The Simpson DIA37S DIAS Short Drop-In Internally Threaded Anchor by Simpson is a flush-mount expansion anchor engineered for concrete applications where shallow embedment is critical. Its short DIAS profile is purpose-built to reduce the risk of drilling into rebar or pre-stressed and post-tensioned cables, delivering reliable 3/8-in. rod connections in sensitive concrete installations without sacrificing installation consistency or load integrity.

Key Features

• Flush-mount design for concrete applications - sits level with the surface for a clean, unobtrusive finish in threaded rod and insert applications
• Lipped edge eliminates the need for precisely drilled hole depth - reduces prep time and the margin for error during installation, so work proceeds faster without sacrificing anchor performance
• Short length enables shallow embedment - helps avoid drilling into rebar or pre-stressed and post-tensioned cables, making this anchor a smart choice for reinforced concrete where full-depth drilling is not practical
• Compatible setting tool included with short drop-in anchors - ensures consistent, repeatable installation across every anchor in the pack, reducing the chance of improper setting
• Zinc-plated carbon steel construction - provides a corrosion-resistant finish suited to standard interior concrete anchoring environments
• Caution - oversized holes will make it difficult to set the anchor and will reduce load capacity - always use the specified 1/2-in. drill bit diameter to maintain full holding strength

Why This Product

• Built for rebar-sensitive concrete work - the short DIAS profile is specifically designed to limit embedment depth, reducing the risk of striking rebar or pre-stressed and post-tensioned cables that a standard-length drop-in anchor might reach
• Forgiving installation without sacrificing precision - the lipped edge means the hole does not need to be drilled to an exact depth, cutting setup time while still delivering a secure, flush-mount connection
• Consistent results every time - the included setting tool is matched to this specific anchor size, so each anchor is driven to the correct expansion without guesswork or improvised tooling
• Trusted Simpson engineering in a specialized form factor - the DIAS short version brings the same internally threaded drop-in anchor reliability to applications where the standard DIA length simply is not appropriate, giving installers a purpose-matched solution rather than a workaround

Specifications

• MPN: DIA37S
• Material: Carbon Steel
• Coating / Finish: Zinc Plated
• Bolt/Rod Diameter (in.): 3/8
• Length (in.): 3/4
• Thread Length (in.): 1/4
• TPI: 16
• Drill Bit Diameter (in.): 1/2

What's Included

Each pack contains (100) Drop-In Internally Threaded Anchors, Short drop-in anchors with a compatible setting tool to ensure consistent installation.

Frequently Asked Questions

What is the difference between the DIA and DIAS versions of this drop-in anchor?

The DIA version is made from stainless steel, while the DIAS is the short version made from zinc-plated carbon steel. The DIAS features a lipped edge that eliminates the need for a precisely drilled hole depth, and its shorter length allows for shallow embedment to help avoid drilling into rebar or pre-stressed/post-tensioned cables.

What drill bit size is required for proper installation of the DIA37S?

A 1/2-in. drill bit diameter is required for installation. Caution: oversized holes will make it difficult to set the anchor and will reduce the anchor's load capacity.

What rod size is compatible with the DIA37S drop-in anchor?

The DIA37S is designed for use with a 3/8-in. rod. Minimum thread engagement should be equal to the nominal diameter of the threaded insert.

Does the DIA37S come with a setting tool?

Yes. Short drop-in anchors include a setting tool compatible with the anchor to ensure consistent installation.

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