 1-1/2 inches. This means the material being fastened - such as a bracket, plate, or structural member - must be no thicker than 1-1/2" to allow the anchor to engage properly and achieve its rated holding performance in the base material.

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