Choose the anchor system
Select an anchor approved for the base material, cracked or uncracked concrete as applicable, load direction, edge distances and spacing. Wedge, sleeve, screw, drop-in and adhesive anchors have different hole and setting requirements. Hole diameter, drilled depth and effective embedment are separate parameters.
Prepare the drilling and setting tools
Use the drilling method and bit diameter specified for the selected anchor. Check bit condition and sufficient working length. Prepare the specified cleaning equipment and setting tools; brush type, brush diameter, air pressure or vacuum system are product-dependent. Use a torque tool where the installation procedure requires it.
Install wedge anchors to their specification
Mark and scan the drilling position, then drill and clean to the anchor instructions. Confirm fixture thickness and available embedment, insert the specified anchor and apply the prescribed setting or tightening procedure. Do not reuse one torque or depth allowance across unrelated anchor models. Concrete screws and drop-in anchors require their own setting methods.
Prepare adhesive anchors and post-installed rebar
Check resin, rod or rebar compatibility, condition, temperature range and the permitted drilling method. Prepare the hole using the specified cleaning sequence. Follow the instructions for mixing, initial resin discharge, filling from the required position, insertion time and curing. Do not load the connection before the required cure is complete.
Check common installation problems
Check wrong bit diameter, insufficient depth, dust, damaged holes, unsuitable substrate and incorrect setting. If reinforcement or services obstruct the planned hole, resolve the location and method under the project plan before continuing. A worn bit requires condition and diameter checks; a spare anchor is not a calibrated hole gauge.
Follow the specified hole-cleaning procedure
Manual cleaning commonly combines blowing and brushing, but the equipment, sequence and number of repetitions follow the anchor instructions. Hollow drilling may reduce or omit separate cleaning only where the exact drill-bit, extractor and anchor or rebar system combination is permitted. Core-drilled holes can require separate cleaning or roughening provisions.
Verify installation before applying load
Record installation checks required by the project: hole dimensions, setting depth, torque where applicable, material condition and curing conditions. Testing and load acceptance follow the selected system and project specification. A hole looking clean or an anchor feeling tight is not a substitute for those requirements.
Manufacturer guidance on hole cleaning · Hollow drill bits and anchor preparation
Is the anchor diameter always the drill diameter?
No. Use the hole diameter specified for the particular anchor or post-installed rebar system.
How much deeper than the anchor should I drill?
Use the product’s specified drilled depth and effective embedment. There is no universal anchor-length-plus allowance for every system.
Can a hollow drill bit eliminate separate hole cleaning?
Only when the selected installation system permits the exact hollow bit, extractor and procedure under the actual conditions.
Fixed-Depth Stop Drill Bits
A size such as 6 × 27 mm means a 6 mm cutting diameter and a 27 mm specified stop depth. A 6 × 33 mm configuration keeps the diameter and changes the stop position. Overall length is a separate specification: two designs can have the same D and H but different shoulder-to-shank lengths. Do not calculate L from a universal H-plus-constant rule.
Use the drilling depth specified for the exact anchor model, substrate and installation method. Drilling depth and effective embedment are distinct dimensions; any bottom clearance follows that system’s instructions. For fixed-depth stop bits, match both hole diameter and specified drilling depth, then confirm the cutting-tip datum and shoulder contact surface.
Stop Drill Bit Diameter & Depth Matcher · Read the stop drill bit guide
