Drop-in anchors are internally threaded, deformation-controlled expansion anchors with a preassembled expander plug, suitable for flush mount applications in solid base materials. The anchor is set by driving the expansion plug towards the bottom of the anchor using the setting tool. Drop-in anchors are also available in coilthreaded versions for 1/2" and 3/4" coil threaded rod.
The Lipped Drop-In (DIAL) features a lip at the top of the anchor body that keeps the top of the anchor flush with the concrete. This eliminates the need for precisely drilled hole depths and allows for easier flush installation, consistent embedment and uniform rod lengths.
Short Drop-In anchors are for use in solid and hollow concrete. The short length permits shallow embedment that helps to avoid drilling into rebar or prestressing strands. The wide surface flange enables the Short Drop-In to be installed in deep or bottomless holes. Fixed-depth drill bits are also available to take the guesswork out of drilling to the correct depth for these 3/8" and 1/2" Short Drop-Ins. Using the fixeddepth bit drill bit prevents overdrilling, which saves time and prolongs bit life.
GALLERY: roll over images below to see larger image
MATERIAL
Carbon and stainless steel (DIA37S and DIA50S available in zinc-plated, carbon steel only)
FINISH
Carbon steel: Zinc plated.
INSTALLATION
For installation instructions, click here.
CODE REPORTS
Drop-In:- City of L.A. RR24682
- Factory Mutual 3017082
- Underwriters Laboratories File Ex3605
- Meets requirements
of Federal Specifications A-A-55614, Type I.
- Factory Mutual 3017082 & Underwriters Laboratories File Ex3605.
The load tables list values based upon results from the most recent testing and may not reflect those in current code reports. Where code jurisdictions apply, consult the current reports for applicable load values.
TEST CRITERIA
The Drop-In anchor has been tested in accordance with ICC-ES's Acceptance Criteria for Expansion Anchors (AC01) for the following:
- Seismic/wind loading
- Combination tension and shear loads
- Critical and minimum edge distance and spacing
SUGGESTED SPECIFICATIONS
Drop-In anchors shall be internally threaded, expanding shell anchors. The anchor shell shall be zinc plated carbon steel with a minimum 70,000 psi tensile strength, type 303 or 316 stainless steel, as called for on the drawings. Drop-In anchors shall meet Federal Specification A-A-55614, Type I. Anchors shall be Drop-In anchors from Simpson Strong-Tie, Pleasanton, CA. Anchors shall be installed following the Simpson Strong-Tie instructions for Drop-In internally threaded expansion shell anchors.
LINKS:
- Limited Warranty Information
- Product Data
- Tension and Shear Load Tables
- Load-Adjustment Factors
- Documents:
Anchor Catalog Section (PDF) - Short Drop-In Anchor flier (PDF)
- Anchoring Solutions for Mechanical, Electrical and Plumbing Trades flier (PDF)
- Material Safety Data Sheet (PDF)
- Material Safety Data Sheet en Español (PDF)
- Material Safety Data Sheet en Français (PDF)
- Free Software:
PRODUCT DATA
See product data — model numbers, rod size, bolt threads, drill bit diameter, etc.
Material Specifications
Note: DIA37S, DIA50C and DIA75C are not available in stainless steel.





