| 1 | Headed Hex-Head Cast-In Bolt | Straight threaded shank with a forged or formed head embedded in concrete. | Positioned in fresh concrete using a template before the concrete sets. | New reinforced or plain concrete. | Tension, shear, and combined structural loads. | High reliability, positive mechanical anchorage, and good resistance to vibration when properly designed. | Requires accurate positioning before concrete placement; difficult to modify after curing. | Use for equipment bases, steel columns, structural frames, and other permanent concrete connections. |
| 2 | L-Bolt | Threaded rod with a 90-degree bent leg embedded in concrete. | Installed in fresh concrete with the bent leg providing mechanical embedment. | Concrete foundations, slabs, and masonry cores where permitted by design. | Moderate to high tension and shear, depending on diameter, embedment, edge distance, and concrete strength. | Simple, economical, and suitable for holding down plates and base frames. | Bend geometry can interfere with reinforcement; orientation and placement must be controlled. | Choose when cast-in installation is available and a compact embedded hook is practical. |
| 3 | J-Bolt | Threaded shank ending in a J-shaped hook embedded in the concrete. | Set in fresh concrete, usually with a positioning template. | Concrete foundations and equipment pads. | Tension and shear for light to substantial attachments when engineered correctly. | Provides mechanical embedment and is useful where a hooked end improves load transfer. | Limited adjustability after placement; the hook must be fully surrounded by sound concrete. | Select for cast-in applications requiring a hooked anchorage and adequate concrete cover. |
| 4 | U-Bolt | U-shaped threaded rod with two threaded legs and a curved bearing section. | Placed around a pipe, cable tray, or member and secured with nuts; may be cast in or used with plates. | Steelwork, concrete supports, pipe racks, and equipment frames. | Clamping and restraint loads; usually not the first choice for high direct tension in concrete. | Excellent for securing round components and distributing clamping pressure over two legs. | Threaded legs can bend under excessive tightening; corrosion protection is important in outdoor service. | Use for pipe support, conduit restraint, cable management, and light equipment fastening. |
| 5 | Expansion Anchor Bolt | Threaded bolt, nut, sleeve or clip, and an expansion mechanism that presses against the hole wall. | Installed into a drilled hole and tightened to activate mechanical expansion. | Sound concrete and, for some designs, solid masonry. | Tension and shear; capacity depends strongly on substrate, embedment, spacing, and edge distance. | Fast installation, immediate loading after tightening, and no curing time. | Expansion pressure may cause cracking or reduced performance near edges and in weak concrete. | Choose for retrofit work in sound concrete when quick mechanical installation is required. |
| 6 | Sleeve Anchor | Threaded stud or bolt combined with an expansion sleeve, nut, and washer. | Inserted into a drilled hole and tightened to expand the sleeve against the substrate. | Concrete, solid brick, and some dense masonry materials. | Light to medium tension and shear loads, subject to approved design data. | Versatile, easy to install, and available in configurations for various fixture thicknesses. | Performance is sensitive to hole cleaning, substrate quality, and proximity to edges. | Select for general-purpose fastening of brackets, rails, guards, and noncritical equipment. |
| 7 | Wedge Anchor | Threaded stud with an integral expansion clip or wedge near the embedded end. | Hammered into a drilled hole and tightened so the wedge engages the concrete. | Cracked or uncracked concrete only when the selected anchor is approved for that condition. | Medium to high tension and shear in structural concrete, based on qualified design values. | Strong mechanical interlock, consistent installation, and immediate load transfer. | Requires suitable concrete thickness, hole depth, cleaning, spacing, and edge distance. | Use for structural retrofit connections and heavy fixtures where approved load data is available. |
| 8 | Concrete Screw Anchor | Hardened threaded fastener with a specialized thread that cuts or forms engagement in a drilled hole. | A pilot hole is drilled, cleaned, and the screw is driven directly into the concrete or masonry. | Concrete, concrete block, and selected masonry substrates. | Light to medium tension and shear loads, depending on diameter and approved application. | Fast, removable, and generally produces low expansion stress in the base material. | The hole must be correctly sized; repeated removal and reuse may reduce thread engagement. | Choose for fast retrofit installation, temporary fixtures, and locations with limited edge distance. |
| 9 | Chemical Anchor Threaded Rod | Threaded rod bonded into a drilled hole with a two-part structural adhesive. | Drill and clean the hole, inject adhesive, insert the rod, and allow the specified curing period. | Concrete, solid masonry, and some hollow substrates with a suitable screen sleeve and approved system. | High tension and shear potential, subject to adhesive qualification, temperature, moisture, and embedment. | Low expansion stress, flexible embedment depth, and good suitability near edges when designed correctly. | Requires careful hole cleaning, temperature control, cure time, and trained installation. | Select for high-load retrofit connections, close edge conditions, or applications requiring deep embedment. |
| 10 | Undercut Anchor | Anchor with an enlarged bearing area formed beneath the surface of the drilled hole. | Installed with a specialized drilling or setting tool that creates a mechanical undercut. | Qualified structural concrete, including certain cracked-concrete applications. | High tension and shear capacity with strong resistance to pullout when properly designed. | Positive bearing action and relatively low surface expansion stress. | Higher installation complexity, specialized tooling, and strict inspection requirements. | Use for demanding structural or overhead connections where high performance and limited expansion are needed. |
