Side-by-Side Comparison
Structural & HVAC
Concrete Anchors vs. Rebar Sizes
Comparing 2 standards across 18 specifications. 18 key differences identified.
Comparing:
Concrete Anchors
Rebar Sizes
Heavy-duty concrete anchors are categorized into mechanical expansion anchors (Wedge and Sleeve), drop-in anchors, and concrete screws (Tapcons), specified by drill bit diameter, minimum embedment depth, and tensile pullout / shear load capacities.
Standard reinforcing steel bar (rebar) sizes under ASTM A615 are designated by number sizes #3 through #18 representing the nominal diameter in eighths of an inch (e.g. #4 rebar = 4/8" = 1/2" / 12.7 mm diameter, weighing 0.668 lb/ft).
Specification Comparison Table
18 Parameters| Parameter / Spec | ||
|---|---|---|
|
Governing Code
|
ACI 318-19 Chapter 17 Anchoring to Concrete / ICC-ES Acceptance Criteria | — |
|
Wedge Anchor Drill Rule
|
Drill bit diameter MUST match nominal anchor diameter (e.g. 1/2" bit for 1/2" wedge anchor) | — |
|
Tapcon Screw Drill Rule
|
Drill bit is 1/16" smaller than screw dia (e.g. 5/32" bit for 3/16" Tapcon; 3/16" bit for 1/4" Tapcon) | — |
|
1/4" × 3-1/4" Wedge Anchor
|
Min Embed: 1.125 in | Tensile: 1,800 lbs | Shear: 1,600 lbs in 4,000 psi concrete | — |
|
3/8" × 3-3/4" Wedge Anchor
|
Min Embed: 1.625 in | Tensile: 3,400 lbs | Shear: 3,200 lbs in 4,000 psi concrete | — |
|
1/2" × 4-1/4" Wedge Anchor
|
Min Embed: 2.250 in | Tensile: 5,600 lbs | Shear: 5,100 lbs in 4,000 psi concrete | — |
|
5/8" × 6" Wedge Anchor
|
Min Embed: 2.750 in | Tensile: 7,800 lbs | Shear: 8,200 lbs in 4,000 psi concrete | — |
|
3/4" × 7" Wedge Anchor
|
Min Embed: 3.250 in | Tensile: 11,200 lbs | Shear: 12,500 lbs in 4,000 psi concrete | — |
|
Substrate Suitability
|
Wedge anchors: Solid poured concrete ONLY (Never use in hollow CMU cinder block or brick) | — |
|
Governing Standards
|
— | ASTM A615 / ASTM A706 (Earthquake grade) / CSA G30.18 |
|
US Numbering System
|
— | Rebar number = diameter in 1/8ths of an inch (e.g. #5 = 5/8" / 15.875 mm) |
|
#3 Rebar (Driveway / Patio Mesh)
|
— | Dia: 0.375 in (9.525 mm) | Area: 0.11 sq in | Weight: 0.376 lb/ft (0.560 kg/m) |
|
#4 Rebar (Residential Footings / Walls)
|
— | Dia: 0.500 in (12.70 mm) | Area: 0.20 sq in | Weight: 0.668 lb/ft (0.994 kg/m) |
|
#5 Rebar (Structural Slabs / Foundation)
|
— | Dia: 0.625 in (15.88 mm) | Area: 0.31 sq in | Weight: 1.043 lb/ft (1.552 kg/m) |
|
#6 Rebar (Retaining Walls / Beams)
|
— | Dia: 0.750 in (19.05 mm) | Area: 0.44 sq in | Weight: 1.502 lb/ft (2.235 kg/m) |
|
#8 Rebar (Commercial Columns)
|
— | Dia: 1.000 in (25.40 mm) | Area: 0.79 sq in | Weight: 2.670 lb/ft (3.973 kg/m) |
|
#18 Rebar (High-Rise Core Columns / Dams)
|
— | Dia: 2.257 in (57.33 mm) | Area: 4.00 sq in | Weight: 13.60 lb/ft (20.24 kg/m) |
|
Standard Steel Grades
|
— | Grade 40 (40 ksi / 280 MPa), Grade 60 (60 ksi / 420 MPa), Grade 75 (75 ksi / 520 MPa) |