concrete wedge anchors
Firm wedge lock prevents concrete loosening.
High load strength for structural concrete fix.
Factory precision for long stable anchoring.
Sinsun Factory Direct: Premium Concrete Wedge Anchors for Structural Applications
Shop premium concrete wedge anchors from Sinsun Factory. Our heavy-duty wedge anchor bolts deliver strong tensile strength, vibration resistance and stable mechanical expansion for concrete, masonry and structural fixing. Available in carbon steel & stainless steel, bulk wholesale & custom sizes offered.
Get a Quick QouteSinsun Wedge Anchors: Heavy-Duty Concrete Expansion Fasteners Built to Last
You tap a concrete slab, drill a clean hole, and expect the fastener to hold securely in place. There are few things, however, more frustrating than a wedge anchor slipping or failing under load. This is because the expansion collar failed to seat properly. Sinsun wedge anchors are designed to solve this problem.
The wedge anchors we manufacture are made from solid carbon steel (C1022A) or stainless steel, are heat-treated to exact specifications, and are coated with a corrosion-resistant finish that has been proven in the field.When anchoring structural steel columns or heavy machinery, this batch-to-batch consistency provides direct safety assurance and peace of mind.
Our wedge anchor bolts are available in diameters ranging from 1/4 inch to 1-1/4 inches, with lengths from 1-3/4 inches to 12 inches. The thread length accommodates fastener thicknesses ranging from flush mounting to 5-1/4 inches. You don't have to run to the hardware store if you need replacement parts as each anchor comes with a heavy-duty hex nut and flat steel washer, making it ready to use right out of the box. In addition, we have stamped a length identification code directly onto the end of each anchor bolt.
Wedge anchors, also known as stud anchors, concrete anchors, Kwik-Bolts, Power Studs, Thunderstuds, Trubolt, or Redi Bolt, are a type of mechanical expansion anchor. During installation, it expands to fit a concrete hole that has already been drilled. This anchor is one of the strongest and most popular concrete anchors, specifically designed for heavy-duty applications.
Popular Classifications of Wedge Anchors (By Material, Coating & Application)
Wedge anchors are primarily categorized by their material, coating, and intended service environment. Choosing the right classification is not about price alone—it is about matching the anchor to the conditions it will face for decades.
-
Get a Quick Qoute
Zinc-Plated Wedge Anchors (Electro-Galvanized)
-
Get a Quick Qoute
Galvanized Wedge Anchors
-
Get a Quick Qoute
Stainless Steel Wedge Anchors
| Diameter | Length Range | Stud Length (mm) | Drill Bit Size | Min. Embedment | Material / Finish Options |
| 1/4″ (M6) | 1-3/4″ – 3-1/4″ (45–83 mm) | 70 | 1/4″ (6.35 mm) | 1″ (25 mm) | Zinc, HDG, 304SS, 316SS |
| 5/16″ (M8) | 2″ – 4″ (51–102 mm) | 75 | 5/16″ (7.94 mm) | 1-1/4″ (32 mm) | Zinc, HDG, 304SS |
| 3/8″ (M10) | 2-1/4″ – 7″ (57–178 mm) | 70 / 75 / 90 | 3/8″ (9.53 mm) | 1-1/2″ (38 mm) | Zinc, HDG, 304SS, 316SS |
| 1/2″ (M12) | 2-3/4″ – 12″ (70–305 mm) | 70 / 90 / 100 / 125 / 155 / 180 | 1/2″ (12.7 mm) | 2″ (51 mm) | Zinc, HDG, 304SS, 316SS |
| 5/8″ (M16) | 3-1/2″ – 12″ (89–305 mm) | 90 / 125 | 5/8″ (15.88 mm) | 2-1/2″ (64 mm) | Zinc, HDG, 304SS |
| 3/4″ (M20) | 4-1/4″ – 12″ (108–305 mm) | 130 / 150 | 3/4″ (19.05 mm) | 3″ (76 mm) | Zinc, HDG, 304SS |
| 7/8″ (M22) | 6″ – 12″ (152–305 mm) | — | 7/8″ (22.23 mm) | 3-1/2″ (89 mm) | Zinc, HDG |
| 1″ (M24) | 6″ – 12″ (152–305 mm) | — | 1″ (25.4 mm) | 4″ (102 mm) | Zinc, HDG |
01
Material
C1022A carbon steel (hardened) | A2/A4 stainless steel (304/316)
→
02
Hardness
45–50 HRC for carbon steel; solution-annealed for stainless
→
05
Expansion mechanism
Uniform 360° radial expansion clip for even load distribution
→
06
Included components
Anchor body, expansion clip, heavy-duty hex nut, flat steel washer (pre-assembled)
→
03
Thread type
Continuous machine threads (UNC for imperial, ISO metric for M-series)
→
04
Certifications
ICC-ES, ETA, seismic-rated cracked concrete options available
→
07
Length identification
Alphanumeric codes stamped on anchor ends per industry ANSI standards for easy inspection after installation
→
08
Packaging
Bulk boxes (25–100 pcs per box), carton quantities for contractors and factory orders
→
Structural Steel Column Base Plates
Wedge anchors connect steel columns to concrete foundations. First, holes are drilled into the base slab and anchors are embedded in the cured concrete. Second, according to engineering specifications, the entire structural frame is secured in place. In earthquake-prone areas in particular, it is essential to use anchors certified by the ICC or ETA and suitable for cracked concrete. Anchors with a diameter of 3/4 or 1 inch and an appropriate embedment depth can withstand significant uplift and shear forces. We supply these products to structural steel fabricators. These fabricators require consistent torque values for every anchor in a building, since even a single underperforming fastener can endanger the entire structure.
Handrails, Guardrails, and Safety Barriers
Any installer who has ever installed a handrail knows that wobble is not an option.Life-safety hazards arise from spinning wedge anchors in holes or anchors that lose tension over time.For interior stairs and ramps, zinc-plated anchors are fine.Hot-dipped galvanized or stainless steel is commonly used for outdoor decks, parking structures, and waterfront walkways where corrosion can be accelerated by weather and deicing salts. It is important to get the embedment depth right - embed it too shallowly and the anchor may pull out under load; embed it too deeply and you may hit rebar.We clearly mark our minimum embedment requirements, taking the guesswork out of it.
Heavy Equipment and Machinery Mounting
Industrial machinery generates vibration. Pumps, compressors, generators, stamping presses, they all have to stay right where you put them. Wedge anchors keep industrial equipment aligned and operating safely for decades. 304 or 316 stainless steel is recommended for wet areas, such as food processing plants, to prevent rust contamination. For a typical factory floor, zinc-plated carbon steel is sufficient. Many of our anchors have a fully threaded body, giving you a variety of base plate thicknesses. This means you don’t have to settle for a particular length if the equipment changes.
Parking Structures and Bridge Infrastructure
Parking garages have the wrath of all worlds: heavy vehicle impact, road de-icing salts, constant vibration and freeze-thaw cycling. Here the standard specification is hot-dipped galvanized wedge anchors. Heavy zinc coating resists road salt exposure which eats through electroplated anchors in a single season. We also have seismic-rated anchors for bridge abutments and expansion joints where movement and cracking of concrete is expected. We are the go-to company for civil contractors and cities seeking anchors that will last for decades, not just until the next inspection.
Installation & Selection Guide
The hole diameter needs to be exactly the anchor diameter - no tolerances. A 1/2″ anchor will need a 1/2″ carbide-tipped masonry bit in a hammer drill. It is impossible to drill a clean hole for wedge anchors with a standard rotary drill.
Use a drill that exceeds the required embedment depth to accommodate any dust that might settle at the bottom of the hole. We recommend drilling at least 1/2″ deeper than the anchor penetrates the concrete. Clean the holes thoroughly. Use a wire brush to loosen any debris, then blast with compressed air to blow the debris out or vacuum out all the dust. Dust left in the hole prevents the expansion clip from seating properly against the concrete, which seriously compromises holding values. This step gets skipped on job sites more often than it should—and it is usually why anchors fail.
The minimum embedment is the depth at which the anchor must be embedded in the concrete to develop its rated holding values.
That is 2″ for a 1/2″ anchor. For a 3/4", it is 3″.
Here’s the simple formula to calculate the total anchor length: Fixture thickness + Minimum embedment + Thickness of ball nut and washer.
The nut and washer usually add about the same thickness as the anchor diameter.
For a 1/2” anchor through a 1/2” steel base plate: 1/2” (plate) + 2” (embedment) + 1/2” (nut/washer) = 3” minimum anchor length.
There is no harm in using a longer anchor, it just gives you more usable thread up above the concrete for any future adjustments.
-
01With a hammer drill and a carbide masonry bit of the exact diameter, drill the hole to spec.
-
02Drill 1/2" deeper than the required embedment depth.
-
03Use a wire brush and compressed air or a vacuum to completely clean the hole.
-
04Put the nut and washer on the anchor and turn the nut a few turns to protect the threads while hammering.
Installation Step-by-Step
- Thread the anchor through the fixture and into the hole.
- Drive the anchor with a hammer until the nut and washer touch the fixture surface.
- aTighten the nut with a wrench. Do not use an impact wrench, it can over-torque and spin the anchor. Tighten the nut 3 to 5 turns past finger-tight, or use a calibrated torque wrench to achieve the manufacturer’s recommended value.
Real Customer Feedback
“Installing handrails and bollards in a coastal parking structure. Salt air destroys zinc-plated anchors in a year. I used Sinsun 316 stainless steel wedge anchors for this job. The marine grade material held up to salt exposure perfectly and the threads were clean and consistent on every box. 18 months later, there is no visible corrosion on any anchor heads. Well worth the investment.” Salt air destroys ordinary zinc-plated anchors in a year. I used Sinsun 316 stainless steel wedge anchors for this job. On every box, the marine-grade material held up perfectly to salt exposure, and the threads were clean and consistent. No visible corrosion on anchor heads 18 months later. “A fine investment.”
“Our manufacturing plant recently required us to re-anchor several heavy production machines.. All throughout the facility we used Sinsun 1/2″ zinc plated wedge anchors. The install was easy. The anchors came in clean, sat solid and took the torque specs easily. The nuts spun on without cross threading which is not always the case with cheaper anchors. We will stock these for future maintenance works.”
We constantly deal with high humidity when it comes to outdoor fasteners here. Commercial Building Sinsun Hot Dipped Galvanized Wedge Anchors We used Sinsun hot dipped galvanized wedge anchors for canopy columns. The coating held up through the rainy season with no rust bleeding or staining on the concrete. The anchors arrived with clear labelling and packaging which made for easy inventory control on site. Excellent value at the price point.
Frequently Asked Questions (FAQ)
Q
What is a wedge anchor called in the construction industry?
A: Wedge anchors go by many common names: stud anchor, concrete anchor bolt, wedge anchor bolt, Kwik-Bolt, Power Stud, Thunderstud, Trubolt, Redi Bolt, anchor bolt for concrete, or simply expansion anchor. Different manufacturers have their own brand names, but they all work on the same mechanical expansion principle.
Q
Can I remove a wedge anchor after it is installed?
A: Wedge anchors are considered permanent fasteners. Once expanded, they cannot be removed without damaging the concrete around them. If removal is absolutely necessary, the typical method is to cut the anchor flush with the concrete surface and drill a new hole nearby.
Q
What is the difference between 304 and 316 stainless steel wedge anchors?
A: 304 stainless is the standard for wet environments—sump pits, pool equipment, food processing. 316 stainless adds molybdenum for superior corrosion resistance in saltwater, chemicals, and high-chloride environments. For coastal or marine applications within 10km of saltwater, 316 is the correct choice.
Q
What is the difference between a wedge anchor and a sleeve anchor?
A: Wedge anchors are designed exclusively for solid concrete and offer higher holding values. The expansion clip wedges directly against the concrete. Sleeve anchors work in concrete, brick, and block—they expand a tubular sleeve against the base material. For solid concrete structural applications, wedge anchors deliver superior strength.
Q
Can I use wedge anchors in brick or block?
A: No. Wedge anchors require solid concrete to achieve proper expansion. In brick or block, the expansion pressure can crack the masonry material. For brick or block, use sleeve anchors, Tapcon screws, or specialty masonry anchors instead.
Q
How deep should a wedge anchor be embedded?
A: Minimum embedment varies by diameter: 1/4″ = 1″, 3/8″ = 1-1/2″, 1/2″ = 2″, 5/8″ = 2-1/2″, 3/4″ = 3″. Embedding deeper increases holding values, but stay within the maximum embedment specified by the manufacturer.
Q
How close together can I install wedge anchors?
A: The standard rule is 10 anchor diameters center to center. For a 1/2″ anchor, that is 5″ apart. Placing them closer risks reducing holding values because the pressure cones will intersect and interfere with each other.
Q
What is the minimum edge distance for wedge anchors?
A: The general rule is 5 anchor diameters from any unsupported concrete edge. For a 1/2″ anchor, stay at least 2-1/2″ from the slab edge. Placing anchors too close to the edge risks cracking the concrete under load.
Q
Do I need a torque wrench to install wedge anchors correctly?
A: For critical structural applications, yes, a torque wrench is strongly recommended. Each anchor diameter has a specified torque value—over-tightening can spin the anchor or pull it out; under-tightening does not fully set the expansion clip. For non-critical applications, tightening 3–5 turns past finger-tight with a standard wrench usually works.
Q
How do I identify the length of a wedge anchor after it is installed in concrete?
A: Sinsun wedge anchors have letter codes stamped on the threaded end of every anchor. Each letter corresponds to a specific length range—for example, “F” indicates 4″ to 4-1/2″ overall length. This helps inspectors verify that the correct embedment depth was achieved without pulling out a tape measure.
Q
What size hole do I need to drill for a wedge anchor?
A: The hole diameter must exactly equal the anchor diameter. A 1/2″ anchor requires a 1/2″ carbide-tipped masonry bit. Using a larger hole compromises holding capacity; using a smaller hole can damage the anchor or crack the concrete around it.
Q
Are Sinsun wedge anchors certified for seismic applications?
A: Yes. We offer seismic-rated wedge anchors with ICC-ES and ETA certifications for use in cracked concrete (C20/25 to C50/60 grades). These are required for structural applications in seismic zones, fire sprinkler bracing, and other life-safety installations.
Q
Can I use wedge anchors for overhead ceiling installations?
A: Yes, wedge anchors are among the strongest and most reliable ways to mount heavy overhead items to concrete ceilings. However, the hole must be drilled deep enough, and the dust must be completely removed. For overhead work, some inspectors allow you to skip blowing the hole clean since debris falls out naturally.
Q
Do you offer sample packs before I place a bulk order?
A: Absolutely. We send sample packs of wedge anchors in the diameters and finishes you specify. Test them in your concrete, run them through your installation process, verify the torque values. No obligation—just a chance to confirm the quality before committing to a larger volume.
Q
Do you offer custom lengths for wedge anchors on factory orders?
A: Yes, we do. As a manufacturer, we can produce custom lengths beyond our standard size chart. Minimum order quantities apply. Contact us with your exact specifications, and we will set up a production run.
Q
What is typical lead time for wedge anchor orders?
A: Standard sizes and common finishes (zinc-plated, hot-dipped galvanized) are typically in stock. For 304 and 316 stainless steel, lead time is 7–14 days. Custom lengths require 20–28 days for production plus shipping.
Q
Do you offer seismic certification documentation with your anchors?
A: Yes. For our seismic-rated wedge anchors, we provide ICC-ES ESR reports, ETA certifications, and complete test data upon request. This documentation is essential for projects that require full permitting and building inspection.
Q
Do you offer seismic certification documentation with your anchors?
A: Yes. For our seismic-rated wedge anchors, we provide ICC-ES ESR reports, ETA certifications, and complete test data upon request. This documentation is essential for projects that require full permitting and building inspection.
Ready to secure your concrete anchor supply chain?
01
If you are a structural steel fabricator, a civil contractor, an industrial maintenance professional, or a construction material distributor serving Europe, the UK, Canada, or Australia, we should talk.
02
We manufacture Sinsun concrete wedge anchors in zinc-plated, hot-dipped galvanized, 304 stainless, and 316 stainless steel—direct from our factory to your job site. No middlemen, no quality guesswork, no hidden markups.
03
Send me your specifications—diameters, lengths, finishes, and estimated annual volume—and I will prepare a tiered pricing schedule that beats whatever your current supplier is charging.
Need Help?
Keep In Touch
TO KNOW MORE ABOUT Sinsun, PLEASE CONTACT US！
We are committed to providing you with the best quality service and look forward to communicating with you to solve problems together and bring you a better experience.
our experts will solve them in no time.