The Simpson Strong-Tie SDS-Plus Fixed-Depth Drill Bit for 1/4 in. Drop-In Anchors is engineered to take the guesswork out of anchor hole preparation when installing 1/4 in. Drop-In anchors in concrete. Sized at 3/8 in. diameter with a fixed drilling depth of 1-1/16 in., this bit is precisely matched to the hole dimensions required by Simpson Strong-Tie DIA and DIAB Drop-In anchors, delivering repeatable, correctly dimensioned holes in normal-weight concrete, sand-lightweight concrete, and hollow-core concrete.

Key Features

• Fixed drilling depth - automatically stops the bit at the exact depth required for 1/4 in. Drop-In anchor installation, removing guesswork and helping ensure every hole meets installation requirements consistently.
• SDS-Plus shank - locks positively into SDS-Plus rotary hammer drills for a secure, efficient connection during high-impact concrete drilling, reducing bit slippage and improving productivity.
• Precision sizing for DIA and DIAB anchors - the 3/8 in. diameter and 1-1/16 in. depth are matched specifically to Simpson Strong-Tie 1/4 in. Drop-In anchors, helping ensure proper anchor seating and load transfer.
• Broad concrete substrate compatibility - approved for use in normal-weight concrete, sand-lightweight concrete, and hollow-core concrete, making this bit a versatile tool across a range of common construction applications.

Why This Product

• Eliminates depth measurement errors - the fixed-depth stop produces a consistently sized anchor pocket every time, reducing rework and supporting code-compliant installations when setting Drop-In anchors.
• Designed as a matched system with Simpson Strong-Tie Drop-In anchors - using the bit specified by the anchor manufacturer helps ensure the hole geometry supports the full performance of DIA and DIAB anchors rather than relying on a generic bit that may produce an imprecise fit.
• SDS-Plus compatibility streamlines tool setup - works directly with the SDS-Plus rotary hammers already common on concrete job sites, so no additional adapters or specialized equipment are needed to prepare anchor holes.
• Versatile across multiple concrete types - approved for normal-weight, sand-lightweight, and hollow-core concrete substrates, this bit covers a wide range of structural and architectural concrete anchoring scenarios with a single tool.

Specifications

• Model Number (MPN): MDPL037DIA
• Brand: Simpson Strong-Tie
• Shank Type: SDS-Plus
• Bit Diameter: 3/8 in.
• Drilling Depth: 1-1/16 in.
• For Anchor Diameter: 1/4 in.
• Compatible Anchors: Drop-In Anchor (DIA, DIAB)
• Country of Origin: Germany

Approved Applications

• Drilling anchor holes in normal-weight concrete
• Drilling anchor holes in sand-lightweight concrete
• Drilling anchor holes in hollow-core concrete
• Preparing anchor sites for Simpson Strong-Tie 1/4 in. Drop-In anchors (DIA and DIAB)

Frequently Asked Questions

What anchors is the MDPL037DIA drill bit designed to work with?

This fixed-depth drill bit is specifically designed to prepare anchor holes for Simpson Strong-Tie 1/4 in. Drop-In anchors, including both the DIA and DIAB model anchors.

What are the drilling dimensions produced by this bit?

The MDPL037DIA produces a hole with a diameter of 3/8 in. and a fixed drilling depth of 1-1/16 in. - dimensions precisely matched to the installation requirements of the 1/4 in. Drop-In anchor.

What type of shank does this drill bit use, and what tools are compatible?

This drill bit features an SDS-plus shank, which is compatible with standard SDS-plus rotary hammer drills. The SDS-plus connection provides a secure, positive lock during drilling for efficient concrete penetration.

What concrete types can this bit be used in?

The MDPL037DIA is suitable for use in normal-weight concrete, sand-lightweight concrete, and hollow-core concrete substrates when installing Simpson Strong-Tie Drop-In anchors.