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29 Sep , 2025
How to Install Anchor Bolts in Concrete
To install anchor bolts in concrete, mark the layout, drill to the right diameter and depth, clean with brush-and-blow, set the anchor (mechanical, drop-in, epoxy, or cast-in), and tighten to spec.
Doing this right gives you safe, long-lasting connections for base plates, machines, railings, and steel frames—without spin-outs or failures.
Anchor bolts connect a structure or machine to concrete and carry tension and shear. You’ll find both post-installed anchors and cast-in rods:
India note: Designs often reference IS 456 / IS 800. On international projects, you’ll also see ACI 318 anchoring to concrete provisions and ACI 355.2 for anchor qualification.
Use this quick guide to align choice with load and site conditions:
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Benefits: Fast, high capacity; great for steel base plates and handrails/railings.
Best for: Masonry, light–medium loads, sill plate/pergola/gazebo anchors.
Thread the stud/bolt and torque.
Use case: Machinery & equipment anchoring where you want a neat, flush surface.
Why epoxy: Handles cracked concrete, seismic C1/C2, close edge distances, and heavy vibration/dynamic loads (HVAC, solar racking, telecom towers).
Use this planning worksheet during estimating and installation. Values are typical for common products—always follow the manufacturer's datasheet or the engineer’s design.
| Anchor (metric) | Common imperial | Typical drill bit (mech) | Indicative min embedment (hef)* | Typical torque (indicative)** |
|---|---|---|---|---|
| M6 | ~1/4" | 6 mm | 40–50 mm | 6–10 N·m |
| M8 | 5/16" | 8 mm | 55–65 mm | 10–20 N·m |
| M10 | 3/8" | 10 mm | 70–90 mm | 25–40 N·m |
| M12 | 1/2" | 12 mm | 90–110 mm | 40–80 N·m |
| M16 | 5/8" | 16 mm | 110–140 mm | 100–150 N·m |
| M20 | 3/4" | 20 mm | 140–170 mm | 200–300 N·m |
Download Anchor Bolt Sizes PDF
India-specific: Cross-reference IS 456 / IS 800 provisions; ask for IS or ICC-ES/ETA approvals from your supplier.
With over six decades of experience, Ferry International is one of India’s leading anchor bolt manufacturers. From Tronica City, Ghaziabad (U.P.), we supply across Delhi-NCR, India, and international markets. Our range covers M6, M8, M10, M12, M16, M20 in wedge, sleeve, three-leaf/four-leaf shield, brass, drop-in, through bolts, eye hook, and J-hook anchors—serving construction, oil & gas, power plants, and marine.
Need help with embedment & torque selection or bulk pricing? Talk to Ferry International—send your drawing/spec and get a fast, engineered recommendation.
1) What drill bit size matches a 1/2" (M12) wedge anchor?
Use a 12 mm (1/2") bit for most wedge anchors. Always check the product label; some epoxy installs need a slightly larger bit to allow resin around the rod.
2) How deep should anchor bolts be embedded in concrete?
Follow the datasheet hef. A typical guide is 8–12× diameter (e.g., M12 → 96–144 mm), but cracked concrete or high loads may require more.
3) Can I use epoxy anchors in wet holes or overhead?
Yes—if the resin is rated for wet/overhead use. Clean the hole thoroughly, inject from the bottom up, and respect gel and curing times.
4) What torque should I apply to M10/M12 wedge anchors?
Torque varies by brand and approval. As a rough idea, M10 ≈ 25–40 N·m, M12 ≈ 40–80 N·m—check your datasheet for the exact value.
5) Are wedge anchors removable after installation?
No. Once expanded, they are not meant for reuse. If removability matters, consider drop-ins (you can swap studs) or epoxy anchors with removable rods.
6) What’s the minimum edge distance and spacing per ACI 318?
It depends on anchor type, diameter, and cracked/uncracked concrete. Follow the manufacturer’s ACI/ICC-ES tables or your structural engineer’s design.
7) How do I fix a spinning or loose anchor in concrete?
The hole may be oversized or dusty. Re-drill correctly, brush & blow, and reinstall. For repairs, switch to epoxy with sleeves or move the location per design.
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