Anchors/1/2" Drop-In Anchor

Drop-In Anchor

1/2" Drop-In Anchor

Quick Answer

A 1/2" Drop-In Anchor needs a 5/8" pilot hole, drilled to 1-5/8" minimum, with 2" minimum embedment, torqued to Set with setting tool; 20 ft-lbs max on the bolt.

Pilot Hole

5/8"

Embedment

2" minimum (sits flush with surface)

Torque

Set with setting tool; 20 ft-lbs max on the bolt

Safe Load

776 lbs

Where to Buy

Budget pick

Wensilon Knurled Drop-In Anchor Assortment (Multiple Sizes)

Multiple sizes · 20 or 100-pack · zinc knurled

★ 4.2 (240)

Check price on Amazon

Required tool

Drop-In Anchor Setting Tool (Multiple Thread Sizes)

1/4"-20 to 5/8"-11 · zinc-plated carbon steel

★ 4.7 (64)

Check price on Amazon

As an Amazon Associate, BuildToolHQ earns from qualifying purchases. Specifications are for guidance only — always verify against the anchor manufacturer's ICC-ES ESR report and local building codes.

Full Specification

Type

Drop-In Anchor

Diameter

1/2"

Available Lengths

1-5/16" shell

Pilot Hole Diameter

5/8"

Pilot Hole Depth

1-5/8" minimum

Embedment Depth

2" minimum (sits flush with surface)

Recommended Torque

Set with setting tool; 20 ft-lbs max on the bolt

Compatible Substrates

Solid concrete only

Load Rating

776 lbs tension safe working load — Ultimate: 3,105 lbs tension — Ultimate values in 2000 PSI concrete (Confast). Allowable calculated at the industry-standard 4:1 safety factor. — Confast publishes no shear value for drop-in anchors.

Material

Zinc-plated steel, Stainless steel

Removable

No — permanent installation

Best For

✓Heavy suspended mechanical equipment
✓Structural overhead connections
✓All-thread rod (1/2-13)
✓Industrial pipe hangers

Not For

✗Hollow block
✗Brick
✗Any overhead application without engineer sign-off

How a Drop-In Anchor Grips

A drop-in anchor is an internally threaded steel body that expands when a setting tool drives its internal plug outward against the hole wall. It cannot grip without being set: dropping it in the hole and threading a bolt in is not an installation, which is why the setting tool is a requirement, not an accessory.

Installation Tips

1.Drill a 5/8" hole for a 1/2" drop-in — never use an undersized bit

2.Use a rotary hammer for clean 5/8" holes — required for proper anchor seating

3.The setting tool must bottom out fully — partial setting dramatically reduces capacity

4.For overhead/suspended loads, apply a safety factor of 4:1 minimum

5.Stainless steel versions required in food processing or chemical environments

Frequently Asked Questions

What size drill bit does a 1/2" Drop-In Anchor need?

Use a 5/8" carbide masonry bit, drilled to 1-5/8" minimum.

How much weight can a 1/2" Drop-In Anchor hold?

776 lbs tension safe working load. Actual capacity depends on base material strength and embedment — verify against the manufacturer's ICC-ES ESR data for structural work.