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Full Specification

Type

Concrete Screw (Tapcon)

Diameter

3/8"

Available Lengths

2-1/4", 3", 3-3/4", 4-1/2"

Pilot Hole Diameter

5/16"

Pilot Hole Depth

1-3/4" min

Embedment Depth

1-3/4" minimum

Recommended Torque

60-85 in-lbs

Compatible Substrates

Concrete, Brick, CMU block (solid face), Stone

Load Rating

600-900 lbs (tension), 800-1,200 lbs (shear)

Material

Carbon steel (blue), Stainless steel (silver)

Removable

Yes

Best For

✓Heavy door frames
✓Ledger boards
✓Structural brackets
✓Machinery mounts (light)

Not For

✗Hollow block
✗Cracked concrete
✗High seismic zones without review

How a Tapcon Grips

Tapcon-style concrete screws cut their own threads directly into the base material, which is why the pilot hole is smaller than the screw's nominal diameter: the threads need solid material to bite into. Drill the hole too large and the threads have nothing to grip; too small and the screw strips or snaps during driving.

Installation Tips

1.Use a 5/16" carbide masonry bit — the largest common Tapcon size

2.3/8" Tapcons require more torque — use an impact driver or torque wrench

3.Pre-drill with a rotary hammer for cleaner holes and better thread engagement

4.Space anchors minimum 10× diameter (3-3/4") apart for full rated load

Frequently Asked Questions

What size drill bit does a 3/8" Tapcon need?

Use a 5/16" carbide masonry bit, drilled to 1-3/4" min.

How much weight can a 3/8" Tapcon hold?

600-900 lbs (tension), 800-1,200 lbs (shear). Actual capacity depends on base material strength and embedment — verify against the manufacturer's ICC-ES ESR data for structural work.